JP2000165424A - Loop type data transmitting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the configuration of a slave node by arranging management data transmitting from the master node within a continuous data length section, fetching an address from the head one in order in the slave node and successively executing a setting or monitoring processing under a condition which is set by means of a preceding word. SOLUTION: Various kinds of management data words transmitted from a master node 1 to a slave node are arranged within a continuous data length section from the head address word in the node which indicates the head address of the node to be set or monitored. Then the management data are fetched in order from the head one in the slave node 2 and the setting or monitoring processing is successively executed under the control which is set by the preceding word. Thus, the slave node 2 is not required to have a CPU processor and software for developing management data so that the configuration of the slave node 2 is simplified and the cost is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of management data for setting and monitoring a network constituted by a loop type transmission line, a plurality of node devices provided therein, and various terminals connected thereto, and The present invention relates to a loop-type data transmission device having an improved processing method.

[0002]

2. Description of the Related Art FIG. 15 is a diagram showing a configuration of a conventional loop type data transmission device. In the figure, 510 is a master node, 520 is a slave node, 530 is a master node management device, 541 is a master node processing device, 542 is a slave node processing device, 550 is a terminal attached to each node, and 560 is a terminal attached to each node. This is a transmission path composed of an optical cable.

FIG. 16 is a diagram showing a frame configuration of management data in a conventional loop-type data transmission device. The frame structure of the management data includes a destination node address 601 indicating a node that performs processing of the frame signal, a frame type 602 indicating whether the frame is a frame for which reception processing has been completed, and whether a command is set or monitored. A command code 603 indicates a data length, a data length code 604 indicates a data length, a storage address 605 on which a node address is placed in a node that has performed a receiving process, and data 606 relating to setting information or monitoring information by management data.

Next, the operation of the conventional loop type data transmission device will be described. In the conventional loop-type data transmission device, information of each frame constituting the management data is created by the management device 530, and transmitted to the slave node 5 via the master node 510.
20 and has been expanded and processed by software by a slave node processor 542 having a CPU at each slave node.

[0005]

In the above conventional device, the management data is stored in the master node processing device 5 having a CPU.
41 and the processing device 542 for slave nodes, which are developed and processed by software, there is a problem that the configuration of the slave node 520 is complicated and expensive. An object of the present invention is to solve the above problem and provide a loop-type data transmission device capable of simplifying the configuration of the slave node 520.

[0006]

According to the loop type data transmission apparatus of the present invention, the management data sent from the master node is set in the node indicating the head address for setting or monitoring in the target node for setting or monitoring. It is arranged in a data length section that is continuous with the first address word, and the slave node takes in this management data in order from the first address word in the node, and performs processing for sequential setting or monitoring under the conditions set by the preceding word. I have to. As described above, the configuration is based on the concept of the so-called state machine system in which the processing procedure is performed on the condition of the state transition, so that the configuration of the slave node can be simplified.

Further, a loop type data transmission apparatus according to the present invention includes a master node for sending management data for setting and monitoring a network to a network, and terminals for receiving the management data from the master node and configuring the network. Having a plurality of slave nodes to communicate to the master node and the plurality of slave nodes in a loop, and a transmission line configured using a fiber cable connecting the plurality of slave nodes in a loop. The management data of the network includes a CMD word requesting to perform the setting of the network or to perform reading and monitoring of the state of the network, and which slave node performs the setting or the monitoring process related to the management data. Indicates the address of the slave node A node address word, a head address word in a node indicating a start address of a process to be performed in a designated slave node, a data length word indicating a word length of the management data, and a setting or monitoring for setting or monitoring consisting of a plurality of words. The slave node which indicates the end of the data word and which has been set or monitored by the management data and has its own node address put therein has an end mark word.

[0008] Further, each error control CRC code is arranged for each word constituting the network management data.

