Here is a detailed explanation of the program logic for reference:
The program begins by initializing a counter. In this example, the set value is 10. When the start button I0.1 is pressed, the device starts running. A signal is then input through I0.0. Once the current count matches the preset value of 10, the output point is disconnected, and the device stops. The stop button is I0.2, which can be used to manually halt the operation at any time.
The step-by-step procedure is as follows:
- LDS M0.1
- MOVB 16#C8, SMB37
- HDEF 0, 0
- MOVD +0, SMD38
- HSC 0
Program notes:
(1) The high-speed counter HSC0 is initialized. The control byte 16#C8 means that the initial value needs to be set, the preset value isn't loaded, and the counting direction remains unchanged during operation. The counter type is increment-only.
(2) The HDEF instruction is used to configure the mode of the high-speed counter. In this case, HSC0 is set to mode 0.
(3) The initial value of the counter is set to 0.
(4) The HSC instruction is executed to apply the configuration to HSC0.
Another part of the program is:
- LD N M14.0
- EU MOVB
- 16#C8, SMB37
- MOVD +0, SMD38
- HSC 0
Note: When the speed value reaches the target, M14.0 is reset, and the counter returns to its initial value for the next cycle.
Then:
- LDD HC0, +10
- = M14.0
This means that M14.0 is always set when the counter value is less than 10.
Finally:
- LD I0.1
- O Q0.0
- AN I0.2
- AM M14.0
- = Q0.0
Notes on this section:
I0.1 acts as the start signal for the device, while I0.2 is the stop button. When the high-speed counter reaches 10, the output Q0.0 is turned off, and the device halts.
This logic ensures controlled operation based on the counter value, allowing for precise automation in industrial applications.
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