JP2875136B2 - Programmable controller and counter END processing method thereof - 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 and a counter END processing method thereof, and more particularly to a counter function instruction of the programmable controller.

[0002]

2. Description of the Related Art FIG. 13 is a block diagram showing a system configuration of a programmable controller according to the prior art, wherein 1 is a main body of the programmable controller, 2 is a CPU for controlling the entire programmable controller 1, and
It operates according to the contents of the program stored in the system ROM 3. Reference numeral 5 denotes a system RAM, which stores a C-previous coil work and a C-current coil work used in the END processing for the counter.

Further, reference numeral 6 denotes a device memory accessible by a user by a sequence command, 7 a peripheral device for writing a sequence program or the like to a sequence RAM 10 in the programmable controller 1, and 8 an external input information to the programmable controller 1. An external input interface, 9 is an external output interface for outputting output information to the outside, and 10 is a sequence RA.
M, and writes a sequence program created by the user with the peripheral device 7. Reference numeral 11 denotes a system bus.

Next, the operation will be described. FIG.
6 is a flowchart illustrating a schematic processing operation of the programmable controller. First, an initial process is executed (S301). In the initial processing, processing indispensable for operating as the programmable controller 1, for example, initialization of a system RAM is executed. Next, it is determined whether the flag is a RUN flag or a STOP flag (S302). Here, RUN / STOP
If it is determined that the flag is STOP, an END process for the counter is executed (S304). Conversely,
If it is determined that the RUN / STOP flag is RUN, the END instruction is executed after executing the sequence program from step 0 to END step (S30).
3).

For example, in FIG. 16, when X1 changes from OFF to ON, C turns the current coil work ON / OFF.
As the ND processing, first, a subroutine of the END processing for the counter shown in step S304 is called. After the process of step S304 is completed, an END process other than the END process related to the counter is called as a subroutine in order to execute communication with the peripheral device 7 (S30).
5) After the processing in step S305 is completed, the RUN / STOP flag determination processing in step S302 is performed again.

FIG. 15 is a flowchart showing the details of the END processing for the counter shown in step S304. First, ON / OFF of the C contact device is determined (S401). If it is determined that the C contact device is ON, the process of step S407 is executed. Conversely, if it is determined that the C contact device is OFF, it is determined whether the C current coil work is ON / OFF (S402). If it is determined that the C current coil work is OFF, The processing of step S407 is performed. On the other hand, when it is determined that the C-current coil work is ON, ON / OFF of the C-previous coil work is determined (S403). , The processing of step S407 is executed. Conversely, when it is determined that the coil work before C is OFF, 1 is added to the current C value (S404).

Subsequently, a comparison is made between the C current value device and the C set value (S405). If it is determined that the C set value is larger than the C current value device (C current value device < (C setting value) is a state where the C current value device has not yet reached the C setting value.
07 is executed. Conversely, when it is determined that the C current value device is larger or equal (C current value device ≧ C set value), the count-up state is set and the C contact device is turned on (S406). Thereafter, the C current coil work is transferred to the C previous coil work (S
407), preparations for calling the next subroutine are executed.

Therefore, if the sequence program as shown in FIG. 16 is stored in the sequence RAM 10 from the peripheral device, the C1 contact device is turned on when X1 is turned on / off six times as shown in FIG. C
To turn off the setting device, turn on X1 and select [RS
TC] instruction must be executed.

FIG. 18 shows a device related to the counter instruction, and FIG. 19 shows a work RAM related to the counter instruction. As shown in FIG. 20, the C current coil work in the text is set by a counter instruction during execution of a sequence program. Therefore, in the END processing relating to the counter function command, only when the current coil work is ON and the previous coil work executed last time is OFF, C
The current value device is counted.

[0010]

Since the conventional programmable controller is configured as described above, it is necessary to use a counter reset instruction or the like when repeatedly executing a counter a fixed number of times in a counter function instruction. However, since the sequence program becomes complicated and the program capacity is increased, a large amount of time is required for debugging the sequence program created by the user, and there is a problem that work efficiency is poor.

In addition, the positioning of the workpiece can be performed accurately and
When executing at high speed, the work is operated at high speed up to near the specified position, and when reaching the specified position, the work is operated at low speed. Two counters must be set with the counter set at the completion position, and the number of device memories used also increases with the enlargement of the system, resulting in a shortage of device memory. there were.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. A programmable controller and a programmable controller that improve the efficiency of counter function instructions in a programmable controller, reduce the size of a sequence program, and improve the work efficiency. It is an object to obtain a counter END processing method.

