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Support Forum for HVAC and pumping machines, Modicon M17x and EcoStruxure Machine Expert HVAC software for chillers, AHU, CRAC units for datacenters or process chillers applications - from design, implementation to troubleshooting and more, by Schneider Electric.
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Posted: 2023-02-02 07:00 AM
We have two chillers which are connected using CAN binding with TM172PDG18R controllers. I set up communication following the attached tutorial.
Both chillers have exactly the same program, so the binding table is exactly alike as defined at HVAC installer. I added some variables to both tables and at some point, I could no longer see one of the variables from PLC Node #1. Only one of them from a list of nine variables.
To make a long story short, I decided to start from scratch and followed the same procedure again from zero except that my binding table consists of only three variable now.
I can see some variables from from PLC #2 on PLC #1 but not from the PLC #1 on PLC #2.
So far I have :
1) Made sure both PLCs have the same program.
2) Made sure I downloaded the binding table to each PLC
3) Checked physical wiring. From both sides I can read 120 Ohm between + and -
I am running out of ideas actually. What else can I try ?
EDIT .....
Tried for the nth. time and it seems to be working now again. However, I did not learn what might have gone wrong. Is it likely to start failing like this or definitively I f..d up somewhere ?
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