6ES7331-7PF11-0AB0 Siemens Analog Input SM 331 SIMATIC S7-300 8 AI Thermocouples

6ES7331-7PF11-0AB0 Siemens Analog Input SM 331 SIMATIC S7-300 8 AI Thermocouples

1. Product Overview
The 6ES7331-7PF11-0AB0 is an analog input module with electrical isolation, designed for direct insertion into any S7-300 controller slot. Each channel group can be configured with 8 differential inputs, supporting thermocouple types B, E, J, K, L, N, R, S, T, TXK/TXK(L), as well as voltages from ±80 mV to ±25 V, currents from ±3.2 mA to ±20 mA, and resistances of 2/3/4-wire Pt100…Pt1000, Ni100…Ni1000, Cu10, and 0 Ω…6 kΩ. With 16-bit resolution, programmable linearization, internal/external temperature compensation, and sensor drift monitoring, it delivers laboratory-grade accuracy directly on the PLC backplane.

2. Key Technical Specifications
- Rated Supply Voltage: 24 V DC (with reverse polarity protection)
- Electrical Isolation: 500 V DC between channels, backplane, and load power supply
- Update Rate: ≤ 55 ms per channel (programmable smoothing filter)
- Diagnostic Indicators: Fault indicator, channel status indicator, limit alarm indicator
- 8 channels with hardware interrupt capability (configurable upper and lower limits)
- Front Panel Connector: 40-pin screw-type, detachable
- Dimensions (W x H x D): 40 mm x 125 mm x 120 mm; Weight: approx. 272 ​​g
- Operating Temperature: 0…+60 °C; Vertical Installation: 0…+40 °C
- Printed Circuit Board: CE, cULus, ATEX (Zone 2, Class 3) certified

3. Typical Applications
- Multi-zone plastic extruder barrels
- Glass, ceramic, and steel heat treatment furnaces
- Pharmaceutical autoclaves and CIP/SIP systems
- Food and beverage batch heaters and pasteurizers
- Engine/propulsion test chamber temperature control
- HVAC and cleanroom systems
- Battery assembly and environmental test chambers

4. Technical Advantages
- One module replaces up to 8 single-channel signal converters – saving panel space and wiring costs
- Measurement type for each channel group selectable via software; no DIP switches or jumpers required
- Internal cold junction compensation, no external cold junction compensator needed
- Integrated scaling and limit monitoring functions, reducing CPU load and cycle time
- Module and channel diagnostic information accessible via standard SFC 51/59 function blocks – ideal for predictive maintenance and industrial IoT data lake applications
- Compatible with all S7-300 series CPUs (from CPU 312 IFM to CPU 319-3 PN/DP) and IM 153-1/153-2 interface modules for ET 200M distributed I/O systems

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