JPH0373001B2 - - Google Patents

Description

Detailed Description of the Invention The present invention is based on the element numbers of a plurality of conditional elements related to the on/off of a specified output element, the on/off states of these conditional elements, or the logical operation results after testing each conditional element ( The status display device of the sequence controller is designed to display information (hereinafter referred to as status information) for each condition element in order, and more specifically, a display that displays element numbers and status information in order to make the device more compact. The present invention relates to a status display device that has only one set of containers and that sequentially switches and displays element numbers and status information of a plurality of condition elements.

Conventionally, in the above-mentioned status display device,
When a search command is issued by specifying the element number of an output element, the memory address where the output command related to the specified output element was stored is detected, this is used as the initial read address, and display change commands are given from then on. The read address is changed in order at each time, and multiple logic operation instructions programmed before the output instruction are read out in order, and each time a new logic operation instruction is read, the element number and state information of the conditional element are detected. and display it. However, in this case, the above-mentioned display is simply performed by sequentially reading out a group of instructions consisting of an output instruction related to the on/off of an output element programmed before the output instruction and a logic operation instruction regarding a conditional element related to this output element. Because I am just trying to do it,
After the display of the status information of the plurality of condition elements is completed, based on the logical operation instruction programmed at the beginning of a group of instructions consisting of an output instruction regarding the commanded output element and a logical operation instruction regarding the condition element related to this output instruction. If a display change command is given while the above display is being performed, there is a problem in that the output command programmed in the previous group of commands is read out and the display is performed based on this.

For this reason, in conventional devices, each time a new element number is displayed, the command displayed together with the element number is monitored to determine whether the output command programmed at the end of the previous group of commands has been read. It is necessary to determine that the monitoring of the condition element related to the on/off of the specified output element has been completed, and even if you want to see the status information of the condition element related to the specified output element again, It is necessary to set the element number of the output element anew and search for the output command related to this, which has the drawback that monitoring the status information is troublesome.

In view of these conventional problems, the present invention solves the above problems by cyclically displaying the state information of a plurality of conditional elements related to the on/off of specified output elements. The explanation will be based on.

In FIG. 1, 10 is a sequence memory 1
1. A sequence controller consisting of an arithmetic processing section 12, an input section 13, and an output section 14. The memory 11 stores logic operation instructions (TNA, TFA, TNO,
A sequence program is written using TFO, TNE, TFE), output command (YON), etc. Each storage address of the sequence memory 11 has a storage area of a predetermined bit, and one unit of sequence data consisting of an instruction part and an operand part is stored at each address. Note that if the programmed instruction is a logical operation instruction that is an output instruction, the element numbers (input/output addresses) of the conditional element and the output element are programmed into the operand section.

The sequence program stored in the sequence memory 11 is sequentially read out by the arithmetic processing section 12, and input/output elements connected to the input/output section are sequentially selected based on the data in the operand section. If the read sequence program is a logical operation instruction, the arithmetic processing unit 12 reads the on/off state of the selected input/output element as a condition element and performs a logical operation; is activated and deactivated based on the calculation result. In addition, when the arithmetic processing unit 12 is given an interrupt signal INS from the outside, it temporarily stops reading and executing the sequence program, outputs the sequence program at the address specified from the outside, or outputs the sequence program at the address specified from the outside. It has a function to output on/off status.

On the other hand, 20 is a status display device that displays the status of conditional elements related to the on/off of specified output elements, and is composed of an arithmetic processing unit 21, a memory 22, an operation display panel 23, and signal lines SL1 to SL4 and an interface 24. It is connected to the sequence controller 10 via.

The operation display panel 23 is provided with numeric keys 30 for setting output element numbers, a search command key 31, and a display change command key 32. By operating these keys, the processing of the main routine shown in FIG. 8 is executed. executed. That is, in the main routine, first, in step (100), flags for storing the operating states of various keys are initialized, and then, in step (101), it is determined whether or not a key has been operated. If there is a key operation, step (102) will return the numeric key 3.
It is determined whether the operation is 0 or not, and if YES, the process proceeds to step (103), where a numerical value input process is performed using a well-known method. If the answer is NO, it is determined in step (104) that it is another operation key, and the process proceeds to step (105), where the subroutine shown in FIG. 2 is executed.

If it is desired to monitor the state of a conditional element related to the on/off state of a particular output element, first the element number of the output element is set using the numerical keys 30, and then the search command key 31 is operated.

As a result, the arithmetic processing unit 21 searches for a group of instructions consisting of an output instruction related to the element number set by the numerical key 30 and a logical operation instruction related to this output instruction, and then searches for the element number of the set output element. Display on/off status.