Each information word constituting the management data sent from the master node is, for each information word (initial run word), a word formed by inverting the initial run word and each bit constituting the initial run word. (Sequential transmission word) as a set to constitute an inverted two consecutive transmission word, and compare whether the inverted word of the first run word is equal to the continuous transmission word at the slave node to perform error control. ing.

[0010] The structure of the network management data is such that each word constituting the management data and a set of CRC codes provided for the entire management data are provided.

A setting data memory for storing a setting data word of the management data, a parity adding circuit for adding a parity bit to the management data before storing the setting data word, and a parity check circuit for performing a parity check. In preparation for the slave node, a parity bit is added by the parity addition circuit to the setting data word sent from the master node and temporarily stored in the setting data memory, and at the time of reading the setting data word from the setting data memory, A parity check is performed by a parity check circuit, and when an error occurs, a retransmission request is issued to the master node.

A setting data memory for storing a setting data word sent from a master node, and a comparator for comparing the retransmitted setting data word with the setting data word read from the setting data memory in all data areas. In addition, the setting data word sent earlier from the master node is compared with the setting data word retransmitted in all areas, and if they do not match, a retransmission request is issued to the master node.

A plurality of nodes having a function that can be a master node are provided, and priorities are determined based on predetermined rules, and one specific node is set as a master node, and the other is set as a slave node. Management data is exchanged with the node.

In addition, a master node signal composed of priority information and node address information relating to the master node is circulated on a loop transmission path, and a node having a function that can become a master node detects the master node signal. When the priority information of the master node signal is lower than its own priority, the priority order is determined by replacing the priority information of the master node information and the node address information with its own. Also, the configuration is such that the priority information of a node having a function that can be a master node can be changed according to the situation.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a diagram showing a configuration of a loop-type data transmission device according to Embodiment 1 of the present invention. In the figure, 1 is a master node, 2 to 4
Is a slave node. Reference numerals 5 to 8 denote transmission paths configured using optical fiber cables. Reference numeral 9 denotes a network management device which is connected to the master node 1 and performs operations such as network setting, display of monitoring information, and control of management data, and reference numerals 10 to 16 denote terminals connected to the respective nodes. These constitute a loop-type data transmission device, and information is exchanged between the components to function as a network.

FIG. 2 is a diagram showing a configuration of an SDH frame used by the loop type data transmission device. In the figure, 9 bytes-9 lines on the left side indicate SOH, and 261 bytes-9 lines on the right side indicate payload. In the loop type data transmission apparatus according to the present invention, the management data is transmitted using SOH D4 to D12.

FIG. 3 is a diagram showing a frame structure of management data of the loop type data transmission device. As shown in the figure, the configuration items of the management data 101 are a CMD word indicating a request for setting or monitoring (command), 102 is a node address word indicating which node performs processing of this frame, and 103 is a node address word. Is a head address word in the node indicating the head address of the processing performed by the designated node, 104 is a data length word indicating the word length of data, 105 is a data word including a plurality of words for carrying data for setting or monitoring. (# 0 to #n),
Reference numeral 106 denotes an end mark word which indicates the end of the data word and in which the node which has set or monitored puts its own node address. Each word is composed of a flag F (1 bit) 011, which is 1 for a data word and 0 at other times, an information bit (16 bits) 012, and an error control bit (CRC code 8 bits) 013. Consists of bits.

Next, the operation will be described. First, the operation (at the time of transmission) of the master node 1 when setting or monitoring the operation state of the network by an operation from the network management device 9 will be described with reference to FIG. The master node 1 sends out management data composed of each word shown in FIG. First, a case where the CMD word 101 relates to a setting request (write request) will be described. The master node 1 is transmitting the all 1 code in the reset state. When there is a setting (write) request, a write CMD word 101 is transmitted, and then a node address word 102, a head address word 103 in the node, a data length word 104, and # 0 to # of each data word 105
n, and finally the end mark word 106 is sent out. When this transmission ends, the state returns to the reset state, and returns to the transmission state of all 1s. If the CMD word 101 is a monitoring (read) request, the read CMD word 101 is transmitted, and then the node address word 102, the first address word 103 in the node, the data length word 104, the data word 105 of all zeros, and the last End mark word 1
06 is sent out. When this transmission ends, the state returns to the reset state, and returns to the transmission state of all 1s.

