Description
SM 331 Ex (8AI) — Analog I/O
Siemens · SM 331 Ex (8AI) · 6ES7331-7SF00-0AB0
Description
The SM 331 Ex is an 8-channel analog input module for the S7-300 PLC rated for use with intrinsically-safe field circuits in hazardous (Ex) areas, providing built-in isolation/barrier functions so field transmitters in Zone 0/1 classified areas can be wired directly without external Zener barriers.
Key specifications
Parameter | Value |
Function | Intrinsically-safe analog input module, 8 channels, S7-300 |
Channels | 8 AI, Ex-rated (intrinsically safe field circuits) |
Hazardous area rating | Suitable for Ex Zone 0/1 field wiring (per SM331 Ex family; verify exact certificate/marking) |
Signal types | Current/voltage/RTD per channel-group configuration (per family) |
Isolation | Intrinsic safety barrier integrated on-module |
Mounting | S7-300 rack, standard signal-module slot |
Reference
Field | Value |
Manufacturer (OEM) | Siemens |
Model | SM 331 Ex (8AI) |
Part number | 6ES7331-7SF00-0AB0 |
Category | Analog I/O |
System family | SIMATIC S7-300 Ex |
GT stores quantity | 51 |
Data confidence | medium |
Manuals filed (007 - Manuals)
- Specs Input Module SM331.pdf — SM 331 module family specification sheet; covers standard and Ex variants
Notes
Ex-rated variant confirmed via the 6ES7331-7SF00 order number suffix (7SFxx = Ex-certified SM331 family), but the exact hazardous-area certification/zone marking should be verified against the physical module's certification label before use in a safety-relevant application.
Source: Sohar 1 DCS field-component stores inventory (Total GT_BOP). Filed in the AI HW Knowledge Base.