modbus hmi modbus tcp reads from a wago 750

ganutenator

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• Dec 24, 2018

• #1

Probably something simple, but my project hmi (schneider mounts in a button hole hmi) doesn't seem to be able to read or write to my wago plc.

The plc and hmi project was developed in So Machine and I translated the so machine into codesys for the wago 750 (tough job, I know, right). So I expected the hmi to at least be able to read or write to something.

 

cottagewood

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• Dec 26, 2018

• #2

What addresses are you trying to write to? Holding Register Word 0 in the PLC = 12288 in the HMI

 

ganutenator

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• Dec 26, 2018

• #3

cottagewood said:

What addresses are you trying to write to? Holding Register Word 0 in the PLC = 12288 in the HMI

Click to expand...

thanks!
That worked.
why the offset?
More importantly, If I want to read %MX0.15? Would that be %MW12288.15?

I assume the offset may have something to do w/ registers allocated for I/O?

 

cottagewood

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• Dec 26, 2018

• #4

It comes from this table

Your syntax for bool is correct

 

ganutenator

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• Dec 26, 2018

• #5

you totally saved my but today at work btw!

 

ganutenator

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• Dec 26, 2018

• #6

I was tasked w/ evaluating the schneider m251 w/ so machine vs the wago 750-852? w/ codesys.
Wago totally won via dif. from to ports on the port forwarding (aka multiple machines at one site), 0-15 bool vs scheider's 0-7 bool thingy.