Siemens 6ES7921-3AA00-0AA0 SIMATIC TOP Connect Front Connector Module 36P PLC Connection Module

The Siemens 6ES7921-3AA00-0AA0 is a SIMATIC TOP Connect front connector module with flat ribbon cable connection for digital 16 I/O modules of the S7-300. Power is fed through spring-loaded terminals rated 24 V DC (up to 60 V), 1 A per contact, with 4 A total current across the 20-pole front connector.

Technical Specifications

Certifications & Standards

• cULus

Selection Notes

The spring-clamp power feed and plug-in cable interface keep field wiring on the terminal module side, so swapping the digital I/O module later does not require re-terminating the 0.25-1.5 mm2 field conductors. The 1 A per-contact rating and 4 A total current cap fit standard 24 V digital I/O signal loads; it is not sized for switching motor or actuator current directly through the connector. Choose the 20-pole front connector plus 16-pole cable interface combination specifically for 16-channel digital I/O modules on the S7-300 rack — modules with a different channel count need a different pole-count variant in the TOP Connect front connector line.