JP3414038B2 - Programmable controller - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a programmable controller used in industrial equipment or the like, which can monitor the operating state of a CPU unit from an external peripheral device.

[0002]

2. Description of the Related Art FIG. 12 is a configuration diagram showing a configuration of a conventional programmable controller (hereinafter referred to as a PC). In the figure, 1 is a CP that is the center of control of the PC.
U unit, 2a is a CRT screen for displaying the monitor result,
Reference numeral 2b is an external peripheral device body for performing a monitor operation, 2c is a keyboard for transmitting a monitor request, 3 is an input / output unit for receiving an input signal from or outputting an output signal to an external device to be controlled such as a limit switch 4. 5 is an input / output port for exchanging signals with the input / output unit 3,
6 is a microprocessor for processing the CPU unit 1, 7 is a sequence program memory for storing a sequence program, 8 is a system ROM for storing a system program for giving instructions to the microprocessor 6, 9
a is a monitor request memory for storing the monitor request contents from the external peripheral device 2b, 9b is a monitor transmission memory for storing the monitor device data to the external peripheral device 2b, 9c is a monitor device storage memory for determining and registering the device to be monitored, Reference numeral 10 is a peripheral interface (hereinafter, referred to as peripheral I / F) for communicating with the external peripheral device 2b, 11 is a device memory for storing the execution result of the sequence program, and 13 is a calculation result of the execution program step of the current sequence program. It is an operation result register to store.

Next, the operation will be described. First, the basic operation of the PC will be described with reference to the flowchart shown in FIG.
First, when the power of the PC is turned on, initial processing such as parameter check and memory capacity check for executing the sequence program stored in the sequence program memory 7 is executed in step ST41, and then in step ST42. , Executes the sequence program for sequence control. After the execution of the sequence program, in step ST43, it is determined whether or not there is an END instruction for ending the sequence control. If the END instruction is not present, the process returns to step ST42 to continue the sequence control, Continue sequence control. If the END instruction is present, the END process is executed in step ST44, the series of sequence control is ended, the process returns to step ST42 to perform the next sequence control, and the above process is repeated.
Here, one process that is repeated from step ST42 to step ST44 is called a scan.

Next, the conventional monitor processing in the external peripheral device 2b will be described with reference to the flowchart relating to the monitor processing in the external peripheral device 2b in FIG. In step ST51, the monitor setting key, that is, the screen to be monitored is selected from the keyboard 2c, the device to be monitored is determined from the selected screen information in step ST52, and the monitor device storage memory in the CPU unit 1 is set via the peripheral I / F 10. After registration in 9c, a monitor request is issued to the CPU unit 1 in step ST53. Then, in step ST54, the status of the device to be monitored is received from the device memory 11 of the CPU unit 1, and in step ST55, the device status and the circuit symbol are displayed on the CRT screen 2a. After the monitor display,
In step ST56, it is determined whether or not the monitor processing is completed, and if it is determined that the monitor processing is not completed,
Returning to the processing of step ST53, the same processing is repeatedly executed. On the contrary, when it is determined in step ST56 that the monitor process is completed, this process is completed.

Next, the conventional monitor processing of the CPU unit 1 will be described with reference to FIGS. FIG. 15 is a configuration diagram showing the configurations of the monitor request memory 9a and the monitor transmission memory 9b. In the figure, 9a1 is a monitor request flag for confirming whether or not there is a monitor request, and 9a1.
a2 is a monitor device score indicating the number of devices to be monitored, 9a3 to 9aN are device codes to be monitored, 9
b1 to 9bN are data of the monitor device.

FIG. 16 is a flowchart showing 1-byte transmission from the external peripheral device 2b, and FIG. 17 is a flowchart showing detailed processing of the END processing of the PC. In FIG. 16, when an interrupt is input from the peripheral I / F 10 to the CPU unit 1 that occurs each time the transmission data from the external peripheral device 2b is received,
In step ST61, it is determined whether or not the interrupt is a monitor request, and if it is a monitor request, step ST62 in FIG.
Of the monitor request memory 9a and the device code No. 9a2. 1-NO. N (9a3 to 9aN) is set for each data. Then, in step ST63, it is determined whether or not all the data has been received, and when all the data has been received, the monitor request flag 9a1 is turned on (step ST6
4), the interrupt processing ends.

