The modules serve the connection of input logic signals and ensure galvanic isolation and fault filtering. The logic levels of the input signals are signalised by the green LED diode on the front plate of the unit

• connection of 16 logic AC input signals 230 V AC
• the inputs are arranged in two sets if eight with common pole
• galvanic isolation from PLC circuits
• the input connector is equipped by a removable screwless-type or screw-type terminal block, as per customer's order with 20 terminals for conductors with a cross-section of 2,5 mm2
• 1 module 30mm in TC700 rack

For more see Datasheet, Basic Documentation