Next, the operation of the master node 1 at the time of reception will be described with reference to FIG. In response to the management data sent to the slave node 2, the slave node 2 operates as described with reference to FIGS. 6 and 7, so that the master node 1 generates the master data based on the received signal from the slave node 2. Works to check. First, when a setting (write) request is made in the slave node 2, since the lower 8 bits of the end mark word 106 have been rewritten to the node address word 102 of the node to be set, Is compared with the node address word 102 of FIG. When a monitoring (read) request is made, the monitoring information read from the terminal is sent back on the data word 105, and the lower 8 bits of the end mark word 106 are added to the node address word of the slave node 2. Since it is sent back in place of 102, the contents are confirmed and used as monitoring data. The condition of the state transition is that when there is a 0 signal state when reset to the initial state and then data or a signal other than data arrives (this distinction is determined by the flag F attached to each word) Or check the signal contents other than data. As a countermeasure for abnormalities, C
There are error detection using an RC code, address mismatch detection, timeout detection when a required signal does not come within a predetermined time, and the like. After performing these processes, the process returns to the initial state.

Next, the operation of the slave nodes 2 to 4 will be described. First, an operation corresponding to a case where a setting request is made in the master node will be described with reference to FIG. When the CMD word 101 relating to the setting request (write request) is received, the CMD word is checked together with the CRC code attached thereto, and the write request is detected. Thereafter, the operation in the write mode is started. Next, it is checked whether the node address according to the node address word 102 matches its own node address together with the attached CRC code. If they match, the head address word 103 in the node is checked together with the attached CRC code. Further, the data length word 104 is checked together with the attached CRC code. In addition, data length word 1
The data word 105 corresponding to the data length indicated by reference numeral 04 is checked together with the CRC code attached to each word, and the data setting process (write) based on the data word 105 is performed by the terminal interface (216 in FIG. 8). )
To do it through. And the end mark word 1
When 06 is received, the lower 8 bits are replaced with its own node address, the CRC bit is re-added, the data is transferred to the next node, and the setting process (write mode) is completed. On the other hand, if the node address word 102 does not match its own node address, the setting process is not performed. Also,
If the CRC code attached to the node address word 102 is normal and the end mark word 106 is received within a certain period, the lower 8 bits of the end mark word 106 are transferred as they are. If the end mark word 106 cannot be received for a certain period or more, the error information is set in the register attached to the slave node 2 and the setting process is reset. In both cases where the node address matches or does not match, the master node 1 adds an 8-bit CRC code to each word for each word, so the slave node 2 performs error detection using the CRC code for each word. When an error is detected by any of the CRC codes, error information is set in the register and the setting process is reset.

Next, the operation of the slave nodes 2 to 4 during monitoring (read operation) will be described with reference to FIG.
When receiving the CMD word 101 of the monitoring request (read request), it checks the CRC code attached to the CMD word together and detects the read request. Thereafter, the operation in the read mode is started. Next, it is determined whether the node address word 102 matches its own node address.
Check with RC code. If they match, the head address word 103 in the node is checked together with the attached CRC code. Further, the data length word 104 is checked together with the attached CRC code. Further, the data word 1 for the data length indicated by the data length word 104
The contents of each word (# 0 to #n) are checked together with the attached CRC code one word at a time, and the data word 1 is transmitted via the terminal interface (216 in FIG. 8).
Data read processing (read) is performed based on 05. When the end mark word 106 is received, the lower 8 bits of the end mark word 106 are replaced with its own node address, the CRC code is re-added, the data is transferred to the next node, and the setting process (write mode) is completed. On the other hand, if the node addresses do not match, the monitoring process is not performed. If the CRC code attached to the node address is normal and the end mark word 106 is received within a certain period, the lower 8 bits of the end mark word 106 are transferred as they are. Also,
If the end mark word 106 has not been received for a certain period or more, error information is set in the register and the monitoring process is reset. Regardless of whether the node address matches or does not match, the master node 1 adds an 8-bit CRC code to each word for each word.
An error is detected by the RC code, and when an error is detected by any of the CRC codes, error information is set in the register and the monitoring process is reset.