Next, the END processing will be described with reference to FIG. The END processing is roughly classified. I input signals and output signals from the limit switch 4 to the input / output unit 3 to the device memory 11 via the input / output port 5.
/ O refresh processing, timer on device memory 11, self-diagnosis processing such as updating the current value of counter and error detection, peripheral processing for communicating with external peripheral device 2b, and monitoring request from external peripheral device 2b Then CP
It consists of a monitor process for reading the device state inside the U. First, after performing an I / O refresh process in step ST71, a self-diagnosis process is performed in step ST72, a peripheral process in step ST73, and then step ST7.
4. In step ST75, monitor processing is performed.

The monitoring process will be described in detail. In step ST74, it is determined whether or not the monitor request flag 9a1 in the monitor request memory 9a is ON. If it is ON, the process proceeds to step ST75 to monitor each monitor device. The status for the device for which the monitor request is made, which is stored in the memory 11 of the device, is read from the device memory 11 and the device No. of the monitor transmission memory 9b is read. 1 data to device No. The data is stored in the N data area (9b1 to 9bN), and the data is transmitted to the external peripheral device 2b via the peripheral I / F 10. On the other hand, if the monitor request flag 9a1 is not turned on, there is no monitor request, and thus the series of processes described above ends.

FIG. 18 is a view showing a monitor screen displayed on the CRT screen 2a, and 60 is a circuit monitor screen of the PC when the circuit monitor of the program is actually executed,
Reference numeral 70 is a device current display screen obtained by the circuit monitor. In the circuit monitor screen 60, 61 is a sequence circuit, and 62 is one of bit devices. The input signal X0 for fetching data from the input / output unit 3 directly connected to the limit switch 4 to the device memory 11 via the input / output port 5 A contact, 63 is a transfer instruction for transferring a constant K2 (K represents a decimal number) to the word device D0,
64 is a transfer command for transferring the word device D0 to the word device D1, 65 is an output coil of the bit device M2, 66 is a contact point of the bit device M2, and 67 is a constant K3.
To a word device D0, and 68 is an END instruction indicating the end of the sequence program. In the device current display screen 70, 71 is the monitoring result of the word device D0, and 72 is the monitoring result of the word device D1.

In FIG. 18, a contact 62 for the input signal X0
Is turned on, the transfer instruction 63 is executed, the value K2 is transferred to the word device D0, and the bit device M2 is transferred.
Output coil 65 is turned on. The contents of the word device D0 at this point are K2. After that, the sequence program after the next step is executed, and the END instruction 68
Just before, the bit device M2 is turned on, the transfer instruction 67 is executed, and the value K3 is transferred to the word device D0. That is, the contents of the word device D0 are actually
Although the transfer instruction 67 changes from K2 to K3, the device or the like is monitored at a certain timing of the CPU unit 1, for example, in the state where the END process is being performed. Therefore, the content of the word device D0 is K3 on the circuit monitor.
However, it was impossible to monitor at the timing specified by the user. If the user wants to know the state of the word device D0 when the contact 62 of the input signal X0 is turned on, the contents of the word device D0 are stored in the word device D1 and the word device D1 is monitored, as in 64. Therefore, it is necessary to confirm the state of the word device D0 when the contact 62 of the input signal X0 is ON by monitoring the state of the word device D1.

The above-mentioned conventional programmable controller with improved monitor processing is disclosed in, for example, Japanese Patent Laid-Open No. 3-24.
There is a method disclosed in Japanese Patent No. 6602. FIG. 19 is a block diagram showing the configuration of a conventional programmable controller disclosed in Japanese Patent Laid-Open No. 3-246602. In the figure, 81 is a program storage unit for storing a program, 82 is an arithmetic unit for executing the program, 83 is a data storage unit for storing data necessary for executing the program, or a running state or an intermediate result of the operation, Reference numeral 84 is an input / output unit for connecting a controlled device or the like, 85 is a monitor storage unit in which an address in the program storage unit 1 at a step position to be monitored is stored in advance, and 86 is an address coincidence determination unit.

