Multilin 850 modbus in RSLogix

[cstep7263]

Anyone know how to bring modbus data from GE Multilin 850 the correct way? None of the registers are lining up and data is coming in with values not looking correctly. There got to be an easier way.

 

[OkiePC]

Well if you are getting successful communications then you have it 2/3 whipped! Now you may be "off by 1" on the data addressing and/or need to word swap any registers that are long or floats (32 bits).

Here's an article that I skimmed that covers both of these common stumbling blocks.

Modbus Tutorial from Control Solutions

 

[cstep7263]

Well if you are getting successful communications then you have it 2/3 whipped! Now you may be "off by 1" on the data addressing and/or need to word swap any registers that are long or floats (32 bits).

Here's an article that I skimmed that covers both of these common stumbling blocks.

Modbus Tutorial from Control Solutions

Thank you for responding

 

[rootboy]

Well if you are getting successful communications then you have it 2/3 whipped! Now you may be "off by 1" on the data addressing and/or need to word swap any registers that are long or floats (32 bits).

Here's an article that I skimmed that covers both of these common stumbling blocks.

Modbus Tutorial from Control Solutions

Man, you've got that right! How you been, Okie?

 

[rootboy]

Thank you for responding

Posting examples of what you sent vs what you received might help us to figure where it is getting tripped up at. BTW, this is a pretty common Modbus issue, But like OkiePC said, you've got 2/3rd's of it whipped.

And I always recommend using "middleware", at least during setup and troubleshooting, to remove any of the vagrancies of the receiving end. I downloaded this today: Rilheva Modbus Poll FREE Modbus RTU | Rilheva IIoT Platform I've no experience with it, but the price was right.