What CPUs is this module compatible with?
It is only compatible with SIMATIC S7-22X CPUs in the S7-200 series
1 actual photo shown first. Reference images are model-matched and must be confirmed before purchase.
Siemens
6ES7231-7PD22-0XA0
EM 231 Thermocouple Analog Input Module, 4 AI, ±80 mV, 15-bit
Siemens
From $313.11In stockDiscontinued
Product Description
The EM 231 analog input module is designed for SIMATIC S7-200 systems and is compatible only with S7-22X CPUs. It provides four thermocouple-capable analog inputs with a ±80 mV input range and 15-bit plus sign resolution for precise temperature measurement. Supported thermocouple types include J, K, S, T, R, E, and N, with galvanic isolation on the analog inputs to reduce noise and ensure measurement integrity. The module mounts via screw-type hardware and interfaces through the S7-200 backplane, with typical load/backplane current requirements as specified. Its compact form factor integrates cleanly into existing S7-200 installations, delivering reliable performance for industrial temperature monitoring and control applications. Dimensions and weight align with standard S7-200 I/O footprints, and the unit is part of the SIMATIC portfolio for consistent ecosystem compatibility. This module is intended as a spare part for maintaining or expanding S7-200-based thermocouple input capability.
Key Features
- •4 thermocouple analog inputs
- •±80 mV input range
- •15-bit plus sign resolution
- •Supports J K S T R E N types
- •Galvanic isolation on inputs
- •Compatible with S7-22X CPUs
- •Screw-type mounting
Buy Options
Condition, indicative price, stock, and lead time. Confirm current availability via RFQ.
ConditionPriceAvailabilityLead time
New
Price: $501.74
Availability: 254 in stock
Lead time: Ships from stock
Never Used
Price: RFQ
Availability: Sourced on request
Lead time: Quoted after RFQ
Used
Price: $313.11
Availability: 10 in stock
Lead time: ~7 day lead
Specifications
- Module type
- SIMATIC S7-200 EM 231 thermocouple AI
- Number of analog inputs
- 4
- Input range
- ±80 mV
- Supported sensors
- Thermocouples J K S T R E N
- Resolution
- 15-bit + sign
- Compatibility
- Only for S7-22X CPU
- Mounting
- Screw-type mounting
- Isolation
- Galvanic isolation analog inputs
- Power rating
- 1.8 W
- Power/Backplane current
- Backplane, Load 60 mA (per provided data)
- Dimensions
- 62 mm L x 71.2 mm W x 80 mm H
- Length
- 3.94 in
- Width
- 3.55 in
- Height
- 2.76 in
- Gross weight per pack
- 0.4100 lb / 0.19 kg
- Country of origin
- DE
- UNSPSC
- 32151705
- HTS code
- 8538903000
- Model number
- 6ES7231-7PD22-0XA0
- Part #
- 6ES7231-7PD22-0XA0
- Category
- PLCs/Machine Control
- Subcategory
- PLC Module/Rack
- Weight
- 0.35 lbs
Before we quote this part
Actual photos when available
Nameplate, condition, and visible wear can be shared before quote when stock photos are not enough.
Test notes for used units
Power-on or function test status is stated when available, with clear condition grading.
Trackable global shipping
DHL, FedEx, UPS, or forwarder options can be quoted with packing photos and tracking details.
Clear DOA boundary
For tested units, quote terms can include 7-day DOA support unless otherwise stated.
Independent sourcing disclaimer
We are not an authorized distributor, reseller, or representative of Siemens, Mitsubishi, Omron, or other manufacturers listed on this site. All product names, trademarks, brands, and logos are the property of their respective owners. Products may be used, refurbished, surplus, or sourced from the secondary market unless otherwise stated.
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FAQ
Which thermocouple types are supported?
Types J, K, S, T, R, E, and N are supported
What is the input range and resolution?
±80 mV input range with 15-bit plus sign resolution
Does the module provide isolation?
Yes, the analog inputs have galvanic isolation
What are the physical dimensions?
62 mm L x 71.2 mm W x 80 mm H (3.94 x 3.55 x 2.76 in)