FIG. 8 is a block diagram of a circuit for performing the processing of the flow shown in FIGS. In the figure, reference numeral 201 denotes a transition condition generation circuit that generates a necessary transition condition of a processing procedure based on a detection result of received data, and 202 denotes an all that captures received data of an all 1 signal indicating that the master node 1 is in a reset state. A check circuit 203 for checking a CRC code added to the received data;
A C check circuit 204 converts the received data arriving in a serial code into a parallel code for internal processing.
A P (serial / parallel) conversion circuit 205, a check circuit for the CMD word 101 included in the received data, 20
6 is a check circuit for a node address word included in the received data, 207 is a check circuit for a flag bit included in the received data, 208 is a check circuit for an end mark word included in the received data, and 209 is a word for each word of the received data. A counter 210, a time-out counter for detecting when the reception data does not arrive within a predetermined time, a data length counter 211 for a data word included in the reception data, an address counter 212 for counting an address word included in the reception data, Reference numeral 213 denotes a CRC adding circuit for changing a CRC code to transmission data sent from the slave node; 214, a P / S (parallel / serial) conversion circuit for converting internal data for parallel processing into a serial code for transmission; The nodoa The gate switching circuit 216 sends out the read data when it matches the address, and sends out the sent signal as it is when it does not match. The gate switching circuit 216 sends the installation information from the master node and the monitoring (read) information from the terminal to the terminal. A terminal interface for exchanging data between The necessary processing is performed by a state transition type procedure called a state machine in which the processing is performed by the next signal under the conditions set by the preceding signal as a whole and configured as described above. As described above, the configuration of the management data sent from the master node 1 is devised so that the processing in the slave node can be performed in a state transition type processing procedure, so that the configuration of the slave node 2 can be simplified. It has become.

As described above, in the first embodiment, various management data words sent from the master node 1 to the slave node 2 are continuously read from the head address word in the node indicating the head address of the node to set or monitor. Are continuously arranged within the specified data length section, and slave node 2
This management data is taken in order from the head address in the node, and the processing for the sequential setting or monitoring is performed under the condition set by the preceding word. Since there is no need to provide software to be developed, there is an effect that the configuration of the slave node 2 can be simplified and cost can be reduced.

Embodiment 2 FIG. In the loop-type data transmission device according to the second embodiment of the present invention, an error correction control method based on the inverted double transmission collation method is applied. In the inverted double continuous transmission collation method, an information word (initial run word) is added with a word (association word) obtained by inverting each information bit thereof, and transmitted. This is a retransmission correction method for comparing whether or not E is equal to each other, and transmitting an error signal back to the master node 1 when there is an error, thereby retransmitting. FIG. 9 is a diagram for explaining a frame configuration of management data to which the inverted double transmission collation method is applied. In the drawing, those denoted by the same reference numerals as those in FIG. 3 indicate those having the same or the same functions as those shown in FIG. The configuration items of each word constituting the management data in this embodiment are the same as those in the first embodiment, but the contents of each word are composed of a first run word and a consecutive run word as shown in FIG. The word has a configuration in which each bit of the first run word is inverted. The initial run word is composed of a flag F which is 1 when data is set and 0 when data is not set, a parity check bit P, and information bits d0 to d15.

