Siemens 6ES7231-7PB22-0XA8 Analog Input Module

The Siemens 6ES7231-7PB22-0XA8 analog input module (EM 231) provides two RTD-capable analog inputs for SIMATIC S7-200 CN, designed to operate with S7-22X CPUs. The EM 231 accepts Pt100/200/500/1000/10000 and Ni100/120/1000 resistance temperature detectors, with input impedance selectable to 150, 300, or 600 ohms, giving two independent channels for precise RTD temperature sensing in compact DIN rail installations. Each channel features 15-bit plus sign resolution and a typical power consumption of about 1.8 W, making it suitable for space- and energy-conscious automation panels. Its physical footprint measures 71.2 mm in width, 80 mm in height, and 62 mm in depth, enabling straightforward integration into existing S7-200 CN cabinets. The module is CE-certified and explicitly specified as compatible with S7-22X CPUs only, reinforcing its role as a targeted temperature-input option within the S7-200 CN family.