PLC custom time countdown program design ideas

Categorize:Industry Information
Author：China Industrial control network
Source：China Industrial control network
Release time：2023-11-15
pageviews：0

Summary

PLC custom time countdown program design ideas

Summary

Categorize:Industry Information
Author：China Industrial control network
Source：China Industrial control network
Release time：2023-11-15
pageviews：0

Speaking of time timing is the PLC necessary instructions and program design, but if the reverse through the countdown to drive the program, but the timer is first set the time and then arrive at the time, rather than the countdown function of the operation, if you want to achieve how to operate? Next I will take you to write a design how to customize the time countdown program design.

1. Write variable scale

Enter the required symbol name based on the corresponding variable type and data type

2, design the subroutine with parameters

Step 1: (Start the countdown and input the countdown time to output the countdown marker)

Step 2: (Start the countdown and compare if the set value is less than 0 or equal to 0 do not run the countdown)

Step 3: (Press the reset button to reset the countdown time and countdown marker)

3, call the subroutine

Step 1: Call the countdown subroutine in the main program, and then fill in the external corresponding pin)

Step 2: After the countdown is complete, output Q0.0 coil by comparing instructions when the countdown time is equal to or less than 0.

Step 3: (Make the second call multiple calls, while filling in the external pin)

Step 4: (After the countdown is complete, output Q0.1 coil by comparing instructions when the countdown time is equal to or less than 0)

4. Demonstration effect

Step 1: Enter the countdown time in VW0 and press I0.0 to trigger the countdown

Step 2: Countdown time to trigger Q0.0 coil output

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Prev: STIWA presents SMALOX, a smart lock solution based on Infineon's battery-free NFC lock technology, at Europost Express 2023 in the Netherlands

Next: St is showcasing various industrial automation solutions at the Singapore International Industry Fair 2023

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