As described above, the configuration items of each word constituting the management data are the same as in the first embodiment, and various management data words sent from the master node 1 to the slave node 2 are set or monitored by the slave node 2. The management data is sequentially arranged within the continuous data length section from the start address in the node indicating the start address in the node, and the management data is fetched in order from the start address in the node by the slave node, and sequentially under the condition set by the preceding word. Processing for setting or monitoring is performed. As a result, there is no need to provide a CPU processing device and software for developing management data in each slave node, and the configuration of the slave node can be simplified and the cost can be reduced. In addition, since the inverted two-way transmission matching method is applied as the error control method, the processing circuit can be simplified as compared with the CRC code method that requires buffering of each word and processing based on a generator polynomial. There is.

Embodiment 3 FIG. In the loop data transmission apparatus according to Embodiment 3 of the present invention, CR
The C code is added. FIG. 10 is a diagram illustrating a frame configuration of management data in this case. In the drawing, those denoted by the same reference numerals as those in FIG. 3 indicate those having the same or the same functions as those shown in FIG. The configuration items of the management data in this embodiment are the same as those in the first embodiment. No CRC code is attached to the structure of each word, and one CRC code 10 is commonly used for the entire frame.
7 is attached.

Also in this embodiment, various types of management data sent from the master node 1 to the slave node 2 are stored in a data length section continuous from the head address in the node indicating the head address for setting or monitoring the slave node 2. And the slave node 2 fetches the management data in order from the head address in the node,
Since processing for setting or monitoring is sequentially performed under the conditions set by the preceding word, it is not necessary to provide each slave node 2 with a CPU processing device and software for developing management data. There is an effect that the configuration can be simplified and the cost can be reduced. In addition, since the CRC code is added for each frame instead of the CRC code for each word,
Only 70% of the number of bits is required for one frame, which has the effect of improving transmission efficiency and transmission speed.

Embodiment 4 In the loop data transmission device according to the fourth embodiment of the present invention, error control in which a parity bit is added to setting data in management data is added. FIG. 11 is an explanatory diagram of the operation in this case. In the figure, 1 is a master node and 2 is a slave node. The slave node 2 includes a management data control circuit 21, a setting data memory 22, a parity addition circuit 2,
3. A parity check circuit 24 is provided. At the time of data setting, a parity bit is added from the parity adding circuit 23 to the setting data from the master node 1 and temporarily stored in the data memory 22 together with the setting data. When the setting data is read for use in the node, the parity check circuit 24 performs a parity check, and when an error occurs, requests the master node 1 to retransmit the setting data.

As described above, by adding the error control in which the parity bit is added to the setting data in the management data, an error that cannot be detected by the CRC code can be detected. There is an effect that can be increased. Further, compared with the fifth embodiment in which the whole range of the setting data is compared, it is not necessary to perform the whole range comparison, so that the processing speed can be increased.

Embodiment 5 In the loop data transmission apparatus according to Embodiment 5 of the present invention, the CRC of the management data
In addition to the error control by the code, a function of comparing the setting data of the retransmitted management data with the previously transmitted setting data in all areas is added. FIG.
It is an operation explanatory view in this case. In the figure, 1 is a master node and 2 is a slave node. Slave node 2
Includes a management data control circuit 21 and a setting data memory 2
2. A comparator 25 is provided. At the time of data setting, the setting data from the master node 1 is stored in the setting data memory 22.
Is stored in When the setting data is read from the setting data memory 22, all data areas are compared by the comparator 25, and if they do not match, a retransmission request is issued to the master node 1.

By adding the function of comparing the entire area of the setting data in the management data as described above, an error that cannot be detected by the CRC code can be detected, and the reliability of communication relating to the management data is improved. There is an effect that can be. Further, an additional circuit for parity check required in the fourth embodiment can be reduced.

