John_R Posted March 6, 2019 Report Share Posted March 6, 2019 Hey All, I'm looking for opinions on using RS485 With Termination or not? (MODBUS RTU on V570). On past projects using MODBUS to talk to one or more A-B VFD's, I have turned on the termination at the PLC and let it be the "end unit". In these cases the VFD's were fairly close to the PLC. Now I'm working on a project to collect data from multiple Mass Flow Sensors via MODBUS, and the last unit will be a hundred feet or so from my PLC. I'm wondering if I should set my PLC port to no termination, and put a termination resistor on the unit furthest away? To me, this seems like the correct way to do things. (I also plan to use 3-cond w/shield MODBUS cable, and only connect shield to ground at the PLC) Right? Wrong? Indifferent? Let's hear some opinions on running long MODBUS runs..... JohnR Quote Link to comment Share on other sites More sharing options...
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