The Siemens SIMATIC S7-200 EM 231, model 6ES7231-7PD22-0XA0, is a dedicated thermocouple input module designed for seamless integration with S7-22X CPUs. This expansion module provides four isolated analog input channels optimized for Type J, K, E, N, S, T, R, and B thermocouples, delivering 15-bit resolution plus sign. With built-in cold junction compensation and programmable gain settings, it ensures stable temperature readings in applications such as furnace control, plastic molding, and HVAC systems. The module communicates via the S7-200 backplane bus, requiring no additional wiring for data exchange, and operates reliably across a -40°C to +70°C ambient range. Its rugged design meets IP20 protection standards, making it ideal for factory floor environments.
| Parameter |
Specification |
| Product Type |
Thermocouple Input Module |
| Model Number |
6ES7231-7PD22-0XA0 |
| Series |
SIMATIC S7-200 EM 231 |
| Number of Inputs |
4 (differential, isolated) |
| Input Type |
Thermocouple (J, K, E, N, S, T, R, B) |
| Resolution |
15 bits + sign (0.1°C typical) |
| Cold Junction Compensation |
Internal, automatic |
| Measurement Range (Type K) |
-270°C to +1372°C |
| Measurement Range (Type J) |
-210°C to +1200°C |
| Accuracy (at 25°C) |
±0.1% of full scale (typical) |
| Update Time |
405 ms per channel (all channels) |
| Power Supply |
24 V DC (20.4 to 28.8 V DC) |
| Power Consumption (Typical) |
1.5 W |
| Bus Current Consumption |
60 mA from S7-200 backplane (5 V DC) |
| Isolation |
500 V AC between inputs and backplane |
| Operating Temperature |
-40°C to +70°C |
| Storage Temperature |
-40°C to +85°C |
| Relative Humidity |
5% to 95% (non-condensing) |
| Protection Class |
IP20 |
| Dimensions (W x H x D) |
46 mm x 80 mm x 62 mm |
| Weight |
Approx. 120 g |
| Compatible CPUs |
CPU 222, CPU 224, CPU 226 (all revisions) |
| Expansion Capability |
Up to 7 modules per CPU (max) |
| Wiring |
Removable screw terminals, 0.5 to 1.5 mm² wire |
| Certifications |
CE, UL, cUL, FM, ATEX (for hazardous locations) |
What Does Our Clients Say
Mitsubishi MR-J4
Laura Navas
Great product!
2019/12/01
Keyence sensor
EQDR SALES
Original and fast!
2020/02/22