Siemens 6ES7231-7PD22-0XA0 Analog Input Module

Siemens 6ES7231-7PD22-0XA0 is a four-channel analog input module (EM 231) for SIMATIC S7-200 systems, intended for use with S7-22X CPUs only. It provides four analog inputs capable of accepting thermocouple signals (types J, K, S, T, R, E, N) and millivolt signals within a ±80 mV range, with a 15-bit plus sign resolution for precise measurements. The module is powered from the S7-200 backplane at 5 V DC, drawing up to 87 mA. The EM 231 expands the S7-200’s analog sensing capabilities for temperature measurements and millivolt monitoring in compact control panels. Common applications include temperature acquisition in industrial processes and small-scale automation tasks that require direct thermocouple or millivolt inputs, with four channels helping minimize wiring complexity and cabinet space.