[0013]

According to the present invention, there is provided a programmable controller comprising: a counting means for counting the number of ON / OFF of an external contact in an internal command of the programmable controller; a count value counted by the counting means; In a programmable controller having a contact device that is turned on when a set value set in the counter becomes equal (to a count-up state), when the counter-up state is reached, the contact device is turned on, and at the same time, the counting means is reset; Next, there is provided processing means for turning off the contact device when the external contact is turned on.

Further, according to the method of processing the counter END of the programmable controller according to the present invention, the ON / OF of the external contact is controlled by the internal command of the programmable controller.
F is counted, and when the counted value is equal to the set value set in the counter function instruction (into the count-up state), the contact device is turned on, and at the same time, the count value is reset. , When the external contact is turned on, the contact device is turned off.

Further, the programmable controller according to the present invention includes a counting means for counting the number of times the external contact is turned on / off in an internal command of the programmable controller; a first set value in the counter function command; A second set value larger than the first set value, and when the count value counted by the counting means is smaller than the first set value, the first contact device is turned on.
Then, when the count value counted by the counting means becomes equal to the first set value, the second contact device is turned on, and the count value counted by the counting means becomes larger than the first set value. A processing means for turning on the third contact device when it is larger and smaller than the second set value is provided.

Further, according to the counter END processing method of the programmable controller according to the present invention, the ON / OF of the external contact is controlled by the internal command of the programmable controller.
F is counted, and a first set value and a second set value larger than the first set value are provided in the counter function instruction, and the first set value is set when the count value is smaller than the first set value. When the contact device is turned on and the count value becomes equal to the first set value, the second contact device is turned on and when the count value is larger than the first set value and smaller than the second set value Then, the third contact device is turned on.

[0017]

According to the programmable controller and the counter END processing method of the present invention, a ring operation is performed on the programmable controller (the current value is automatically cleared when the number of external inputs reaches a set number, and when the next external input is performed, When the current counter value reaches the counter set value, the counter contact is turned ON and the counter current value is cleared to 0 at the same time. When the value changes from 0 to 1, the counter contact is turned off.

Also, the number of ON / OFF of external contacts and the like is counted by an internal command of the programmable controller, and a first set value and a second set value smaller than the first set value are stored in a counter function command. When the count value is smaller than the first set value, the first contact device is turned on.
N, the second contact device is turned on when the count value becomes equal to the first set value, and the third contact device is turned on when the count value is larger than the first set value and smaller than the second set value. Is turned on.

[0019]

【Example】

Embodiment 1 Hereinafter, an embodiment of a programmable controller according to the present invention will be described with reference to the drawings. FIG.
FIG. 14 is a block diagram showing a system configuration of a programmable controller according to the first embodiment, which has substantially the same configuration as the system shown in FIG. 13 of the conventional example, except for the counter END processing unit 4 in the system ROM 3. That is, the processing content is stored.

Next, the operation will be described. The schematic processing of the programmable controller 1 is as shown in FIG. 14, which is almost the same as the conventional technique. The difference is the subroutine called after executing the sequence program,
That is, the content of the END process for the counter.

FIG. 2 is a flowchart showing the operation of the END processing for the counter according to the first embodiment. First, the ON / OFF of a ring counter (hereinafter referred to as RC) current coil that changes during execution of a sequence program is determined (S101).
If it is determined that it is FF, the processing of step S107 is executed. On the other hand, when it is determined that the RC current coil work is ON, the ON of the RC previous coil work changed during execution of the sequence program in the previous scan is performed.
/ OFF is determined (S102). If it is determined that the pre-RC coil work is ON, the process proceeds to step S
If the process of step 107 is executed and, on the other hand, it is determined that the pre-RC coil work is OFF, 1 is added to the RC current value device (S103).

Next, a comparison is made between the RC current value device and the RC set value (S104). If it is determined that the RC set value is larger (RC current value device <RC set value), the RC current value device is still RC set. Since the current value device has not reached the RC set value or immediately after the RC current value has reached the RC set value, the RC contact is turned off (S10).
8) The process in step S107 is executed. Conversely, R
When it is determined that the C current value device is larger or equal (RC current value device ≧ RC set value), the RC contact is turned ON (S105) because the count-up state is established, and the RC current value device is turned off. A 0 clear process is executed (S106). Next, RC current coil work
It is transferred to the previous coil work (S107), and preparations are made for calling the present subroutine next time.

