Siemens 6ES7231-7PF22-0XA0 EM231 Analog Input Module

8-Channel Thermocouple Input Module for SIMATIC S7-200

The 6ES7231-7PF22-0XA0 functions as an analog input module, specifically the EM231 model for the SIMATIC S7-200 PLC series. This module provides eight analog input channels that measure voltage and thermocouple signals from various sensors. It converts these signals into digital values with a 15-bit plus sign resolution, delivering high-precision data to the CPU. For this reason, the module excels in temperature monitoring and process control applications. Moreover, its compatibility with multiple thermocouple types makes it a versatile choice for diverse industrial settings.

Technical Specifications

The table below details the key technical parameters for the 6ES7231-7PF22-0XA0 analog input module.

Parameter	Specification
Manufacturer	Siemens
Product Type	Analog Input Module (EM 231)
Series	SIMATIC S7-200
Input Channels	8 analog inputs
Input Signal Types	+/-80 mV and thermocouples (J, K, S, T, R, E, N)
Resolution	15 bit + sign
Backplane Current Draw	87 mA at 5 V DC
Load Voltage Current Draw	60 mA at 24 V DC
Power Loss	Typ. 1.8 W
Update Time	810 ms (all channels)
Galvanic Isolation	Yes, between the inputs and MANA
Dimensions (W x H x D)	71.2 mm x 80 mm x 62 mm
Weight	Approx. 0.17 kg
Status Indicators	External fault EXTF (red), Group error SF (red)

Integration and Application

The 6ES7231-7PF22-0XA0 integrates directly into the S7-200 system, and it is exclusively compatible with the S7-22X CPUs. Please note that this module is a spare part, and Siemens no longer actively produces it. The module features a cold-junction compensation function that ensures accurate thermocouple readings across varying ambient temperatures. For reliable signal transmission, the maximum shielded cable length to the sensor is 100 meters. Therefore, this module suits demanding automation tasks that require precise temperature measurement. Furthermore, its compact dimensions and low weight simplify cabinet installation.