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Why can't I read PM2000 series meters registers correctly in Machine Expert Basic?

Published date: 15 January 2021

Issue:
Why can't I read PM2000 series meters registers correctly in Machine Expert Basic?

Environment:
Machine Expert Basic
Modicon M2xx 
PowerLogic PM2000 series meters

Resolution:
This can be due to the reason that the meter sends the registers in reverse order than what Machine Expert is trying to comprehend.

The meter sends in a Big Endian (ABCD) format, while Machine Expert reads as Mid-Little Endian (CDAB).

One way to solve this issue, you can reverse the words in Machine Expert and assign them to different MD/MF. In the screenshot, you can see a concatenate function to reverse the %MW1 before the %MW0, and assigned them to %MD10. Now, %MD0/%MF0 are reading the two words in reversed format, while %MD10/%MF10 are reading in proper format.

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