FIG. 3 shows an example of a sequence program according to the first embodiment, in which the number of ON / OFF operations of the external contact X1 is counted by a command (<RC1>), and the set value of RC (K6 times) is set to X1. RC when ON / OFF count reaches
The contacts are set to turn on. If the user sees FIG.
FIG. 4 shows the current value of RC and the operation timing of the contacts with respect to X1 when the sequence program shown in FIG. 4 is created in the peripheral device 7 and written into the sequence RAM in the programmable controller 1.
Shown in In FIG. 4, when the X1 is turned on for the sixth time, the RC current value becomes 0, and at the same time, the RC contact is turned on, and the X1 is turned on.
At the time of the seventh ON, the RC current value becomes 1, and at the same time, the RC contact turns OFF.

FIG. 5 shows a device relating to the counter instruction according to the first embodiment, and FIG. 6 shows a work RAM relating to the counter instruction.

Embodiment 2 Next, a second embodiment will be described. FIG. 7 is a block diagram illustrating a system configuration according to the second embodiment. The system configuration shown in FIG.
This is almost the same as the system configuration shown in FIG. 13 of the conventional example. The difference is that the processing contents of the counter END processing unit 12 are stored in the system ROM 3 and the device RA
That is, a counter-related device 13 is provided in M6.

Next, the operation will be described. The schematic processing of the programmable controller 1 is almost the same as that of the conventional example shown in FIG. Here, the difference is the END processing for the counter called after the execution of the sequence program. This processing will be described with reference to FIG.

First, it is determined whether the RC current coil is ON / OFF (S201).
If it is determined to be F, the process of step S213 is executed. If it is determined that the RC current coil work is ON, ON / OFF of the pre-RC coil work is determined (S202). Here, the coil work before RC is ON
If it is determined that is, the process of step S213 is executed. If it is determined that the pre-RC coil work is OFF, 1 is added to the RC current value device (S2).
03).

Subsequently, the RC current value device is compared with the RC set value 1 (S204). If it is determined that the RC1 set value 1 is larger (RC present value device <RC set value 1), Since the RC current value device has not reached the RC set value 1, the RC-LT contact is turned ON,
After turning off the RC-EQ contact, turning off the RC-GT contact (S205), and turning off the RC contact (S206),
The process of step S213 is performed.

If it is determined in step S204 that the RC current value device is equal to the RC set value 1 (RC current value device = RC set value 1),
RC-LT contact OFF, RC-EQ contact ON, RC
After turning off the GT contact (S207), step S2
13 is executed.

If it is determined in step S204 that the RC1 set value is larger than the RC1 current value device (RC present value device> RC set value 1), then the RC1 current value and the RC set value are set. A comparison with the value 2 is executed (S208). As a result, when it is determined that the RC current value is smaller (RC current value device <RC set value 2), the RC-LT contact is turned off, the RC-EQ contact is turned off, and the RC-GT contact is turned on ( After S209),
The process of step S213 is performed.

If it is determined in step S208 that the RC current value device is equal to or larger than the RC set value 2 (RC current value device ≧ RC
For the set value 2), the RC-LT contact was turned on, the RC-EQ contact was turned off, and the RC-GT contact was turned off (S210).
Thereafter, the RC contact value is cleared to 0 at the same time when the RC contact is turned ON (S211) (S212), and the process of step S213 is executed. In the above step S213, RC
Is transferred to the previous coil of the RC, and preparations are made for calling this subroutine next time.

FIG. 9 is an example of a sequence program of the programmable controller according to the second embodiment. The ON / OFF count of the external contact X1 is determined by a counter function command (<R
C>), and the smaller set value of RC (K
When the number of ON / OFF of X1 reaches 3), RC-LT
When the contact is turned off, the RC-EQ contact is turned on, and the ON / OFF count of X1 reaches the larger set value (K6),
RC-LT contact is ON, RC-GT contact is OFF, RC
-Contact is ON, RC current value is 0, next time X1 is ON
Then, the current RC value becomes 1, and the RC contact is turned off. FIG. 10 is a timing chart showing the operation of the counter in the example of the sequence program shown in FIG.

FIG. 11 shows a device relating to the counter instruction according to the second embodiment, and FIG. 12 shows a work RAM relating to the counter instruction.