Next, the operation will be described. When the execution of the program is started, the arithmetic unit 82 causes the program storage unit 1 to
The program is read out and the execution is continued while sequentially stepping through the addresses. In the program execution process, the address match determination unit 86 monitors whether the address being executed in the program storage unit 81 and the address stored in the monitor storage unit 85 match, and if both addresses match, the address match determination unit 86. Outputs a match signal from. When the arithmetic unit 82 receives the coincidence signal from the address coincidence judging unit 86, the bit device at that time is turned on.
The / OFF state and the device data which is the current value data of the word device are stored in the monitor storage unit 85. The above-described operation is continued until one scan of the program is completed, so that the monitor result (device data) of the required location is stored in the monitor storage unit 85 at the end of one scan. The supervisor monitors the operation of the execution process by referring to the contents of the portion requiring monitoring, which is stored in the monitor storage unit 85.

[0013]

The conventional programmable controller as shown in FIG. 19 as described above stores in advance the address in the program memory 81 of the step position to be monitored in the monitor memory 85. If a match is found by comparison with the step position in actual sequence control, the bit device is turned ON / ON at that time.
Device data, which is the OFF state and the current value data of the word device, is stored in the monitor storage unit 85, and the monitoring result (device data) of the required portion is monitored after one scan is completed. Therefore, the device data can be monitored at the monitor step position desired to be monitored, but the device data is monitored only at the monitor step position, and the actual execution state of the sequence program (ON / OFF / rise / There is a problem in that it is impossible to monitor device data in consideration of (falling), and it is impossible to specify and monitor device data in an execution state that the user really wants. Further, the setting of the monitor step number in the conventional apparatus shown in FIG. 19 is performed by manually checking the step number of the instruction used by the user in the sequence program,
Calculate the desired monitor step number, or exit the circuit monitor screen and display it on the program list screen.
There was another problem that the desired monitor step number had to be found from the list screen.

The present invention has been made to solve the above problems, and a first object thereof is to provide a programmable controller capable of monitoring device data in the execution state of a sequence program desired by a user. Is to get. A second object is to obtain a programmable controller capable of monitoring device data in the execution state of the sequence program desired by the user even in a plurality of scans in which the sequence program is repeatedly executed. Further, a third object is to obtain a programmable controller that facilitates setting monitor step numbers.

[0015]

In a programmable controller according to the present invention, a monitor step number setting means for setting a monitor step number to be monitored in a sequence program and a monitor set by the monitor step number setting means. In the step number, the monitor step condition setting means for setting the monitor step condition which is the state of the contact in the execution program step of the sequence program, and both the monitor step number and the monitor step condition are the execution program step number of the sequence program. And monitor output means for outputting the device data as a monitor when the state of the contact at the execution program step number matches.

Further, the monitor step condition set by the monitor step condition setting means is set to ON / OFF of the contact.
It is a condition.

Further, the contact at the execution program step of the sequence program of the current scan of the monitor step condition set by the monitor step condition setting means rises / falls from the state of the contact at the same monitor step number of the previous scan. It is a condition.

Further, when setting the monitor step number by the monitor step number setting means, the monitor step number is automatically set based on the position of the designated cursor on the sequence program display screen displayed on the monitor. It was done.

[0019]

In the PC configured as described above, the state of the contact at the execution program step of the sequence program is judged at the set monitor step number, and the monitor step number and the monitor step condition are the same as the execution program of the sequence program. Since the monitor output is performed when they match, the device data can be monitored in the execution state of the sequence program desired by the user.

When the monitor step condition is set to the ON / OFF state of the contact of the execution program step of the sequence program at the set monitor step number, and the monitor step number and the monitor step condition match the execution program of the sequence program, Since the monitor output is performed, it is possible to monitor the device data according to the state of the contact which is the execution state of the sequence program.

Further, the state of the contact at the monitor step number of the previous scan and the state of the contact at the same monitor step number of the sequence program currently being executed are judged, and at the same monitor step number, the current state from the previous scan is displayed. Since the monitor output is made when the monitor step conditions such as whether it has risen or fallen during the scan match, the device data can be monitored at the user's desired time even in the execution state of the sequence program over a plurality of scans.

Further, by the monitor step number setting means, on the sequence program display screen displayed on the monitor, by moving the cursor to a desired step position on the program display screen, the position of the cursor on the display screen is set. The monitor step number can be automatically registered as the step position of the actual sequence program.

