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M221 Modbus SL Function Block Help

 
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JohnB
Junior
Junior


Joined: 09 Mar 2018
Posts: 5
PostPosted: 29/10/2018 16:03    Post subject: M221 Modbus SL Function Block Help Reply with quote
Hi guys, I am asking for help about how to configure a M221 to read from a HACH SC200 controller with 2 sensors connected via Modbus RS 485. I am finding it hard to understand how to configure what registers to read from in the Read_Var function block. I am using SoMachine basic.

For example, from the HACH pH Sensor manual:

Register# 40001, Data Type Integer, Length 1, Description Sensor meas.
Register# 40005, Data Type Float, Length 2, Description SensorTemp Meas.
Register# 40007, Data Type String, Length 6, Description Sensor Name.

I am completely new to Modbus, or anything like it, and I am just failing to grasp the concept right now

:wall: :rant:

John
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