That is, when the search command key 31 is operated,
The arithmetic processing unit 21 executes the processing routine shown in FIG. 2, and when the search command key 31 is operated as in this case, this is determined in step (40) and the process proceeds to step (41). A group of instructions consisting of an output instruction related to the set output element and a logical operation instruction related to this output instruction is searched. FIG. 3 shows the details of this search processing routine PSR. In this routine, ROC represents a read counter that specifies the read address for reading the sequence program from the sequence memory 11 of the sequence controller 10, and APC represents the read counter that specifies the read address for reading the sequence program from the sequence memory 11 of the sequence controller 10. The programs are stored in a buffer area BUA provided in the memory 22 in the order of the programs. When this operation is completed, the address designation counter APC has designated the address in the buffer area BUA where the output command was written. Therefore, for example, in order to monitor the states of conditional elements C1 to C3 related to on/off of output element 01 of the relay circuit shown in FIG. 4, the element number (input/output address) of output element 01 is
When the search command key 31 is operated after setting , the sequence program corresponding to the above-mentioned relay circuit is searched from the sequence memory 11, and this is stored in the buffer area BUA after the first address BUAO as shown in FIG. . Since the output instruction program YON100 is programmed at the end of the searched sequence program, it is always located at the memory address after the logical operation instruction.
Stored in address BUAO+3, address designation counter
APC has specified this address BUAO+3.

When a group of instructions consisting of an output instruction related to the specified output element and a logical operation instruction related to this output instruction is retrieved, the arithmetic processing unit 21 moves from step (41) to step (48), and executes the specified output element. Processing is performed to display an element, the element number of a conditional element related to this output element, and the on/off state of this output element and conditional element related to this output element. In other words, in step (48) the address designation counter
One unit of sequence data is read from the address in the buffer area BUA specified by the APC, and in step (50), data 100 of the input/output address programmed in the operand part of the read sequence data is displayed on the display 40 as an element number. to be displayed. Then, in step (51), the input/output address data programmed in the operand section is output to the sequence controller 10, the on/off state of the element corresponding to the programmed input/output address is detected, and step (52) is performed. ), the indicator lamp PL as status information is turned on or off depending on the detected on/off state. Furthermore, in step (53), the type of command is decoded from the read sequence data, and data for displaying this is output to the display 41.

As a result, the display 4 of the operation display panel 23
0 and 41 respectively display the element number 100 of the output element set as shown in Figure 6a and the code YON indicating that it is an output command, and the indicator lamp PL changes depending on the on/off state of the output element. The light is turned on or off. When this display operation is completed, it is determined in step (55) whether or not the element whose status is displayed is an output element, and if it is an output element as in this case, it is checked in step (56). After setting the flag OD, the process returns to the main routine of FIG. 8, and if it is not an output element, the flag OD is reset in step (57) and the process returns to the main routine.

In this embodiment, when data at the input/output address is output after interrupting the sequence controller 10, the input/output unit 13,
One of the input/output elements connected to 14 is selected,
A signal representing the on/off state of the selected element is output to the signal line IOB, and the on/off state of the element is determined by the signal on the signal line IOB.

When the state of the specified output element is displayed as described above, the operator repeatedly operates the display change command key 32 in order to monitor the on/off state of the condition element related to the on/off of the output element. As a result, the on/off states of C1 to C3 of the condition elements related to the set output element 01 are displayed in order.

That is, each time the display change command key 32 is operated, the arithmetic processing unit 21 executes the program shown in FIG. Execute the program from step (48) to step (57). In addition, if the flag OD is set, that is, if the element whose on/off state is currently displayed is an output element, the value of the address specification counter APC is reset to the value corresponding to the first address of the buffer area BUA. After setting, execute the routine after step (48).

Therefore, when the display change key 32 is operated while the on/off state of the output element is displayed as described above, the address designation counter APC designates the first address BUAO of the buffer area BUA, and the program starts from step (48). is executed. As a result, in step (48), the condition element C1 stored in the first address BUAO of the buffer area BUA is
The logic operation program TNA10 related to the above is read out as instruction data, and the programs from step (50) to step (53) display element numbers based on the read program TNA10,
The on/off status of this is displayed, and TNA, which indicates the type of logic operation instruction, is also displayed. And in this case, since the instruction is not an output instruction,
At step (57), the flag OD is reset and the program returns to the main routine. FIG. 6b shows the display state at this time.