Embodiment 6 FIG. The loop-type data transmission device according to the sixth embodiment of the present invention includes a plurality of nodes (nodes having the qualifications of the master node) having functions that can be the master node 1 and the slave node 2, and determines the priority among them. It is designed to be operated in advance. FIG. 13 is an explanatory diagram of the operation in this case. In the figure,
Only the nodes 1a, 1b, 1c, and 1d having the qualification of the master node among the nodes provided in the loop transmission path composed of the transmission paths 5, 6, 7, and 8 are shown. These nodes have a priority set to become a master node. A method for determining the master node will be described. In the loop transmission path, priority information and the node address of the node having the priority are circulated as a master node determination signal as needed, and the node having the qualification of the master node detects this master node determination signal and determines its own priority. If the priority information is lower than the priority information, the own priority information and the node address are replaced. By performing this operation on each node having the qualification of the master node, the master node determination signal retains the priority information and the node address of the node having the highest priority at that time, thereby determining the master node. . Assuming that the node 1a has a priority of 1, the node 1b has a priority of 2, the node 1c has a priority of 3, and the node 1d has a priority of 4, the node 1a functions as a master node and the others function as slave nodes by the above control. become. When the relationship between the master node and the slave node is determined, the exchange of management data during this period is performed with the same configuration as described in each of the above embodiments.

[0033] Such a master node determination operation is based on the necessity that the node that has been the master node has to decline the master node due to circumstances. This is performed by transmitting a master node determination signal having its own node address. Also, a node that has a qualification as a master node but declines the master node depending on the situation at that time is reconfigured so that it does not respond to the detection of the master node determination signal. By doing so, there is an effect that the node under the optimum condition becomes the master node and can perform the setting and monitoring of the network according to the situation at each time. Further, as shown in FIG. 14, when a plurality of nodes having the same priority occur, the control is performed such that the node with the lowest node address has priority and becomes the master node. As a result, there is an effect that the node to be the master node can be reliably determined among the set small priorities. As described above, by providing a plurality of nodes that can be both the master node and the slave node, and prioritizing the nodes for operation, the flexibility of network management can be enhanced.

[0034]

According to the loop type data transmission apparatus of the present invention, the management data transmitted from the master node to the slave node is a continuous data length section from the head address in the node indicating the head address of the slave node for setting or monitoring. And the slave node takes in this management data in order from the first address in the node,
Since the processing for the sequential setting or monitoring is performed sequentially under the condition set by the preceding word, the processing procedure in the slave node can be performed by the so-called state machine method, which has the effect of simplifying the configuration.

The network management data exchanged between the master node and the slave node includes a CMD word for setting and monitoring the status of the network and a setting or monitoring process related to the management data. A setting consisting of a node address word indicating the address of the slave node to be performed, an in-node address word indicating the start address of the processing of the designated slave node, a data length word indicating the word length of the management data, and a plurality of words Alternatively, the slave node is configured to include a data word for monitoring and an end mark word that indicates the end of the data word and that the slave node that has set or monitored by the management data carries its own node address. The processing in Carried out by state machine method, the effect of attained the simplification of the configuration of the slave node 2.

Further, since the error control CRC code is arranged for each word constituting the network management data, error control can be performed for each word, and the configuration of the slave node can be simplified. effective.

Each information word constituting the management data sent from the master node is, for each information word (initial run word), a word formed by inverting the initial run word and each bit constituting the initial run word ( (Sequential transmission word) as a set to constitute an inverted two consecutive transmission word, and compare whether the inverted word of the first run word is equal to the continuous transmission word at the slave node to perform error control. Therefore, there is an effect that the configuration of the slave node can be simplified and the cost can be reduced. In addition, CR which requires buffering of each word and processing based on a generator polynomial
There is an effect that the processing circuit can be simplified as compared with the C coding method.

Further, since the configuration of the network management data is such that each word constituting the management data and a set of CRC codes provided for the entire management data are provided, a CRC code is added for each word. Compared to the conventional one, the number of bits per frame is about 70%, which is advantageous in that the transmission efficiency and the transmission speed can be improved.

