Siemens 6ES7131-7RF00-0AB0 SIMATIC ET 200iSP 8DI NAMUR Ex Electronic Module

The Siemens 6ES7131-7RF00-0AB0 is a SIMATIC electronic module for the ET 200iSP system with 8 NAMUR digital inputs rated Ex ib [ia Ga] IIC T4 Gb for Zone 1 gas and Zone 21 dust hazardous areas, built-in frequency measurement, and wire-break/short-circuit diagnostics per channel. It runs from a 20.4-28.8V DC supply and mounts on rail or front panel.

Technical Specifications

Certifications & Standards

• GL
• ABS
• BV
• DNV

Selection Notes

The Ex ib [ia Ga] IIC T4 Gb rating covers Zone 1 gas and Zone 21 dust areas, and the module carries a separate I M2 Ex ib [ia] I Mb marking for mining (Mb) service, so it is the ET 200iSP module to pick when the DI signals originate inside the classified zone itself rather than in a safe area feeding intrinsically safe barriers. Two of its eight channels can be configured as frequency meters (50ms/200ms/1s gate time) or two as counters up to 5kHz, useful for NAMUR flow-sensor totalizing without a separate counting module. Screw/spring-type terminals and a 30 x 129 x 136.5 mm housing, larger than the non-Ex ET 200SP DI modules, reflect the added Ex(i) circuitry and mounting requirements for hazardous-area service.

Applications

Reads NAMUR proximity and flow sensors installed directly in ATEX Zone 1/21 or IECEx-classified process areas - tank farms, refineries, chemical plants - where the I/O module itself, not just the sensor, must carry intrinsic-safety approval.