JPS61287352A - Packet address addition control method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Summary] When a packet is circulating on a communication path in which a plurality of processing devices (communication devices) are connected in a ring, the present invention measures the size of the communication path. By assigning a unique address to each packet and constantly monitoring the communication path, it is possible to automatically restore the communication path when it is disrupted by disturbance or the like.

[Industrial application field]

The present invention relates to a network system in the field of information processing in which a plurality of processing devices are connected in a ring, and particularly to a method for uniquely assigning addresses to packets circulating on a communication path.

[Conventional technology]

Conventionally, in 7) work systems in which communication devices are connected in a ring, addresses are statically assigned, that is,
Addresses were assigned to packets on the communication path after checking the size of the ring in advance.

[Problem that the invention seeks to solve]

This conventional method has the disadvantage that the reliability of the network system is poor because it cannot be corrected if the address attached to the packet is incorrect due to disturbance or the like.

The present invention has been made in view of the above-mentioned drawbacks, and allows a processing device using a circular communication path to quickly initialize the communication path and recover from a failure (disturbance), thereby improving the performance of a network system. The purpose is to improve reliability.

[Means for solving problems]

The purpose is to provide a counter 25 that subtracts and counts from a preset value to a value set in a number setting means in a network system in which a monitoring device 1 and a plurality of communication devices are connected tangentially via a circular communication path. , the monitoring device is provided with a digitizer 26 for setting the packet address of the packet having the address after it has circulated on the communication path, and a comparator for comparing the address input line and the address output line. This is achieved by a packet address addition dynamic control method.

[Effect]

The present invention provides a method in which a plurality of communication devices are connected via a circular communication path, the same number of packets as the communication devices circulate, and the packet address is statically determined using a fixed address; ■Address input line and address output This method improves the reliability of the system by comparing the lines, and if they do not match, it is assumed that there has been a disturbance and the number of devices is determined again using (2).

〔Example〕

The present invention will be described in detail below with reference to the drawings.

FIG. 1 is a network system configuration diagram showing an embodiment of the present invention.

In the figure, 1 is a monitoring device, 2 is a communication device A, 3 is a communication device B, 4 is a communication device D made by Tsushin ZC15, and 6 is a communication device E.

FIG. 2 is a diagram showing details of the monitoring device 1 according to an embodiment of the present invention.

In the figure, 21 is an address input line, 22 is a comparator, 2
3 is a control unit, 24 is an address output line, 25 is a counter, 2
6 is a digitizer.

FIG. 3 is a diagram showing details of a packet showing an embodiment of the present invention.

Consider a network system that has a circular communication channel that performs transfer.

When the communication path is activated, the addresses 31 of packets on the circular communication path as shown in FIG. 3 are not constant. The control unit 23 of the monitoring device 1 sets the state to the measurement state.

In this measurement state, the address generation subtraction counter 25
starts subtraction counting from the maximum number allowed by the monitoring device (value set when designing the network system). The output of the address generation subtraction counter 25 is sent as is to the circular communication path, and becomes the address 31 of the packet on the circular communication path.

When the value of the subtraction counter 24 becomes O, the address 31 of the packet that circulates and returns to the monitoring device 1 is the size of this communication path (communication devices A2 .
B3. . The value of the address 31 is held in the register 26 as the size of the circular communication path, and from now on, the subtraction counter 25
From then on, the comparator 22 sequentially generates values from 1 smaller than the value held in the digitizer 26 to 0 unless there is a difference between the address input line 21 and the address output line 24.

When a disturbance occurs, if the address 31 of the circulating packet is incorrect due to a disturbance or the like, the address input line 21 and the address output line are compared by the comparator 22, and if they do not match, the controller 23 determines that a disturbance has occurred and sets the Measure the size of the communication path again in the same way.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to initialize a communication channel even when a device using the communication channel does not know the size of the communication channel in advance. Furthermore, even if the packet address on the communication path changes due to disturbance or the like, it can be automatically detected and restored, thereby improving the reliability of the network system.

[Brief explanation of drawings]

FIG. 1 is a network system configuration diagram showing an embodiment of the present invention. FIG. 2 is a diagram showing details of the monitoring device 1 according to an embodiment of the present invention. FIG. 3 is a diagram showing details of bucket 7) showing one embodiment of the present invention. Explanation of symbols: 1 is a monitoring device, 2 is a communication device A, 3 is a communication device B, 4 is a communication device C15 is a communication device D, 6 is a communication device E121 is an address input line, 22 is a comparator, 23 is a control unit , 24 is an address output line, 25 is a counter, and 26 is a digitizer. Tomi 1 (2) 2nd (i2) Figure 3

Claims (1)

[Claims] In a network system in which a plurality of communication devices and monitoring devices are connected via a circular communication path, when the network is activated, a packet address is determined by subtracting and counting from a preset value to a value entered in the number setting means. The monitoring device is provided with a counting means for determining the address, a numbering means for setting the address after the packet having the address has circulated, and a comparing means for comparing the address input line and the address output line. Packet address addition control method.