JPS59148908A - Method for displaying operation of sequence circuit - Google Patents

Abstract

PURPOSE:To reduce the transfer volume of data and to improve processing speed by transferring the ON/OFF state signals of I/O points collectively after selecting a sequence circuit monitoring operating state. CONSTITUTION:A sequence operation instruction stored in a sequencer CPU100 is converted into a relay rudder schematic diagram and displayed on a CRT display 108. A shematic diagram convertor 106 stores the positions of displayed relay contacts or the like in a CRT symbol position storing table 120, analyzes which I/O point address in a process I/O device 101 correspods to each relay contact and outputs the analyzed result to the CPU100 through a signal converter 109 or the like. The CPU100 stores the input signal in a storage part 121 and a scanner 122 discriminates the operation in a storage device 123. Every completion of one scanning for the operation of a sequence program, data for one screen of a CRT are continuously and collectively transferred to the shematic diagram converter 106.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a sequence control device, and particularly to a sequence circuit operation display device suitable for online displaying the operating state of an internal circuit of a programmable logic controller.

[Prior art]

Programmable logic controller is relay system (goods)
It is rapidly being used in the field of sequence control because it has features that were not available on the board, such as ease of creating control circuits and ease of changing history.

By the way, one of the features of this programmable logic controller is that it has a rich program debugging function to check whether the created sequence control circuit operates as expected. This converts the machine instructions stored in the memory of the programmable logic controller into a relay circuit diagram image, displays it on the CRT display, and displays the C, )N10FF status of each contact and output coil of the relay circuit. .

Normally, this machine command word to relay circuit converter and C ratio 'I
The display is separated from the programmable controller and rollers, and the R&A light is sent to the corresponding programmable controller when needed, and it can be removed from the programmable controller when it is no longer needed. There is.

In addition, there is a demand for the programmable controller main body and the circuit conversion display section to be used once without being separated over long distances. When trying to control a vast production facility [1ift] with a programmable logic controller, I wanted to install the programmable logic controller as close to the capital of production as possible, that is, in the corner of the production equipment, whereas I
When debugging the 11-car program, set the production setting 1.
This is a case where the circuit conversion display unit is brought to the production equipment operation panel, which is installed in the center of the 7ft area where the entire 7ft can be clearly seen, and the operating status of the sequence circuit created is monitored while operating the production equipment. . For this reason, there are many cases in which a serial interface is used between the programmable logic controller and the circuit conversion display unit to enable long-distance communication.

Connecting the programmable logic controller and circuit conversion display unit using a serial interface slows down the data transfer speed between the two, so contact points generated in the programmable logic controller, ffl force coils, etc. 1N/OFF! The display response time of the operation is slow, and very short pulse-like operations that occur inside the actual programmable logic controller are
The disadvantage is that the circuit conversion display section cannot accurately monitor the circuit.

The reason why the display response time was slow in the conventional device is explained in FIG. The programmable logic controller CPLJloo digitally inputs the status of the field equipment 102 using the process input/output device 101.
Import as. The CPU takes in this signal via the parallel interface path 104'r: and records it in the CPU], performs sequence assurance according to the sequence program shown in C, determines the 0N10FF state of the signal to be output to the outside, and outputs this signal to the outside. ON10FF1g parallel interface path 104, process input/output device it
By transmitting the digital output signal 105 as a digital output signal 105 to the on-site installation 111102 via the on-site installation 111102.

Now, let us consider a case where a circuit conversion display device is connected to the programmable long-circuit controller in order to monitor its input/output status and internal calculation status.

Reference numeral 106 denotes the main body of the circuit conversion device 1 having a built-in microcomputer.
l) Convert it into a rail ladder circuit diagram and send it to the CULT display 108 as bidet No. 1g 107 for display. Now, what about the input/output 0N10FF status? To display d, the serial data 110 is sent via the serial/parallel data 2cm device 1109 to the serial/parallel data converter 111 on the programmable logic controller side.
Perform data communication with.

If you take a closer look at the steps in this display,
Check the 0N10II'F status of the relay symbol,
A flowchart like the one shown in Figure 1-1 and 2 of the stone that displays one chapter of that state as a relay ladder is a) Of f, j'! -&' This is a display that converts the sequence program of the Kogoro Gramabuno L Lower Tsuk controller into a relay ladder circuit diagram, but from the command word of this sequence program, the relay symbol displayed at the top left of the CFtT screen is the programmable logic controller. Then, analyze which human output address the data is imported from. Then, it is determined whether the input/output address of the input/output address corresponding to one core is 0N10FF for the programmable logic controller. This adjustment is normally performed by placing the corresponding input/output address on a serial transfer path provided between the circuit converter +ti 106 and the programmable logic controller.

When the programmable logic controller receives this makeshift input/output address, it takes in from the process input/output device Fi whether the signal at the output point in question is ON or OFF, and sends the answer to the circuit conversion display device. The answer to this question is also the serial transfer path (1+/Z-0 circuit transmitted from C, tJ
On the sword display section, turn ON/01 of this corresponding input/output point.
I=' f station m Based on Shinsugi, the corresponding 1.11/-W in the circuit diagram displayed on the C1,T datesbrae
By changing the point or the pixel of the output section, it is possible to clearly distinguish whether the corresponding circuit element is ON or OFF. A method of displaying the ON/Ol;F state of a circuit is to change the brightness of the corresponding element (
(ON part is high brightness, 022 part is low brightness) 1, 1 ρ thickness (thick line for ON part, thin line for 022 part), method to change the display shape of the relay symbol (for example, adding a dot mark to the ON part) )and so on.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a sequential operation display device using a data transfer method that reduces the display response time of a circuit converter.