[0023]

【Example】

Example 1. FIG. 1 is a configuration diagram showing the configuration of a PC that is an embodiment of the present invention. In the figure, 3-9c, 10,
Since the components 11 and 13 have the same configuration as that of the conventional PC described above, the description thereof will be omitted. 1A is a CPU unit which is the center of control of the PC in the present invention, 2aA is a CRT screen for monitoring the sequence program execution state and data state at designated step numbers, 2bA is an external peripheral device capable of the above-mentioned monitoring, 2cA Is a keyboard to which monitor condition number setting means and monitor condition condition setting keys are added to perform the monitor output, and 9d is a monitor condition (monitor step number, monitor step condition) set from the external peripheral device 2bA. ), A step number memory 9dA for storing a monitor step number, a step condition memory 9dB for storing a monitor step condition,
It is composed of a monitor condition registration flag 9dC indicating whether the monitor condition is registered. Reference numeral 12 is an address comparison circuit which constantly compares the monitor step number set in the step number memory 9dA with the execution address (execution program step number) of the sequence program memory 7 and gives an interrupt signal to the CPU 6 when they match (address match). 1
3A shows the execution state (ON of the monitor step number stored in the monitor condition memory 9d when the above addresses match).
/ OFF) is a calculation result register for storing the previous work memory.

Next, the monitoring process of the external peripheral device 2bA of the first embodiment will be described with reference to the flowchart of FIG. 2 relating to the monitoring process of the external peripheral device 2bA. Step S
At T1, after setting the monitor step number from the keyboard 2cA (described later), step ST2
Then, the monitor step condition is set (described later). After that, in step ST3, the screen to be monitored is selected in the same manner as in the conventional case. In step ST4, the device to be monitored is selected from the screen information, and the monitor step number set in step ST1 and the step ST2 are set. Register with monitor step conditions. That is, the device to be monitored in the monitor device storage memory 9c in the CPU unit 1A via the peripheral I / F 10 is registered in the step number memory 9dA, the monitor step number, and the step condition memory 9dB, and the monitor step condition is registered. , Monitor condition registration flag 9d
Turn on C.

Then, in step ST6, a monitor request is issued to the CPU unit 1A, and the status of the device to be monitored (device data) is received from the CPU unit 1A corresponding to the monitor request (step ST6).
7) In step ST8, the device status and the circuit symbol are displayed on the CRT screen 2aA by monitor display. After the monitor display, in step ST9, it is determined whether or not the monitor process is completed. If it is determined that the monitor process is not completed, the process returns to step ST6 and the same process is repeated. On the other hand, if it is determined in step ST9 that the monitor process has ended, this process ends.

Here, a flow chart showing the detailed process of the monitor step number setting process (step ST1) of FIG. 3 and the CRT screen 2a at the time of setting the monitor conditions of FIGS.
The monitor step number setting process will be described in detail with reference to the screen diagram on A. FIG. 4 is a diagram in which, for example, the monitoring timing is determined at the 100th step. In the figure, 20 is the sequence program of the step portion at which the actual monitoring is desired, and 21 is the input signal X0.
, 22 is the 100th step which is the timing to be monitored, 23 is a command to turn on the internal device M0,
Reference numeral 24 is an instruction to increment the content of the word register R0.

FIG. 5 is a diagram showing a screen for setting the monitor condition (monitor step number automatic selection setting). In the figure, numeral 25 indicates whether or not the monitor step number designated by the monitor is automatically set. Selection screen to decide, 27
Is a message for setting monitor step number automatic selection, 2
8 and 29 are the above options. 6 and 7 show the external peripheral device 2 when executing the monitor of the control state of the program and data at the set monitor step number.
FIG. 6 is a diagram showing a screen for setting the monitor condition of FIG. Figure 6
In FIG. 3, 30 is a monitor condition setting screen, 31 is a selection field when monitoring is performed during END processing as in the conventional case, and 32 is not monitored during conventional END processing, but is monitored when a certain monitor step condition is satisfied. The monitor step number is registered in 33, and any one of the monitor step conditions (ON / OFF / rise / fall) 35 is set and registered in 34.