[0034]

As described above, according to the programmable controller and the counter END processing method of the present invention, the current value of the counter reaches the set value of the counter without the user writing the counter reset command to the sequence RAM. Then, since the contacts and the current value of the counter can be automatically reset, the sequence program of the user can be reduced, and the debugging work can be reduced.

In addition, by providing two counter setting values in the counter instruction and providing the device memory in the programmable controller with information on the magnitude comparison of the counter current value with respect to the smaller counter setting value, accurate positioning of the work can be achieved. In addition, when performing at high speed, the work is operated at high speed up to the vicinity of the designated position, and at the vicinity of the designated position, the work is operated at low speed to complete the positioning. In this case, set the counter setting value 1 near the specified position,
By setting the counter set value 2 to the position where the positioning is completed, one counter device can be used, so that the user can reduce the time to understand the created sequence program.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a system configuration (first embodiment) of a programmable controller according to the present invention.

FIG. 2 is a flowchart showing an operation of an END process for a counter function instruction of the programmable controller according to the present invention.

FIG. 3 is an explanatory diagram showing an example of a sequence program of a counter function instruction created by a peripheral device of the programmable controller according to the present invention.

FIG. 4 is a timing chart showing an operation of a counter function instruction in the programmable controller according to the present invention.

FIG. 5 is an explanatory diagram showing devices related to a counter instruction of the programmable controller according to the present invention.

FIG. 6 is an explanatory diagram showing a work RAM related to a counter instruction of the programmable controller according to the present invention.

FIG. 7 is a block diagram showing a system configuration (Example 2) of a programmable controller according to the present invention.

FIG. 8 is a flowchart showing an operation of an END process for a counter function instruction of the programmable controller according to the present invention.

FIG. 9 is an explanatory diagram showing an example of a sequence program of a counter function instruction created by a peripheral device of the programmable controller according to the present invention.

FIG. 10 is a timing chart showing the operation of a counter function instruction in the programmable controller according to the present invention.

FIG. 11 is an explanatory diagram showing devices related to the counter instruction of the programmable controller according to the present invention.

FIG. 12 is an explanatory diagram showing a work RAM related to a counter instruction of the programmable controller according to the present invention.

FIG. 13 is a block diagram showing a system configuration of a conventional programmable controller.

FIG. 14 is a flowchart illustrating an operation of a schematic process of a programmable controller.

FIG. 15 is a flowchart showing an operation of an END process relating to a counter function instruction of a conventional programmable controller.

FIG. 16 is an explanatory diagram showing a sequence program example of a counter function instruction created by a conventional peripheral device.

FIG. 17 is a timing chart showing the operation of a conventional counter instruction.

FIG. 18 is an explanatory diagram showing a device related to a counter instruction in the related art.

FIG. 19 is an explanatory diagram showing a work RAM related to a conventional counter instruction.

FIG. 20 is a flowchart showing a series of processing operations in the counter processing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Programmable controller 2 CPU 3 System ROM 4 Counter END processing part 5 System RAM 6 Device RAM 7 Peripheral device 8 External input interface 9 External output interface 10 Sequence RAM 11 System bus 12 Counter END processing part 13 Counter related device

Claims (4)

(57) [Claims] A count means for counting the number of ON / OFF of an external contact in an internal command of a programmable controller, and a count value counted by the count means is equal to a set value set in a counter function command (count function). In a programmable controller having a contact device that is turned on when the external contact is turned on, the counter device is reset when the counter device is turned on. A programmable controller comprising processing means for turning off a contact device. 2. When the number of ON / OFF of the external contact is counted by an internal command of the programmable controller, and when the counted value is equal to the set value set in the counter function command (into a count-up state). And resetting the count value at the same time as turning on the contact device, and then turning off the contact device when the external contact is turned on. 3. A count means for counting the number of ON / OFF of an external contact in an internal command of a programmable controller, a first set value in a counter function command,
A second set value that is larger than the first set value, and when the count value counted by the count means is smaller than the first set value, turns on the first contact device; The second contact device is turned on when the count value counted by the above becomes equal to the first set value, and the count value counted by the counting means is larger than the first set value, and A programmable controller comprising processing means for turning on a third contact device when the value is smaller than a second set value. 4. A counting ON / OFF times of the external contact in internal instruction of the programmable controller comprises a first set value to the counter function in the instruction, the second set value larger than the first set value When the count value is smaller than the first set value, the first contact device is turned on. When the count value becomes equal to the first set value, the second contact device is turned on. And turning on the third contact device when the value is larger than the set value and smaller than the second set value.