Specifications Main product range Modicon M171/M172 product function Programmable controllers specific application HVAC product and pumping solution variant Programmable Total inputs/outputs 28 number of logic inputs 8 number of digital outputs 1 for SPDT relay outputs with independent common 3 for SPST relay outputs with identical common 2 for SPST relay outputs with identical common 2 for SPST relay outputs with independent common digital output current 1 A for SPDT relay 3 A for SPST relay number of analog inputs 8 configurable per pair analog output number 2 voltage, range: 0...10 V 2 voltage/current, range: 4 to 20 mA or 0 to 10 V or MID (2 kHz)