In the flowchart of FIG. 3, first, in step ST11, it is determined whether or not the automatic setting of the monitor step number is selected on the monitor step number automatic selection setting screen (FIG. 5) on the CRT screen 2aA screen, If automatic setting is selected, the process proceeds to step ST12 and CR
In the sequence program on T2aA (see FIG. 4), the operator moves the cursor to the step at the timing desired to be monitored by himself using the mouse, the keyboard 2cA, or the like. After that, in step ST13, the step number at the current cursor position is read out, and in step ST14, the read step number is used as a monitor step number in a monitor condition setting screen (see FIG. 6: monitor condition screen example in the setting of FIG. 4). , 10 in the step number setting field 33
(The monitor step number "0" is automatically set)
, And the monitor step number setting process ends.
Further, in step ST11, if the automatic setting of the step number is not selected, the monitor step number setting operation is performed in the same manner as in the conventional case (the operator reads the manual for the step number of the instruction used in the sequence program, The desired monitor step number is calculated and registered), and the monitor step number setting process ends.

Since the monitor step number can be automatically selected and set in this way, the operator himself manually checks the number of steps of the instruction used in the sequence program, and requests the monitored number of steps. By registering as the monitor step number, the troublesomeness of manually checking the desired number of steps and performing monitoring by inputting the checked number of steps is eliminated.

Next, the monitor step condition setting processing will be described in detail with reference to the screen diagram on the CRT screen 2aA when the monitor conditions are set in FIG. The monitor step condition is a condition that, after the monitor step number is set (step ST1), it is determined whether or not to monitor at the set monitor step number. That is, at the set monitor step number, "ON" or "OF"
Set to monitor when "F", or "fall" or OF that is a change from ON state to OFF state at the set step number.
"Rise", which is the change from F state to ON state
It is necessary to set to monitor when. Figure 7
Displays the step condition (ON / O) on the monitor condition setting screen 30A in which the monitor step number 33 “100” is set.
It is the figure which selected the condition "ON" of the step to be monitored from FF / rise / fall) 35 and set it in the step condition setting field 34A.

Next, the monitoring process of the PC of this embodiment will be described with reference to FIG.
END processing flowchart of the CPU unit 1A,
This will be described with reference to the flowchart of FIG. 9 showing the processing of the CPU unit 1A at the time of the monitor processing, and FIG. 10 and the monitor screen diagram when the monitor conditions are set.

In the END processing of FIG. 8, step ST
21 to step ST23 are the same as step ST81 to step ST83 of the above-described conventional example (see FIG. 17), and therefore description thereof will be omitted. After the peripheral processing which is the communication with the external peripheral device 2bA in step ST23, step S
At T24, it is judged whether the monitor condition registration flag 9dC in the monitor condition memory 9d is ON. If it is ON, the monitor is performed under the monitor step condition regardless of the presence or absence of the monitor request. A certain END process is ended. If the monitor condition registration flag 9dC is OFF as a result of the judgment of "ON / OFF" of the monitor condition registration flag 9dC in step ST24, the conventional PC EN is used.
Similar to the D process, in step ST25, it is determined whether or not there is a monitor request, and if there is a monitor request, the process proceeds to step ST26, the state (device data) of the device to be monitored is read from the device memory 11, and the peripheral I / F 1
After performing a monitor process of transmitting to the external peripheral device 2bA via 0, a series of END processes is ended. On the other hand, as a result of the determination of the monitor condition registration flag 9dC in step ST25, if there is no monitor request, it is not necessary to perform the monitor process, and thus the monitor process is ended and the series of processes is ended.

In FIG. 9, the address comparison circuit 12 constantly monitors the step number set in the step number memory 9dA and the execution program step number in the sequence program memory 7, and when they match (address match), they are assigned to the microprocessor 6. When a built-in signal is generated, C
The processing performed by the PU unit 1A will be described. The address comparison circuit 12 reads the monitor step condition set in the step condition memory 9 dB in step ST31, and reads the contents of the calculation result register 13 in step ST32. After that, the process proceeds to step ST33, and if the monitor step condition set by the user read in step ST31 is "ON / OFF", the process proceeds to step ST34.

