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SIEMENS (Germany). SM331 analog input module for SIMATIC S7‑300 PLC. EOL by manufacturer, only surplus and used spare parts available on market.

Model explanation:

‑ SM331: Analog input module for S7‑300 series

‑ 7PF01: Dedicated for RTD and resistance measurement

‑ 0AB0: Hardware revision

Specification: 8 isolated RTD input channels, 40‑pin front connector for S7‑300 rack mounting. Only for RTD and resistance measurement; thermocouple, voltage and current signals are not supported.

SIMATIC S7‑300 SM331 6ES7331‑7PF01‑0AB0

Main Functions

1. 8 galvanically‑isolated RTD/resistance channels. Supports Pt100, Pt200, Pt500, Pt1000, Ni‑series, Cu10 and other RTD sensors. Compatible with 2‑wire,3‑wire and 4‑wire wiring. 4‑wire wiring minimizes cable‑resistance error. Direct resistance measurement up to 600 Ω is also available.
2. 16‑bit ADC resolution, module conversion time 50 ms. Measuring temperature range:‑200 ℃ ~ +850 ℃. Two channels per group; each group can be independently configured for different sensor types.
3. Galvanic isolation between field side and PLC backplane bus (500 V DC isolation rating) for EMC noise immunity. 24 VDC supply with reverse‑polarity protection, typical power loss 4.6 W.
4. Comprehensive diagnostics: wire‑break detection, over‑range monitoring, diagnostic interrupt to CPU. Hot‑swap supported with active backplane.
5. Converts RTD resistance values into digital data and transmits to S7‑300 CPU via backplane bus for temperature indication, PID control and thermal interlock alarm. No range card required; sensor type is selected in hardware configuration.More products: www.plcva.com

Important note: 6ES7331‑7PF01‑0AB0 is for RTD only. 6ES7331‑7PF11‑0AB0 is thermocouple‑only module, not interchangeable…

Applications

1. Multi‑point industrial temperature acquisition: Collect temperature signals from tanks, pipelines, furnaces and motor windings via Pt100 / Pt1000 sensors in chemical, power‑plant, metallurgical and water‑treatment plants.
2. Centralized temperature measurement for S7‑300 and ET200M remote I/O stations. Used for process monitoring, PID closed‑loop control and overtemperature interlock protection.
3. Spare‑part replacement for legacy S7‑300 installations. Suitable for projects requiring massive RTD temperature inputs without thermocouple or 4‑20 mA signals.
4. Acquisition of general resistance‑sensor signals.

Understand the lowest price, please contact via email: plcvarious@foxmail.com

More products: www.plcva.com

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