JPS62108309A - Data link system - Google Patents

Abstract

PURPOSE:To install an input/output unit having a high density by providing a memory for storing the allocating information, on a remote station, inputting optional allocating information from a master station. and executing an allocation. CONSTITUTION:Allocating information of an input/output unit 30 which has allocated the number of points to a slot of a control use RAM 25 is written through a data link use interface 31 from a CPU of a master station. A CPU 13 writes unit address information which has been obtained from its information, to an address designation use RAM 26 through a switching circuit 27. Subsequently, when the CPU 13 executes an access of an input and an output, an address of an address bus 23 is designated, and a prescribed bit value is outputted from the RAM 26, and outputted to an address decoder circuit 29 through a switching circuit 28. The circuit 29 decodes its bit value, outputs a slot selecting signal, and executes an access to an output unit which has been installed to its slot.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a master station including a programmable controller, and a master station connected to the master station via a cable.

The present invention relates to a data link system having a remote station that is a programmable controller.

[Conventional technology]

The conventional data link system, as shown in Figure 6,
The master station 7 and remote station 8 are connected by optical cable.

It is a system connected by a cable 9 such as a coaxial cable, and both the master station 7 and the remote station 8 function as programmable controllers, and can connect a large number of input/output devices. In the master station 7, there is a heating unit 2A, a CPU unit 3A, and an input unit) 4 in the IA.
A etc. are connected. Similarly, to the remote station, the base units) IBjCt source unit 2B,
The second unit 3B for IJ mote is connected, and the input 1 unit and output unit are connected to the other slots. Namely.

The input unit 4B is connected to the +1 slot, and the output unit 5B is connected to the +3 slot.

The output unit 6B is connected to the +4 slot.

The +2 slot is an empty slot with nothing connected to it. Each input or output unit is a 16-point input unit or output unit that can normally connect 16 input/output units, so 16 input units or output units can be connected to the open unit in the future. To.

Sixteen input/output numbers (10 to IF) are automatically assigned.

[Problem that the invention seeks to solve]

In the conventional data link system described above, in recent years, input/output crab units of programmable controllers have become more dense, and input/output crab units with a number of points greater than 16 points, for example, input/output crab units with 32 points or 64 points, have appeared. However, in the past, 16 points were automatically assigned to the open slot of remote station 8, so when the recent high-density input/output crab knit was installed, the subsequent input/output numbers would be shifted. there were.

The present invention was made to solve this problem, and an object of the present invention is to provide a data link system having a remote station to which a high-density input/output crab unit can be attached.

[Means for solving problems]

In the data link system according to the present invention, the remote station has a plurality of slots for connecting a plurality of input/output devices;
The system has an allocation information memory that stores allocation information that determines the number of input/output devices that can be connected to each of these slits, and this allocation information is sent from the master station to the remote station via a cable. It is something.

[Effect]

In the data link system of this invention.

In the remote station, the input/output numbers of the input/output devices are determined by the allocation information stored in the allocation information memory, so that the number of input/output units that have been allocated in advance can be connected to the empty slots.

〔Example〕

The basic configuration of the mass programmable controller is shown in FIG. The programmable controller 10 has an input section 1
1. Output section 12. CPU13. Program storage unit 14.
It is composed of a data storage section 15.1 and a source section 16, and writes a program to this programmable controller 10,
itl! A peripheral device 17 is provided for the purpose of e.g.

The input unit 11 receives AC from an input device (not shown) such as a limit switch or a pushbutton switch.

The signal level that handles DC input signals internally (usually DC5
V-rail), and also has a function of selecting necessary input signals and sending them to the CPU 13 according to instructions from the CPU 13. This input section 11 is also called an input interface.

The output unit 12 holds the calculation results for each output signal from the CPU 13 and amplifies the internal signal level to a level that can drive an output device such as a solenoid valve (not shown). This output section 12 is called an output interface.

The CPU 13 executes the human power section 11 according to the contents of the program.
This is a part that takes in necessary input signals from the input section, performs necessary calculations, and outputs the calculation results to the output section 12. Operations include sequence operations such as serial and parallel connections of contacts, timing, and counting, arithmetic operations such as addition and subtraction, and data processing operations such as numerical data transfer and code conversion. Also, the timer (
(not shown) and a counter (not shown).

The program storage unit 14 is a part that stores programs that are control contents, and the programs are loaded to the CPU 13 and executed. Data storage unit ・15 is a timer,
This is the part that stores counter contents and numerical data. The power supply unit 16 is a part that converts an external power supply into necessary DC power internally. The peripheral device 17 is a program and monitor device for creating programs, writing to and reading from the program storage unit 4, displaying calculation results and input/output signals, and displaying current values of timers and counters.