In step ST34, the monitor step condition requested by the user is "ON / OFF". Therefore, the monitor step condition "ON / OFF" is changed to the operation result register 13 in the execution program step of the current sequence program. And the contents (contents read in step ST31) are compared. As a result of the comparison in step ST34, if the contents of "ON / OFF" in the current execution program step of the sequence pro and the monitor step conditions read in step ST31 match, the current execution program of the sequence pro Since the contents of the calculation result register 13 in the step are the monitor conditions required by the user,
In step ST35, the state (device data) of the device having the monitor request is read from the device memory 11, and the data is transmitted to the external peripheral device 2bA via the peripheral I / F 10. After that, in step ST36, the contents of the operation result register 13 read in step ST32 are stored in the operation result register previous work memory 13A, and this processing ends.

On the other hand, as a result of the comparison in step ST34,
If the contents of “ON / OFF” in the current execution program step of the sequence program and the monitor step conditions read in step ST31 do not match, it is impossible to monitor under the monitor step conditions required by the user. The process of step ST35 is not performed, but the process of step ST36 is directly performed, and the present process ends.

In step ST33, the monitor step condition read in step ST31 is judged,
If the monitor step condition is "rising / falling", the process proceeds to step ST37 and step ST32.
It is determined whether or not the operation result of the current sequence program execution program step read out in step 4 matches the condition requested by the user. Step ST37
Then, if the monitor step condition requested by the user is, for example, "rise", and if the calculation result of the current sequence program execution program step read in step ST32 is "OFF", it is turned off from the previous scan ( Since it is changed to (current scan), it cannot be said to be "rising", and the process directly proceeds to step ST36. However, if the calculation result of the current sequence program execution program step read in step ST32 is "ON", it changes from the previous scan to ON (this time scan), so that the monitor step condition "rise" may be satisfied. Yes, the process proceeds to step ST38.

In step ST38, if the calculation result of the previous sequence program execution program step in the calculation result register previous work memory 13A is "ON", from ON (previous scan) to ON (current scan) is "rising". I'm not saying that, so step S
The process proceeds to T36, the contents of the operation result register 13 read out in step ST32 are stored in the operation result register previous work memory 13A, and this processing is ended. On the other hand, if the calculation result of the previous sequence program execution program step in the calculation result register previous work memory 13A is "OFF", it turns from OFF (previous scan) to ON.
Since (current scan) is "rising" and the monitor step condition is satisfied, the process proceeds to step ST35, the state (device data) of the device having the monitor request is read from the device memory 11, and the data is stored in the peripheral area. It is transmitted to the external peripheral device 2bA via the I / F 10. After that, in step ST36, the contents of the operation result register 13 read in step ST32 are stored in the operation result register previous work memory 13A, and this processing ends.

If the monitor step condition requested by the user is, for example, "falling", if the operation result of the current sequence program execution program step read in step ST32 is "ON",
Since it changes from the previous scan to ON (current scan), it cannot be said to be "falling", and the process directly proceeds to step ST36. On the other hand, similarly, if the calculation result of the current sequence program execution program step read in step ST32 is "OFF", it changes from the previous scan to OFF (current scan), so the monitor step condition "falling" is satisfied. Therefore, the process proceeds to step ST38.

In step ST38, if the calculation result of the previous sequence program execution program step in the calculation result register previous work memory 13A is "OFF", OFF (previous scan) to OFF (current scan) is "falling". Since I don't say "," step S
The process proceeds to T36, the contents of the operation result register 13 read out in step ST32 are stored in the operation result register previous work memory 13A, and this processing is ended. On the other hand, if the calculation result of the previous sequence program execution program step in the calculation result register previous work memory 13A is "ON", it turns from ON (previous scan) to OFF.
Since (current scan) is "falling" and the monitor step condition is satisfied, the process proceeds to step ST35, the state (device data) of the device with the monitor request is read from the device memory 11, and the data is read. It is transmitted to the external peripheral device 2bA via the peripheral I / F 10. After that, in step ST36, the contents of the operation result register 13 read in step ST32 are stored in the operation result register previous work memory 13A, and this processing ends.

Next, description will be made using a monitor screen output on the actual CRT screen 2aA. In FIG. 10, for example, the monitor step number is the 100th step as the monitor condition,
It is a monitor screen output when the monitor step condition is turned "ON". In the figure, 40 is a circuit monitor screen under given monitor conditions, 41 is a circuit of the program, 42 is a contact of the input signal X0, 43 is the 100th step of the sequence program, 44 is the bit device M0.
Of the output coil, 45 is a transfer instruction for inserting data "K3" into the word register R0, 46 is a contact of the input signal X1, and 47 is a transfer instruction for inserting data K10 into the word register R0. Reference numeral 48 is a device current value display screen, and 49 is a result of monitoring the contents of the word register R0.

