JPS60120410A - Sequence controller - Google Patents

Abstract

PURPOSE:To perform characteristic analysis or the like without connecting a control object with a sequence controller by stopping the sequence controller at an optional control step to display sequence information. CONSTITUTION:A sequence controller 101 is connected directly to a plant simulator 300 which simulates the control objects, and they exchange data. This controller 101 is provided with a CPU112 as the center, and programs and data are stored in individual memories 109. A programming support tool 102 which debugs the soft sequence and a CRT104 are connected through a debugging control part 100. The controller 101 is stopped by the start of an optical macro instruction inputted on a keyboard 105 of the programming support tool 102 by address comparing and temporary stop functions, and sequence information are displayed on the CRT104 during this stop time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to the ability to analyze in detail online depacking of sequences in a digital control device using a sequence controller.

[Background of the invention]

BACKGROUND ART Sequence control devices have been widely used in the past to provide outputs to and control objects to be controlled in a predetermined order, and these days, these devices are often implemented using digital computers. Therefore, the sequence control device naturally performs logical operations using a program. From the perspective of a user using this digital control device, it is possible for a general engineer who is familiar with sequence technology to easily modify the sequence processing contents without having any knowledge of sequence controllers or programs. is desirable. For this purpose, a program support device (programming support tool) is added to the digital control device.

This progerabang support tool is a kind of language compiler that converts sequence symbols such as AND and OR keyed in by the operator into a program. At the same time, the sequence symbol corresponding to this program is displayed on the CRT.
(CathodeRay 'l'ul)e). Therefore, the operator can design the logic circuit he/she desires while looking at the logic circuit displayed on CR (1').By keying in the created logic circuit, the program corresponding to this series of logic circuits will be stored in the sequence control device. be done.

Subsequent control of the controlled object is performed based on the new program.

However, the effects of changes to online 4 characteristics and other sequence contents in the controlled object are often easily overlooked when using Depack only on paper.
When the controlled object starts to move, the controlled object itself may be affected due to incorrect changes or overlooked effects.

[Purpose of the invention]

An object of the present invention is to perform online characteristic analysis of a sequence controller without affecting the controlled object in such online depacking.

[Summary of the invention]

In order to achieve this objective, the present invention can program sequences at any control step of the program without connecting the controlled object and the sequence controller.

It is possible to stop the roller and while it is stopped /
- It is characterized by displaying sequence information on C1aT and easily realizing online sequence depacking.

[Embodiments of the invention]

An embodiment of the present invention will be described below.

FIG. 1 is a diagram showing the configuration of the apparatus of the present invention. The Depack system N unit 100 is connected to a sequence controller 101 via a bus A, and is connected to a programming support tool 102 via a transmission line 103. The programming support tool 102 includes a CRT 104 for display, a keyboard 105 for key-in, and a cassette tape (CM/T) 106 as a program input/output medium, for example.

Hiko, 112 and 107 are CPUs, 108 and 109 are memories, 110 is a transmission control unit, and 111 is an input/output device (Ilo
), 113 indicates a plant to be controlled.

FIG. 2 shows the sequence controller 101 shown in FIG.
Examples of sequence logical operations executed in are shown using symbols such as ND and OR.

Incidentally, during programming, etc., the logic circuit shown in the dashed line in FIG. 2 is displayed on the CRT 104 in FIG.

1.2 and 3.9 each indicate on-site contacts to be controlled, and 10 indicates a relay within the plant 113. Also,
The logic circuit inside the dashed-dotted line in the figure is sequence controller 1
01 software processing, and the diagrams outside the dashed-dotted line are constructed using conventional wired logic circuits. For convenience, the logic created by software is represented by symbols 4 to 8.

In this figure, 4, 5.6 represents the timer function, and 4.
and 6 are output 5 seconds and 9 seconds after the input contacts 1.2 close, respectively. 5 outputs at the same time as input contact 2 closes, 5
Output will stop after seconds. 7.8 are AND and OR functions, respectively. P001~P004 or MO01~MOO4
is an incense stick about input and output. Inside the sequence controller 101, a small program (
For example, the keyboard 105 in the programming support tool 102
One macro command is formed by key-inputting the type of symbol (AND, OR, timer, etc.), manual and output incense sticks, and further parameters (time limit in the case of a timer) as a set. By combining the macro instructions, a soft sequence as shown in FIG. 2 is constructed. This will be explained in more detail with reference to FIG.