[Summary of the invention]

After once displaying a sequence circuit diagram, it is often desirable to monitor the state of the circuit rather than change the circuit itself. In such a case, the present invention is characterized in that only the 0N10FF state signal is transferred, the processing speed is improved, and the jitance circuit is displayed. Specifically, first decide which circuit you want to monitor. Display screen resolution
t can monitor the selected sequence circuit diagram by collectively transferring the 0N10FF status signals of the input/output points for that screen.

[Actual example of investigation]

An embodiment of the present invention will be described below with reference to FIG.

Assume that the CFLT display 108 is now displaying a rail ladder circuit diagram as shown by the solid line. This circuit diagram is a display of sequence commands stored in the sequencer CPU 100O converted into a relay ladder circuit diagram.A CRT is basically a character display and can be displayed horizontally (■ to ■) and vertically. Directions ■ to θ are displayed in blocks.

Now, regarding this sequence circuit diagram, we will discuss the case of monitoring which contacts are ON and which contacts are OFF. The circuit diagram conversion device 106 uses a CRT to determine where on the screen the relay contacts and output coils displayed on the screen are located.
The symbols are stored in the symbol storage table 120. At the same time, it analyzes where the person output point displayed on the CRT display 108 is and which person output point address of the process input/output device 101 corresponds to the serial/
The parallel signal converter 109 converts the signal into a serial signal and sends it to the programmable linear controller 100 via the serial line 110. The programmable logic controller 100 has serial/parallel signal modification [11
After returning to the parallel signal in Step 1, the signal is stored in the turnout point address storage section 121.

When this input/output point address storage is completed, a human output point scanning start signal is transmitted from the circuit diagram conversion device f106 to the programmable logic controller 100 via the serial line 110. Then, the input/output point and address scanner 122 starts operating. In the example shown in FIG.
01 to determine what the actual input/output status of the field device is. This state is then stored in the input/output point data storage section 123. Subsequently, the input/output address scanner retrieves the next point from the input/output address storage section 121. In the example of FIG. 3, the input is 3. and input 3 0N1
The 0FF state is stored in the input/output point data storage section 123. These various procedures are repeated to scan all points registered in the input/output point address storage section 121. At this stage, all the 0N10FF data displayed on the CRT display 1081C has been collected, so the contents stored in the input/output point data storage section 123 are transferred to the serial/) parallel converter 111, serial line 101, serial/ It is transmitted to the circuit diagram converter 106 via the parallel converter 109. This data is then stored in the input/output point data buffer 7125. Once all the data has been stored, the display address 2 kiana 124 starts operating, determines where to display it on C and T from the display address storage section 120, and converts the circuit diagram conversion device +1106 to C i-t'. I” display 108 shows whether the input/output points of the relevant part of the circuit diagram are ON or OFF.
Display whether.

In other words, if the programmable Rontsuk controller 100 constantly scans the attendance point data,
Since the important 7-tance calculation cannot be processed, as shown in Figure 4, every time the /* calculation of the Seedance program completes one scan, the circuit diagram conversion display is performed to continuously display the data for C[1,TllIjii planes. The data is transferred all at once to the device 106.

In other words, in the conventional method, the input/output address was analyzed for each relay symbol, and the individual output address was placed on the serial transfer path as interim data, which took processing time, and the response time to display the 0N10FF status on CR and T was shortened. It was getting long.

However, -11 The input/output of this circuit diagram is 0N101;”F
Once it is decided to display the status, the circuit itself that is being displayed is rarely changed, and only the 0N10FF status of each relay contact or output changes. This means that sending the input/output address (11) every time is a waste of time, so after deciding which circuit's input/output status/ty you want to monitor, configure the circuit only once. All input/output addresses are transferred at once, and thereafter, the data sent from the programmable logic controller to the circuit conversion display device is interpreted at once, including the ON/OFF status of the output points specified at once. I'm going to cut it down, so the amount of data transferred between the programmable Rontsuk controller and the circuit conversion display section can be greatly compressed.
It becomes possible to shorten the display response time of R and T.

When the present invention is put into practice, there is no need to send the conventional Cr (TK optically displayed head address) every time.
If you send only the number of bits equal to the number of input/output points of 106, the transmission data will be reduced to about 1/100, and it will be 0N10Ii'F on the screen.
The display response time has become several tens of minutes, and the human sense has come to completely comply with the manufacturing installation, and even pulse signals can be displayed satisfactorily.

〔Effect of the invention〕

(12) According to Akira, it is possible to reduce the amount of data transmitted between the programmable logic controller and the display device in displaying the operation of the seedance circuit.

[Brief explanation of the drawing]

Figure 1 shows the conventional method of the sequence circuit diagram conversion device, and the second method.
This figure shows a flowchart of the display operation in FIG. 1, FIG. 3 shows a circuit diagram of the display system 1 according to the present invention, and FIG. 4 shows a time chart of sequence calculation and signal transmission. 100...C of programmable logic controller
PU, 101... Process input/output device, 102...
m field IQlj, 104... parallel interface bus, 106... circuit diagram conversion device, 108... CI'
LT display device &, 123... Input/output point data storage (13) Ji 30

Claims (1)

[Claims] 1. In a display control method that includes a programmable logic controller and a display device that displays the status of the sequence control and displays the operating status of a sequence circuit selected from a plurality of sequence system diagrams, point data of the programmable logic controller is provided. After selecting a 7-sequence circuit which stores the state signal of the selected sequence circuit in a storage section and monitors its operating state, only the plurality of point data in the storage section is stored in the operating state display device in a predetermined order. A method for displaying sequence circuit operation, characterized in that the display device stores the transmitted status signal in a point data buffer and displays it as corresponding contact information of a sequence circuit to be monitored and displayed.