JPS6375850A - System for confirming attribute of card - Google Patents

Abstract

PURPOSE:To facilitate extending a system by providing each card with a port assigning circuit and an attribute information output means and accessing assigned ports by the system to output attribute information. CONSTITUTION:A slot bus 2 of the system and a card function circuit 10 of an extended card 4 are connected by a control bus 11, an address bus 12, and a data bus 13, and a variable decoder 14 is provided on the bus 12, and a card information output part 16 is provided on the bus 13. The port range of the card 4 is preliminarily set in the decoder 14, and the port address of the card 4 designated through the bus 2 is compared with the port range set in the decoder 14; and if they coincide with each other, a control line 15 is activated to output card information from the output part 16 to the bus 2.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a system for checking the attributes of a card having functions such as input/output information.

(Prior art) Conventionally, in the automatic control of various industrial equipment using microcomputers, it is important to check the mounting status and input/output status of peripheral devices, etc. in system control, especially in systems with expandability. , it is necessary to recognize the expanded content before performing actual control. Conventionally, as this type of recognition method, for example,
No. 201461 proposes a method in which an adapter is provided for each peripheral device, and the system recognizes the mounting state of each peripheral device via this adapter.

(Problem to be Solved by the Invention) However, in the system configuration recognition method for such a system configuration, a part of the connector terminal attached to each adapter is used for address setting, and furthermore, this address setting terminal is Since the address number corresponding to the peripheral device is fixedly set, once the address is set, no device other than the peripheral device corresponding to the address can be connected. For this reason, it is necessary to manufacture separate adapters for each peripheral device to be connected, which poses a problem in that it is inconvenient for the user to arbitrarily expand the system.

(Means for Solving the Problems) The present invention provides a system equipped with a card mounting slot into which a plurality of cards having functions such as input/output information can be mounted, in which each card has a system installed at each card mounting position. and a means for outputting attribute information of the card, and the attribute information is output when the system accesses the allocated port. .

(Function) A port range of input/output ports is assigned in advance to each card mounting position by the system.

To install a card, settings are made using a port allocation circuit provided on the card, such as a dip switch. For example, when the system is powered on, it sequentially accesses each card mounting position and sequentially reads the attribute information set on the card mounted in each card mounting position. Thereby, the system recognizes attributes such as the type and number of cards.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

The card attribute confirmation system according to this example is applied to automatic control of a plastic extrusion molding machine and a molding line.

FIG. 1 shows a control main body part 1 of this automatic control device. This control main body part 11 controls the starting operation, steady operation, etc. of the extrusion molding machine and the molding line, and is composed of a microcomputer. It is equipped with a multitasking operating system in ROM. This control main unit 1 is provided with a slot 9 into which a CPU card 3 and an expansion card 4 having functions such as various input/output information are installed. Information exchange between these slots 9 is carried out via a slot bus 2.
The bus configuration is as follows. The expansion card 4 is configured such that the number of cards can be expanded arbitrarily depending on the number of input/output (Ilo) points of the user. Although the drawing shows the control main unit 10 in an open state, the lid 5 is provided with a keyboard 6, and control conditions etc. set and input using the keyboard 6 are displayed on the CRTT. Reference numeral 8 indicates a power source for driving each element within the control main body section 1.

FIG. 2 is a block diagram showing an example of the connection between the expansion card 4 and the slot bus 2. As shown in FIG.

The slot bus 2 and the card function circuit 10 wired on the expansion card 4 are connected by an I10 bus consisting of a control bus 11, an address bus 12, and a data bus 13. In particular, the expansion card 4 according to the present invention
A variable decoder 14 is provided on the address bus 12, and when the port address of the expansion card 4 is specified via the slot bus 2, the variable decoder 14
4 is compared with the port range of the expansion card 4 set in advance, and if they match, the control line 15 is activated,
The card information is sent from the card information output unit 16 to the data bus 3.
output to slot bus 2 via. The data bus 13 is used for inputting data sent from the CPU of this system via the slot bus 2 to the card function circuit 10, and for outputting card attribute information from the card information output section 16. A signal line 17 created based on the signal of the control bus 11 is used as a control signal for switching. This signal line 17 is activated at the time of an interrupt or when the power is turned on, and outputs data on the I10 side to the slot bus 2 at this time.

FIG. 3 is a circuit diagram specifically showing the variable decoder 14, card information output section 16, etc. in FIG. 2.