FIG. 3 shows the memory 10 in the sequence controller 101.
9, ``■'' is a program table, ``■'' is a macro program, ``■'' is a wire number data storage section, ``■'' is a work table data storage section, and ``■'' is a parameter data storage section. IN is an interpreter. The program table I shows macro instructions for each logical function shown in FIG. 2, and stores information about (a) to (e) below for each logical function. The memory contents from (a) to (e) can be arbitrarily rewritten. As will be described later, the macro instructions for the AND function 7 and the OR function 8 do not have a work table address (c) or a parameter address (), but are provided with a plurality of input wire number addresses (b) as necessary. Macro instructions (A) to (E) for each logical function
The contents of each are as follows.

(a) Start address of the macro program ■ that executes the function of the macro instruction itself (AND, OR, timer distinction) (b) Input wire number data (for example, contact 10 for Pool)
The address (c) of the incense stick data storage section ■ that stores the on/off data) The address (c) of the work table data storage section ■ that indicates the location of the work table that counts the timer value) Then 5 seconds.

(9 seconds for timer 6) is stored in the parameter data storage section V. (E) This is the address of the output wire number that outputs the result of the operation, and in the example of Fig. 3, it exists in the incense stick data storage section ■. .

The above information is registered in the program table.

Using this memory content, operations proceed as follows.

First, the interpreter-IN executes the first macro instruction (the fourth
In the example shown, the start address of timer function 4) is read from program table I. This start address indicates the address of the macro program (2), and thereby a macro program is selected according to the type of logical operation (timer-on macro, timer-off macro, AND macro, OR macro, etc.). In the macro program ■, the input wire number or output wire number address (B) or (E), work table address (C), and parameter address in the corresponding macro instruction in the program table I via the interpreter IN. and store m for these
, (2) Perform calculations based on data from v. For example, as an example of the timer function, in 4, the information of the input wire number P001 is "ON" is read from the P1 data of the incense stick data storage section ■, and the time limit of 5 seconds is set from the parameter person of the parameter data storage section ■. read The work table storage section (2) counts the set time of 5 seconds, and when 5 seconds have elapsed, rONJ is written to the M1 data (N) of the incense stick data storage section (2). In this way, software programs are developed centering around the interpreter,
In the past, ordinary engineers could visually confirm the sequence by checking the operation of the contacts, etc., because the sequence was set up using relay logic, and could also grasp the time coordination of the relay operations, etc., but now that it is software, this is no longer possible.

However, as it is always necessary to check time coordination as the sequence progresses, there was a strong desire to visually check this.

FIG. 4 is a diagram showing the coordination of operations in the sequence shown in FIG. 2, in which the horizontal axis shows the elapsed time t, and the axis shows the incense stick data to be visually observed.

C of programming support tool 102 such a diagram
If shown on R, T 104, operators and inspectors can also understand C.
Relay operation information can be obtained by RT, and the validity of the relay coordination sequence can be visually confirmed.

(9) To achieve this, the device wants to investigate the location, for example, the time t when wire number M001 becomes rONJ.

The operation of the sequence controller 101 is temporarily stopped (held) at time t1 when the wire number M002 becomes "off", and desired incense stick data can be investigated during this stop, and the actual plan l- For example, even if the sequence controller 101 is not connected to the
If input contacts 1, 2 and 3 shown in the figure are given in a simulated manner, the validity of the soft sequence can be proved. Furthermore, by inputting this simulated data, it is possible to simulate the input data at the time of plant abnormality and check even the software sequence at the time of abnormality, and it is also possible to eliminate correction errors that are likely to occur when changing software.

The mechanism for temporarily stopping the controller 101, extracting desired data during that time, and displaying it on the CRT will be described in detail below.

As mentioned above, this software program progresses while the interpreter IN recognizes the macro commands serially (10) along the program table (2). Therefore, in order for the controller 101 to recognize the temporary stop location,
The step number of the macro instruction that you want the interpreter to temporarily stop (in the order of the macro instructions that appear in program table I in Figure 3, for example, 0 for the first timer-on macro 4, ■ for the next macro instruction 5, etc.) , actually the supply memory address of the program program with ■ or ■) is specified in advance, and after the interpreter IN finishes executing the macro instruction, it compares the addresses before executing the next macro instruction. 1. If the program table address of the macro instruction to be executed matches the previously specified address, the controller will stop.

This address comparison and temporary stop function allows the controller to be stopped at the beginning of any macro command keyed in using the keyboard 105 of the programming support tool 102.

