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  • MVP 2023

The onboard high speed counter resets to 0 on power up in all Unitronics PLCs and in the RC15.  If you want to retain the HSC value you must copy it continually to a buffer register in the CANbus master PLC.  Check to make sure it's not = 0 before copying it to the buffer.

You should be monitoring the online status of the RC15 in your master code.  Here's an example of how I do it:


When you see the RC15 go back online, write the value from the buffer back to the RC15.

If you want to describe your application an post both your master and your RC15 programs we can have a look.

Joe T.

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