curtharrington Posted August 12, 2014 Report Share Posted August 12, 2014 Hi all, I put together a project with a v570 controller and a E3XB snapin module. I have two anaolg inputs (AI1 & AI2). AI1 has a loop powered signal for a pressure transducer hooked up and AI2 has a self powered signal coming from a pH meter hooked up. We noticed that the two inputs seemed to not play well with each other because when they were both hooked up the pH meter reading would come in at less than 3.4mA. It seemed like they were fighting with control of the refernce ground so we installed a signal isolator that takes a 0-10V (all we had at the time). The customer is complaining that the value on the meter doesn't match up to the value displayed on the PLC and this has to do with converting the 4-20mA (only option for retransmission). If we can, we would like to eliminate the signal isolator. Any input would be greatly appreciated, thank you Quote Link to comment Share on other sites More sharing options...
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