For example, according to the sequence program,
When the contact 42 of the input signal X0 is turned on, the execution condition of the 100th step is turned on, the output coil 44 of the internal device M0 is turned on, and the data “K3” is transferred to the word device R0. After that, the contact 46 of the input signal X1 is turned on, and the data "K10" is transferred to the word device R0. According to this embodiment, the monitor condition is 10
Since it is “ON” at the 0th step, as shown in FIG. 10, it indicates that the contact 42 of the input signal X0, which is the ON / OFF state of the bit device, is ON by, for example, knitting. The contact 46 of X1 is in the OFF state without shading. Then, on the device current value display screen 48, the current value data of the word device R0 is “K3” at the “ON” time of the 100th step.
Monitor that it has data.

Therefore, O of any monitor step number
It is possible to obtain the monitor result that the user desires to be N / OFF, and the output that normally should not operate is O
If N, or impossible data, word register D0
When transferred to, it is possible to confirm which contact caused such operation. Further, there is an effect that it is possible to shorten the time taken to elucidate the cause when a failure occurs or an abnormality occurs in the sequence program processing.
Furthermore, it is possible to shorten the debugging time in the user's system design.

FIG. 11 shows a monitor screen output when the monitor step number is the 100th step and the monitor step condition is "rising" as the monitor condition. In the figure, 50 is a circuit monitor screen under given monitor conditions, 51 is a circuit of the program, 52 is a contact of the input signal X1, 53 is a contact of the input signal X2, 54 is the 100th step of the sequence program, 55 is an instruction for incrementing the data of the word device D0, 5
Reference numeral 6 is a contact of the input signal X3. 57 is a device current value display screen, and 58 is a result of monitoring the contents of the word register D0.

For example, in the sequence program as shown in FIG. 11, as a condition for executing the increment instruction 55, both the contact 52 of the input signal X1 and the contact 53 of the input signal X2 are turned on and the contact 56 of the input signal X3 is turned on.
There are two factors for turning on. In the present embodiment, if the monitor step number is the 100th step and the monitor step condition is “rising”, the execution state of the monitor step is determined and the monitor display is made only in the case of “rising”. It is possible to understand from the circuit monitor screen 50 whether the 100th step has risen due to the factor (1) and the increment instruction 55 has been executed.

In FIG. 11, for example, the contact is "ON".
Since it is knitted in the state of, the increment instruction 55 is executed because the contact 56 of the input signal X3 rises from the state of “OFF” to the state of “ON”. The contact 53 for the input signal X2 by braiding the contacts
It can be similarly understood that is also in the "ON" state. If the 100th step is "ON", the instruction 55 for incrementing the data of the word device D0 is executed, so that the content of the word device D0 actually changes every scan. However, since the monitoring condition is the rising of the 100th step, the data of the word device D0 is the data at the rising edge unless the rising edge of the current execution program step of the current sequence program is detected as compared with the previous execution program step. Continue to monitor (eg, K1).

Therefore, it is possible to obtain the monitor result of the "rise / fall" of an arbitrary monitor step number in a state desired by the user, and once every several thousand scans during the operation of the complicated sequence program processing. When the state of an arbitrary step is executed as OFF → ON → OFF at a rate of, it is difficult for the conventional monitor to even notice that the arbitrary step is turned ON, and thus it is difficult to find a failure. The cause of can be set to "rising / falling" in the monitor condition, so the status of other devices at that time can be monitored, so it is possible to obtain information leading to elucidation of the cause of failure. .

In the present embodiment, it has been described that the ON / OFF indication of the contact and the output coil, which is a bit device, is distinguished by knitting, but the present invention is not limited to this, and the device is not limited to this. ON / OFF
It goes without saying that the same applies if the display is such that the state can be recognized.