FIG. 1 shows a remote station of a data link system according to an embodiment of the present invention. In the CPU 13 of the programmable controller which is a remote station.

Control RO via data bus 22 and address bus 23
M24 and control RAM 25 are connected. The addressing RAM 26 stores the input/output crab unit number of each input/output number.

This addressing RAM 26 is connected to the data bus 22 via a switching circuit 27. Also.

An address decoder circuit 29 is connected to the address designating RAM 26 via a switching circuit 28, and this address decoder circuit 29 is connected to the input/output crab unit 30.

The input/output crab unit 30 is connected to the CPU 1 via the data bus 22.
Connected to 3.

The CPU of the master station is connected to the cable, the data link interface 31 of the remote station, the data bus 22. address bus 2
It is connected to the CPU 13 via 3.

Next, the operation will be explained. Remote station ÷ 1 slot
An example will be explained in which a 6-point human crab knit is connected, the φ2 slot is a 32-point open area, and a 16-point output crab knit is connected to the 3 slot.

First, the 1 allocation information is registered in the CPU (not shown) of the master station by the peripheral device (not shown) of the master station.

Next, from the master station CPU to the data link interface 3
1, the input crab unit allocation information as shown in FIG. 2 is written into the control RAM 25. In other words, 16 points (10φ) are assigned to φ1 slot, and 3 points are assigned to ÷2 slot.
2 points (20+) are assigned, and 16 points (1
0φ) is allocated to the control RAM 2.
Add 1 to 5.

The CPU 3 writes unit address information as shown in FIG. 3 into the addressing RAM 26 from the allocation information stored in the control RAM 25. At this time, switching circuit 2
7 is switched to connect the data bus 22 and the addressing RAM 26. The unit address information is stored in bits D3 to D5 of the addressing RAM 26.

Because the φ1 slot is designated with 16 points (10 points).

Address of input/output crab knit 30 (n+oosu) ~ (n+
“00” is written to bits D3 to D5 of OFφ),
Since 2 slots are designated with 32 points (20 points), addresses D3 to D5 of (n+10φ) to (n-1-2F÷)
"01" is written to the bit, and 16 points (10 points) are specified for ÷3 slots, so the address (n+30◆)
"02" is written in bits D3 to D5 of ~(n+3F).

This completes the writing of the 1-allocation information.

Next, the operation when accessing the entry/exit crab knit 30 will be explained. When the CPU 13 accesses input/output number 1, for example, 30, the address bus 23 accesses the address (n+3).
0÷) is specified. When the address (n+30) is specified, the value "02" of the D3 to D5 pits is output from the address designating RAM 26, and as shown in FIG. 4, it is sent to the address decoder circuit 29 via the switching circuit 28. Output. The address decoder circuit 29 decodes the values of bits D3 to D5 and outputs a selection signal for the φ3 slot. As a result, the 16-point output unit installed in the third slot is accessed.

〔Effect of the invention〕

As explained above, the present invention provides a data link system with an allocation information memory that stores allocation information,
Since arbitrary allocation information can be input from the outside, if a large number of points are allocated to the open slots in advance, it has the excellent effect of allowing high-density input/output crab knits to be installed in the open slots. .

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a programmable controller that is a remote station of a data link system according to an embodiment of the present invention, FIG. 2 is a diagram showing a control RAM memory of the programmable controller, and FIG. 3 is a block diagram of the programmable controller. 4 is a diagram showing the switching circuit and address decoder circuit of the programmable controller, FIG. 5 is a block diagram showing the basic configuration of the programmable controller, and FIG. 6 is a diagram showing the conventional data It is a diagram showing a link system. In the figure, 10... programmable controller,
11...Input section, 12...Output section, 13...CP
U. 14...Program storage unit, 15...Data storage unit, 16...Resource source unit, 17...Peripheral equipment, 22...
Data bus, 23...address bus, 24...1 control [I ROM. 25... RAM for control, 26... R for address specification
AM, 27.28...Switching circuit, 29...Address decoder circuit, 30...Input/output crab unit, 31...
This is a data link interface. In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] In a data link system that includes a master station that is a programmable controller and a remote station that is a programmable controller that is connected to the master station via a cable, the remote station has a plurality of slots, and an allocation information memory that stores allocation information that determines the number of input/output devices that can be connected to each slot, and this allocation information is sent from the master station to the remote station via the cable. A data link system that is characterized by