Figure 5 shows the specific method for realizing these functions (11) FIG.

First, as shown in Figure 1, the sequence controller 10
1 is a plant simulator 300 (
A data input/output device (PIlo) 111 is used in the controller to exchange data with the plant simulator 300. Further, the jitance controller 101 has a CPU 112 as its core, and programs are stored in a memory program 109 (1) and data are stored in a memory data 109 (2).

Further, a programming support tool 102 for depacking a soft sequence and a CRT 104 are connected via a depack control section 100.

Here, the Depack control unit 100 is configured to realize the above-mentioned functions. First, the device is operated by the CPU 200, and its program is stored in the memory 201. Also, a HOLD control unit 202 that stops the CPU 112
, a bus connection control section 203 for bus connection with the sequence controller, and a transmission (12) control section 204 for exchanging data with the support tool 102.

The operation will be explained below.

(2) The operator key-inputs the macro command step number of the software sequence to be stopped using the programming support tool 102 while looking at the display on the CRT 104. The support tool converts this into an address and sends the address information to the Depack control unit 100 via the transmission line TR.
The transmission control unit 204 is notified.

(2) The CPU 200 of the Depack control unit 100 recognizes that address data has been transmitted to the transmission control unit 204 by an interrupt. After this, the sequence controller 101
The HOLD control unit 202 sends a temporary stop request and the address data transmitted from the support tool to the CPU 112 of the CPU 112, and the CPU 112 is also notified of these information by an interrupt and notifies the interpreter IN. When the interpreter receives a stop request while executing the movement shown in FIG.
12 to execute a temporary stop.

(2) When the CPUI 12 stops, it notifies the Depack control unit 1000 and the HOLD control unit 202 that it has stopped.

(2) Since the HOLD control unit 202 finds that the CPU 12 is stopped, it instructs the bus connection control unit 203 to connect the address bus and data bus of the sequence controller 101 to the depack control unit 100.

(2) After confirming that the bus is connected to the sequence controller 101, the HOLIJ control unit 202 gives permission to the CPU 200 to extract data from the sequence controller 101.

■ The CPU 200 is a sequence controller 10.1.
The necessary data is transferred from the memory 109 (2) to the memory 201 of the depack control unit 100.

The HOLD control unit 20 notifies the CPU 200 of the end of the transfer.
Notify 2.

(14) (1) The HOLD control unit 202 instructs the bus connection control unit 203 to disconnect the bus from the sequence controller 101.

■ After the HOLD control unit 202 confirms that the bus has been disconnected,
The CPU 200 is notified of the cancellation of the temporary stop command.

This causes the sequence controller to return to normal operation.

Note that if there is another step that you want to stop, you can issue a temporary stop request and a stop address again at this time.

■TEHAC control ml Data extracted from the OOH sequence controller 101 is transferred from the memory 201 to the transmission control unit 204.

■ Programming tool 10 via transmission line TR
2, the programming tool edits the data and displays it on CR'I'' 104.

Plant data is displayed online on the CRT in the manner described above. An example of this is shown in FIG. 4, which allows you to directly visually confirm the validity of the soft sequence, the discovery of defective areas, and the depacking of corrected areas. In this way, this device was able to have an online sequence stop function by appropriately combining the address comparison function and the temporary stop control function.

〔Effect of the invention〕

According to the present invention, the online sequence depacking device enables online stoppage at any control step in a control device with a sequence controller at its core without being connected to the plant, which is effective for characteristic analysis, maintenance inspection, etc. The CRT display has the effect of making it easy to visually view plant data.

Furthermore, if this mechanism is applied continuously to the same macro command, the passage of time for the same wire number data can be monitored and an online data trend function can also be executed.

[Brief explanation of drawings]

Figure 1 is a block diagram of this online sequence depacking device, Figure 2 is an example of a soft sequence, Figure 3 is a diagram showing the operating mechanism of the software of the sequence controller, Figure 4 is a diagram showing the operating mechanism of the software of the sequence controller. , FIG. 5 is a diagram showing the temporary stop function and operation procedure. Agent Patent attorney Akio Takahashi (17)

Claims (1)

[Claims] 1. In a sequence controller that forms small programs in the macro-instruction format corresponding to logic functions constituting a sequence logic circuit, and realizes processing equivalent to the sequence logic circuit by combining the small programs, the macro-instruction format is A sequence controller that specifies an address of a small program, stops execution of subsequent programs at this address, and displays and outputs input data from the outside or the output status of a logic function of a sequence logic circuit.