【The invention's effect】

Since the present invention is configured as described above, it has the following effects. A monitor step number setting means for setting a monitor step number to be monitored in the sequence program, and a monitor step number set by the monitor step number setting means, which is a contact state at the execution program step of the sequence program. Monitor output when the monitor step condition setting means for setting step conditions and both the monitor step number and the monitor step condition match the execution program step number of the sequence program and the contact state at the execution program step number Since it is provided with a monitor output means, the device data can be monitored in the execution state of the sequence program desired by the user.

Further, the monitor step condition set by the monitor step condition setting means is set to ON / OFF of the contact.
Since it is a condition, it is possible to monitor the device data in the execution state of the sequence program desired by the user based on the contact state. Therefore, when a failure occurs or an abnormality occurs in the sequence program processing, it is possible to shorten the time required for elucidating the cause, and it is also possible to shorten the debugging time in the user's system design.

Further, the monitor step condition set by the monitor step condition setting means is set to the rising / falling condition from the state of the contact at the execution program step of the sequence program of the current scan to the contact at the same monitor step number of the previous scan. Therefore, even in a plurality of scans in which the sequence program is repeatedly executed, it is possible to reliably monitor the device data in the execution state of the sequence program desired by the user.

Furthermore, when the monitor step number is set by the monitor step number setting means, the monitor step number is automatically set based on the position of the designated cursor on the sequence program display screen displayed on the monitor. Therefore, the user can read the manual for the step number of the instruction used in the sequence program and check it, and the troublesome step of calculating the desired step number can be omitted, so that the workability is improved.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a configuration of a PC of the present invention.

FIG. 2 is a flowchart relating to a monitor process of an external peripheral device.

FIG. 3 is a flowchart showing detailed processing of monitor step number setting processing.

FIG. 4 is a screen view on a CRT when setting monitor conditions.

FIG. 5 is a screen view on a CRT when setting monitor conditions.

FIG. 6 is a screen view on a CRT when setting monitor conditions.

FIG. 7 is a screen view on a CRT when setting monitor conditions.

FIG. 8 is a flowchart showing an END process of the CPU unit.

FIG. 9 is a flowchart showing the processing of the CPU unit during the monitor processing.

FIG. 10 is a monitor screen diagram when monitor conditions are set.

FIG. 11 is a monitor screen diagram when monitor conditions are set.

FIG. 12 is a configuration diagram showing a configuration of a conventional PC.

FIG. 13 is a flowchart showing a series of processes of a conventional PC.

FIG. 14 is a flowchart of a conventional external peripheral device monitoring process.

FIG. 15 is a configuration diagram showing configurations of a monitor request memory and a monitor transmission memory.

FIG. 16 is a flowchart regarding transmission from an external peripheral device.

FIG. 17 is a flowchart showing END processing of a PC.

FIG. 18 is a monitor screen view displayed on the CRT.

FIG. 19 is a block diagram showing a configuration of a conventional PC.

[Explanation of symbols]

1A CPU unit 2aA CRT 2bA External peripheral device 2cA Keyboard 3 Input / output unit 5 Input / output port 6 Microprocessor 7 Sequence program memory 8 System ROM 9d Monitor condition memory 10 Peripheral I / F 11 Device memory 12 Address comparison circuit 13 Operation result register 13A Calculation result register Previous work memory

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) G05B 23/00-23/02 G05B 19/02-19/05

Claims (4)

(57) [Claims] 1. A monitor step number setting means for setting a monitor step number to be monitored in a sequence program, and a monitor step number set by the monitor step number setting means, in the execution program step of the sequence program. The monitor step condition setting means for setting the monitor step condition which is the state of No. 1 and the monitor step number and the monitor step condition both match the execution program step number of the sequence program and the contact state at the execution program step number. At this time, a programmable controller comprising a monitor output means for outputting device data as a monitor. 2. The programmable controller according to claim 1, wherein the monitor step condition set by the monitor step condition setting means is a contact ON / OFF condition. 3. The contact at the execution program step of the sequence program of the current scan of the monitor step condition set by the monitor step condition setting means rises / falls from the state of the contact at the same monitor step number of the previous scan. The programmable controller according to claim 1, wherein the condition is set. 4. When setting the monitor step number by the monitor step number setting means, the monitor step number is automatically set based on the position of the designated cursor on the sequence program display screen displayed on the monitor. The programmable controller according to any one of claims 1 to 3, which is characterized.