MODULE 6ES7231-7PD22-0XA8 6ES7 231-7PD22-0XA8 6ES7231-7PD22-OXA8

Siemens 6ES7231-7PD22-0XA8 SIMATIC S7-200 CN Analog Input EM 231

Overview

The 6ES7231-7PD22-0XA8 is a SIMATIC S7-200 CN Analog Input EM 231 module. Siemens identifies it as a module only for S7-22X CPU, with 4 analog inputs, support for ±80 mV and thermocouple signals, and 15 bit + sign resolution. Siemens product information also lists the supported thermocouple types as J, K, S, T, R, E, and N, while noting that the module has typical power loss of 1.8 W.

This module is dedicated to low-level voltage and thermocouple measurement. Siemens does not list it as a current-input module, resistance-thermometer module, or resistance-input module. That input profile is one of its defining characteristics and one of the most important points to preserve in replacement work.

Technical Data

The table above reflects Siemens product information and Siemens-linked datasheet content for this exact EM 231 model.

Application Value

This module fits temperature acquisition and low-level analog measurement in S7-200 systems that use S7-22X CPUs. Its 4-channel structure and thermocouple support make it suitable for compact control panels where multiple temperature signals must be brought into the PLC without moving to a larger control platform.

Its published signal profile is specific and clear: voltage and thermocouple input are supported; current, resistance thermometer, and resistance input are not. That makes it appropriate where the original application depends on this exact measurement type.

Selection Notes

For selection, the most important points are S7-22X CPU compatibility, the 4-channel input count, the thermocouple/±80 mV signal profile, and the 15 bit + sign conversion format. These are the characteristics that distinguish this EM 231 version from other analog modules in the S7-200 family.

FAQ

Q1: What kind of module is 6ES7231-7PD22-0XA8?
It is a SIMATIC S7-200 CN Analog Input EM 231 module. Siemens defines it as a 4-channel analog input module for S7-22X CPUs, with ±80 mV and thermocouple input capability. It is not a mixed analog I/O card and not a current-input module.

Q2: What input signals does this module support?
Siemens specifies this model for voltage input and thermocouple input. It does not support current input, resistance thermometer input, or resistance input. The supported thermocouple types are J, K, S, T, R, E, and N.

Q3: Why is the exact signal type important on this model?
Because this module is built around a specific measurement profile. If the installed application uses thermocouples or ±80 mV low-level signals, then the replacement should keep that same input class. That is one of the most important checks when selecting an analog spare module.

Q4: What does 15 bit + sign resolution mean here?
It is Siemens’ published conversion format for this module. That specification defines the analog conversion class used by the EM 231 and is part of the module’s identity for thermocouple and low-level analog measurement.

Q5: What should be checked before ordering?
Check the installed part number, confirm that the CPU is in the S7-22X class, verify the need for 4 analog inputs, and make sure the installed application requires thermocouple / ±80 mV input, not current or resistance-based measurement. Those are the main compatibility points for this model.