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We have an analog output card that'll do 8 channels of 4-20ma. There's a code snippet on the page here that shows you what the interface is like.
4 sty 2015 · I'm trying to create a simple 4-20mA current loop simulator that I can control using a potentiometer. The idea is to hook up this circuit to an Arduino and use the Arduino's analog input to read in the current loop (by converting it into a 1-5V signal using a 250 ohm resistor).
The SIM-ALP2 can simulate a 2 wire 4-20 mA loop powered device, a 4 wire 4-20mA current source without an external power supply, or a 0-10VDC signal without an external power supply. Simulating is easy in 1 mA/V or 0.1 mA/V increments by simply clicking the up and down buttons.
17 mar 2021 · Many 4 - 20 mA inputs have a 250 Ω shunt resistor to convert 20 mA to 5 V. If this is what you are dealing with then you can simulate the transmitters with a PP3 style 9 V battery, a potentiometer, a limiting resistor and a multimeter in mA mode.
The PLC Tools SIM-ALP2 Analog Simulator 4-20mA and 0-10VDC User Manual can simulate a 4-20mA 2 wire current loop, a 4-20mA 4 wire current source, and a 0-10VDC voltage source. For the most up to date demonstration of features, watch the How to Simulate a 4-20mA or 0-10VDC Analog Signal - PLC Tools SIM-ALP2 .
6 lis 2003 · Does anyone have a cheap and dirty design to simulate 4 to 20 ma 2 wire into an analog input in a PLC? Thanks.
