How do you realize a sensor range of 4mA to 20mA with an analog module EM231 or EM235?
Use the DIP switches to configure a sensor range of 0mA to 20mA. Wire the sensor as shown in Fig. A-12 (Channel D) in Appendix A of the SIMATIC S7-200 Programmable Controller System Manual (Entry ID 1109582). Connect L+ of the power supply to the sensor's plus connection. Connect the sensor's minus connection to RD and D+. Connect all of the ground connections M together and connect them to D-.
When using a 4mA to 20mA sensor, you must convert the measured value accordingly. A sample program with explanations is available as Tip 38a in "Tips&Tricks S7-200" in Entry ID 1232912.
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