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Yes, the Modbus RTU Serial Driver can communicate with Moeller PS4 PLCs (such as PS4-151, PS4-201, or PS4-341). To communicate with a Moeller PS4 PLCA, use the ZB4-501-UM3 or ZB4-501-UM4 serial interface converter (hardware) and the S40-AM-K4-D/GB application module (PLC software).