Furthermore, when the display change command key 32 is operated after this, since the flag OD is in the reset state, the process moves from step (43) to (47), and the address designation counter APC is incremented in step (47). Do the same thing later. As a result, the logic operation program TFA20 regarding the conditional element C2 stored at the address BUAO+1 next to the first address of the buffer area BUA is read out, and based on this, the element number 20 of the conditional element, its on/off state, and the test command TFA are read out. The screen is displayed as shown in FIG. 6c. Then, when the display change command key 32 is operated again, the state of the condition element C3 is displayed, and when the display change command key 32 is operated again after this, the element number 10 of the output element 01 is displayed as shown in FIG. 6c.
0 and its on/off status are displayed again. In this state, if the operator wishes to see the states of the condition elements C1 to C3 again, press the display change command key 32.
You just need to continue operating. In this case, the flag OD is set, so step (47)
The address command counter APC returns to the buffer area.
Since the above operation is repeated after the start address of BUA is set to specify the logic operation instruction programmed at the beginning of a group of instructions related to the on/off of the specified output element, the condition elements C1 to The element number and on/off state of C3 are displayed again in order starting from conditional element C1.

In addition, in the above embodiment, the number of the conditional element and the on/off state are displayed, but the number of the conditional element and the logical operation result after testing each conditional element are displayed. The present invention can also be applied to this case, and in this case, the routine of step (52) in FIG. 2 may be changed as shown in FIG. 7. This routine performs a simulated logical operation based on the detected on/off state of the conditional element and the read logical operation command.
The logical operation results after testing each conditional element are displayed in the PL.

As described above, in the present invention, a conditional element that sequentially specifies a group of instructions consisting of an output instruction related to a specified output element and a logical operation instruction related to this output instruction and displays the element number and status information. If this counter specifies all the instructions in a group consisting of an output instruction related to a specified output element and a logical operation instruction related to this output instruction in one go, the first specified Since the counter value is specified again, by specifying the element number of the output element once, you can repeatedly monitor the status of multiple conditional elements related to the on/off of the specified output element.
Even if you accidentally operate the display change key, a group of instructions consisting of an output command related to a different output element and a logical operation instruction related to this output command will be read out, and a display based on this will not be performed, and the specified output element will not be displayed. This has the advantage that it is easy to monitor the states of conditional elements related to on/off.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a block diagram showing a status display device connected to a sequence controller, and FIGS. 2 and 3 show the operation of the arithmetic processing unit 21 in FIG. 1. 4 is a diagram showing an example of a relay circuit, FIG. 5 is a diagram showing a state in which a sequence program corresponding to the relay circuit shown in FIG. 4 is stored in the memory 22 of FIG. 1, and FIG. Figures a to f are diagrams showing changes in the display states of the indicators 40 and 41 and changes in the blinking state of the status display lamp PL in Figure 1, and Figure 7 shows the logical operation results after testing each condition element. FIG. 8 is a flowchart showing the main routine of the arithmetic processing unit 21. 10...Sequence controller, 11...Sequence memory, 20...Status display device, 21...
... Arithmetic processing unit, 22 ... Memory, 23 ... Operation display panel, 30 ... Numerical keys, 31 ... Search command key, 32 ... Display change command key, 40 ... Number display, PL ... Status display lamp.

Claims (1)

[Claims] 1. In a status display device for a sequence controller that displays the result of a logical operation after inputting the on/off states of a plurality of condition elements related to the on/off of a specific output element or the on/off states of these condition elements and performing a logical operation, an element number setting means for setting an element number of an output element; a search command setting means for setting a search command; a search means for searching for a group of instructions consisting of an output instruction regarding on/off of an output element with an element number set by the element number setting means and a logical operation instruction regarding a conditional element related to this output element; a group of instruction storage means for storing a group of instructions; an instruction designation counter for sequentially specifying memory addresses to which the group of instructions stored in the group of instruction storage means are written; reading means for detecting one of the plurality of conditional elements from the memory address at which the conditional element has been detected, outputting the detected conditional element to the sequence controller, and reading the on/off state of the conditional element from the sequence controller; a display means for displaying the on/off state of the conditional element read out or the logical operation result after performing a logical operation based on the on/off state together with the element number of the conditional element; and changing the content displayed on the display means. display change command means for commanding;
a counter increment means for incrementing the command command counter each time a display change is commanded; and a counter increment means for incrementing the command command counter by detecting that the command designation counter designates a programmed output command at the end of the group of commands to designate the command. 1. A status display device for a sequence controller, further comprising a reset means for resetting a counter to a memory address of a logical operation instruction at the head of the group of instructions.