Chris B Posted January 22, 2013 Report Share Posted January 22, 2013 Hi Has any one tried to connect a V1210 via modbus to a procon electronics PMDAIO I/O module. I have wired comms working ok but cant find the correct register locations in the PMDAIO. Any ideas ? Cheers Chris Quote Link to comment Share on other sites More sharing options...
MVP 2014 Simon Posted January 23, 2013 MVP 2014 Report Share Posted January 23, 2013 I have pulled up the manual, and it includes a list of registers. There is quite a selection, since the PMDAIO has digital and analogue signals. However since the module is configurable via jumpers, that may change the mapping. I haven't read that deeply. Make sure you are using the right Modbus function type for the I/O point you are accessing. The PMDAIO manual should spell this out also. It can seem intuitive to use the "Read Inputs" and "Read Input Registers" since you are dealing with an I/O module. But not all vendors follow that type of logic. Check whether you need to use the "Read Inputs" (code 2) function or the "Read Coils" (code 1) function for digital inputs. Likewise analogue can either use "Read Input Register (code 4) or "Read Holding Register" (code 3). Product Page Link Direct PDF Download Link These comments are a bit fragmented, but hopefully something will be helpful. Quote Link to comment Share on other sites More sharing options...
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