PaulZ Posted January 29, 2019 Report Share Posted January 29, 2019 Good day all, I recently got a SM43 controller to create a control system for air compressors. The issue I have currently with the input is a bit "strange" to me. I have configured AN0 as a 4 - 20 mA input, and connected a current loop simulator / generator to the unit as per diagrams included with the PLC. Since I am using a 2 wire transmitter / simulator I connected + of the simulator to the +24V and the - of the simulator to the AN0 (pin 9) of the PLC. What I am getting is very erratic jumping between 0 and about 90% on the reading. I tried it with a Druck UPS-II loop calibrator and a Fluke 787 in simulate mode, both with the same result. My loop calibrator keeps on indicating "Loop", which points to an open loop, and my Fluke doesn't show any current flowing. To me it almost looks like the input is set for 0 - 10 V instead, and a protection circuit is kicking in and out... I am using Visilogic 9.8.65 Build 0. The latest "Beta" version my company's IT department doesn't want to install because it is labeled "Beta".... What am I doing wrong...? What is the solution 🙂 ? Thanks Paul Quote Link to comment Share on other sites More sharing options...
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