In FIG. 3, address bus 12 and data bus 13
The data activated is taken in via bidirectional data bus buffers 20 and 21, respectively. The upper three bits (A1, A2, and A3) that are the output of the bidirectional data bus buffer 20 are input to one terminal of EX-OR gates 23a to 23c, respectively. This E
The other terminals of the X-OR gates 23a to 23c are
A dip switch 22 is connected. This DIP switch 22 is a switch element for allocating a port range previously assigned to each slot by the system, for example, I1 from OH to 2CH to the expansion card 4.
When the 0 port is assigned, the DIP switch 22 sets (010), and when the system is assigned I10 ports from 2D H to 4CH, it sets (100). . That is, the maximum port address in the port range assigned to each slot bus 2 is set in bits by this ditub switch 22. The set port range becomes the assigned ports of this expansion card 4. As a result, the outputs of the EX-OR gates 23a to 23c are transmitted to the three-person car 8 through the NAND gate 24 and the EX-OR gate 25a when a port address is specified by the system.
The input of the G2A terminal of the output type decoder 26 is changed. Furthermore, in the circuit configuration of this example, the system accesses the expansion card 4 by accessing the lower number 5 in the allocated port range, and for this purpose, the bidirectional data bus buffer 20 is Lower 3 bits (
A6. A7. A8) is connected to the input terminal of the decoder 26.

Therefore, for example, when the 27H address is accessed for the expansion card 4 assigned up to 2CH, the Y7 terminal of the decoder 26 falls to the rLJ level, so the E
The control line 15 is activated via the X-OR gate 25b, and the tri-state buffer 27 is made conductive. This tri-state buffer 27 outputs the card attributes as bit information; for example, the lowest bit is "L".
When the other bits are at the "H" level, this indicates that the expansion card 4 is a communication card and the number of channels is 2, and only the lower second bit is at the "L" level. Indicates that the card is an analog input card (for example, inputting temperature data measured with a thermocouple) or an analog output card (for example, outputting voltage or current to be controlled), and that the number of channels is 16. Also, when only the lower third bit is at rLJ level, it indicates that the card is a digital input card (for example, relay contact input) and a digital output card (for example, relay output), and that the number of channels is 32. . Such card information is stored in the system in advance, and the system recognizes the card information based on the bit information in the tristate buffer 27.

Note that the fetch clock π is input to the 01 terminal of the decoder 26, and the 10RQ signal is input to the G2B terminal, respectively, to the output of the control bus 11 and the CTC (CTC).
It is input by combining the outputs from the timer C1rcuit).

FIG. 4 is a flowchart showing the operating procedure of the system.

In this flowchart, all card information is first collected when the power of the entire system is turned on.

After confirming that the power has been turned on in step (2), the system starts processing slot 1, which is the first slot into which the expansion card 4 is installed (step (2)). Then, input the port address previously assigned to the slot in step ①, and set the bottom five port addresses of the port range determined by this port address to the slot bus.
2 to the address bus 12 of the expansion card 4.

When this port address matches the setting value set by the DIP switch 22 in the expansion card 4, card information is outputted from the tri-state buffer 27 of the expansion card 4. The system receives this information and sets the card type, maximum number of channels, and number of cards (step ■). In step (2), the slot number is updated in order to process the next slot, ie, slot number 2, and the operations of steps (2) and (2) described above are repeated. When all the card information expanded in step ■ is collected, this information is passed to the control program,
The system uses this information to improve system scalability.
w and executes the system's original automatic control processing program.

(Effects of the Invention) As described above, according to the present invention, each card is provided with a port assignment circuit that can be arbitrarily set and a means for outputting card attributes. Simply insert the card and the system will get the extended card information. Additionally, the system will automatically
Since the attributes of the card and its port address can be known, the expandability of the system is greatly improved.

[Brief explanation of the drawing]

Fig. 1 is a perspective view illustrating the case where the card attribute confirmation system according to the present invention is used as a control main body of a plastic extrusion molding machine and a molding line; Fig. 2 is a block diagram showing the internal structure of the card; FIG. 3 is a circuit diagram showing the connection relationship between the variable decoder and the card information output section, and FIG. 4 is a flowchart showing the confirmation procedure performed by the system. 2...Slot bus 3...CPU card 4.
...Expansion card 9...Slot (card slot) 11...Control bus 12...Address bus 13...Data bus 14
...Variable decoder 16...Card information output section 2
7... Tri-state buffer patent applicant Sekisui Chemical Co., Ltd. Representative Hiroshi 1) Kaoru Figure 7 Figure 2

Claims (1)

[Claims] 1) In a system equipped with a card slot into which a plurality of cards having functions such as input/output information can be inserted, each card has a port range assigned to each card mounting position by the system. A port allocation circuit for setting a port as an allocated port, and a means for outputting attribute information of the card, the attribute information being output by accessing the allocated port by the system. system. 2) The card attribute confirmation system according to claim 1, wherein the port allocation circuit is constituted by a switch.