Siemens 6ES7 231-0HC00-0XA0 Analog Input Module

The Siemens 6ES7 231-0HC00-0XA0 is a three-channel analog input module (EM231) for the SIMATIC S7-200 family, delivering 12-bit conversion per channel for moderate accuracy in DC sensor readings. It is a non-isolated input module that mounts in S7-200 CPU racks and is powered from a 24 V DC supply, typically specified as 20.4 to 28.8 V, aligning with Class 2 power limits. Each of the three inputs accepts DC signals from sensors and transducers, enabling straightforward interfacing to common process signals such as temperature, pressure, or level sensors when used with compatible Siemens controllers. The EM231’s compact three-channel, 12-bit design provides a simple, economical solution for digitizing analog information in small to mid-size automation projects, complementing digital I/O with reliable, industry-standard Siemens hardware. As part of the S7-200 ecosystem, it integrates with Siemens programming and diagnostics workflows, enabling consistent configuration, wiring, and troubleshooting across EM-series modules.