Control digital output (%QX0.x) at specific times

CODESYS
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1

Hi,

I (newbie) am looking for a simple way in eCockpit using structured text to read the system time and switch a digital output (DO) every 3 hours at specific times.
I’ve read several forum posts regarding GetLocalTime and similar calls, but I can neither follow nor copy them because something always seems to be missing. Could one of you please guide me step by step and explain the tricky parts?
I’m using a WAGO PFC200 8212, Codesys V3.5 SP16 Patch 3, Compiler 3.5.16.32.

Thanks in advance!

2

Hi,

with WagoAppTime Library you should be able to retrieve the Systemtime from the Controller.

Result is the DT Datatype.

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to create a Signal every 3 Hours you could use several ways to evaluate timestamps.

for example Evaluate Difference between Timestamps

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due to your needs you can also use WagoAppScheduler.
There are many options for Scheduler Functions to use within the Controllers.

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For Example. Use the FbScheduler with Multiple typSpecialPeriod Configurations every 3 Hours.