A setting data memory for storing a setting data word of the management data, a parity adding circuit for adding a parity bit to the management data before storing the setting data word, and a parity check circuit for performing a parity check. In preparation for the slave node, a parity bit is added by the parity addition circuit to the setting data word sent from the master node and temporarily stored in the setting data memory, and at the time of reading the setting data word from the setting data memory, Since parity check is performed by the parity check circuit,
An error that could not be detected by the CRC code can also be detected, and there is an effect that the reliability of communication relating to management data can be improved.

A setting data memory for storing the setting data word sent from the master node is provided in the slave node, and the retransmitted setting data word and the setting data word read from the setting data memory are compared in the entire data area. Therefore, an error that cannot be detected by the CRC code can be detected, and there is an effect that the reliability of communication relating to management data can be improved.

A plurality of nodes having a function that can be a master node are provided, and priorities are determined based on predetermined rules, and one specific node is set as a master node, and the others are set as slave nodes. Since management data is exchanged between nodes,
This has the effect of increasing the flexibility of network operation.

Further, a master node signal composed of the priority information and the node address information relating to the master node is circulated on the loop transmission path, and a node having a function that can become a master node detects the master node signal. When the priority information of the master node signal is lower than its own priority, the priority order is determined by replacing the priority information of the master node information and the node address with its own. Nodes can be easily replaced, and this has the effect of increasing the flexibility of network operation.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a loop-type data transmission device according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating a configuration of an SDH frame used in a loop-type data transmission device.

FIG. 3 is a diagram showing a frame configuration of management data in the loop-type data transmission device according to the present invention.

FIG. 4 is a diagram illustrating an operation flow at the time of transmission of a master node when performing setting or monitoring control.

FIG. 5 is a diagram illustrating an operation flow at the time of reception of a master node when performing setting or monitoring control.

FIG. 6 is a diagram illustrating an operation flow of the slave nodes 2 to 4 when performing setting control (write operation).

FIG. 7 is a diagram illustrating an operation flow of the slave nodes 2 to 4 when performing monitoring control (read operation).

8 is a diagram showing a circuit block that performs processing of the operation flow shown in FIGS. 6 and 7. FIG.

FIG. 9 is a diagram showing a frame configuration of management data applied to the third embodiment of the present invention.

FIG. 10 is a diagram showing a frame configuration of management data applied to Embodiment 4 of the present invention.

FIG. 11 is an operation explanatory diagram related to error control performed by adding a parity bit to setting data applied to the fourth embodiment of the present invention;

FIG. 12 is an operation explanatory diagram relating to error control for comparing all areas of setting data provided in addition to error control by CRC of management data applied to the fifth embodiment of the present invention;

FIG. 13 is a description of a loop-type data transmission apparatus according to a sixth embodiment of the present invention, which includes a plurality of nodes that can be master nodes and slave nodes, and determines and operates the priority of the master node among them; FIG.

FIG. 14 is a diagram illustrating an example of a priority determination method when a plurality of nodes having the same priority occur.

FIG. 15 is a diagram showing a configuration of a conventional loop-type data transmission device.

FIG. 16 is a diagram showing a frame configuration of management data in a conventional loop-type data transmission device.

[Explanation of symbols]

1, 1a, 1b, 1c, 1d Master node, 2-4
Slave node, 21 management data control circuit, 22
Setting data memory, 23 parity addition circuit, 2
4 parity check circuits, 25 comparators,
5-8 transmission line, 9 network management device, 10
16 terminal, 101 CMD word, 102 node address word, 103 node start address word, 104 data length word, 105 data word, 106 end mark word, 107 CRC code word, 011 flag, 012 information bit, 0
13 CRC bit 014 Inverted parity bit, 015
Information bit inverted bit, 201 transition condition generation circuit, 202 ALL1 check circuit, 203 CRC
Check circuit, 204 S / P (serial / parallel)
Conversion circuit, 205 Command check circuit, 206
Node address check circuit, 207 flag check circuit, 208 end mark check circuit, 209 word counter, 210 timeout counter, 21
1 data length counter, 212 address counter,
213 CRC addition circuit, 214 P / S (parallel /
Serial) conversion circuit, 215 gate switching circuit, 216 terminal interface.

