Posted: 9/16/2015 9:33:49 PM EDT
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Any automation guys in here? I have a question about talking to a device via Modbus. I'll wait to see if anybody's in here before writing it all out LOL.
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OK so here we go. I'l be using a "Click" PLC as a master, and a humidity sensor unit will be the one and only slave on channel 1.
The Modbus register map, as provided by the sensor manufacturer, is below. My question is, how do I harvest the data in the first 5 fields and dump it into PLC memory that I can then manipulate, display, and log? Once I get it into PLC memory, I'm good. I assume I use the "receive" command at the appropriate time? I guess I'm a little confused about the "logical address" and the "PDU address" and how they are used, what they mean. 
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