Claims (10)

[Claims] 1. A master node for sending management data for setting and monitoring a network to a network, a plurality of slave nodes receiving the management data from the master node and transmitting the management data to terminals constituting the network, and the master node And a transmission line configured using a fiber cable connecting the plurality of slave nodes in a loop, wherein the management data sent from the master node is set or monitored in a target node to be set or monitored. Is arranged in a data length section that is continuous with the head address word in the node indicating the head address to perform, and the slave node takes in the management data arranged in a section length that is continuous from the head address word, and is set by the preceding word. Continue to the preceding word under conditions A loop-type data transmission device for performing processing for setting or monitoring using a continuation word. 2. A master node for sending management data for setting and monitoring a network to a network, a plurality of slave nodes receiving the management data from the master node and transmitting the management data to terminals constituting the network, and the master node And a transmission line configured by using a fiber cable connecting the plurality of slave nodes in a loop, wherein the network management data exchanged between the master node and the slave nodes includes: A CMD word requesting to perform setting or reading and monitoring the state of the network, a node address word indicating an address of the slave node as to which slave node performs setting or monitoring processing related to the management data, Specified slave node A head address word in a node indicating a start address of a process to be performed in a node, a data length word indicating a word length of the management data, a data word for setting or monitoring including a plurality of words, and a data word of a data word. A loop-type data transmission device, characterized in that the slave node, which indicates the end and has been set or monitored by the management data, comprises an end mark word on which its own node address is placed. 3. The loop-type data transmission device according to claim 2, wherein each error control CRC code is arranged for each word constituting the network management data. 4. Each information word constituting management data sent from the master node is an information word (initial run word).
Each time, an initial run word and a word (continuously transmitted word) formed by inverting each bit constituting the initial run word are set to form an inverted double continuous word, and the slave node inverts the initial run word. 3. The loop-type data transmission device according to claim 2, wherein error control is performed by comparing whether or not the successive transmission word is equal to the continuous transmission word. 5. The loop-type management system according to claim 2, wherein the configuration of the management data of the network includes each word constituting the management data and a set of CRC codes provided for the entire management data. Data transmission device. 6. A setting data memory for storing a setting data word of management data, a parity adding circuit for adding a parity bit to the management data before storing the setting data word, and a parity check circuit for performing a parity check. In preparation for the slave node, a parity bit is added by the parity addition circuit to the setting data word sent from the master node and temporarily stored in the setting data memory, and at the time of reading the setting data word from the setting data memory, 3. The loop-type data transmission device according to claim 2, wherein a parity check is performed by a parity check circuit, and when an error occurs, a retransmission request is issued to the master node. 7. A setting data memory for storing a setting data word sent from a master node, and a comparator for comparing a retransmitted setting data word with a setting data word read from the setting data memory in an entire data area. Wherein the setting data word sent earlier from the master node and the setting data word retransmitted are compared in all areas, and if they do not match, a retransmission request is issued to the master node. Item 3. A loop-type data transmission device according to item 2. 8. A master node having a plurality of nodes each having a function that can be a master node, determining a priority based on a predetermined procedure, and setting one specific node as a master node and the other as a slave node, and a master node and a slave 3. The loop-type data transmission device according to claim 2, wherein network management data is exchanged with the node. 9. A function for sending a master node signal composed of priority information and node address information related to a master node to a loop transmission path, as needed, to a node having a function that can function as a master node; A function of detecting the master node signal sent from the server, and a function of replacing the priority information of the master node information and the node address information with its own when the priority information of the master node signal is lower than its own priority. 9. The loop-type data transmission device according to claim 8, wherein control is performed such that a node having a higher priority becomes a master node. 10. The loop-type data transmission device according to claim 8, wherein priority information of a node having a function that can be a master node can be changed according to a situation.