Siemens 6ES7921-5CK20-0AA0 SIMATIC TOP connect Front Connector S7-1500 Analog 50-Pole PLC Connection Module

The Siemens 6ES7921-5CK20-0AA0 is a SIMATIC TOP connect front connector module for analog I/O modules with a 40-pole layout on the S7-1500. It carries a single 50-pole IDC connector for the field cabling, with power supplied through the module's own infeed element rather than dedicated screw or push-in terminals, rated 24 V DC.

Technical Specifications

Certifications & Standards

• cULus

Selection Notes

Unlike the digital I/O connectors in this series, this module has no separate power screw or push-in terminals — potential supply passes through the analog module's own infeed element, which matches how S7-1500 analog cards distribute their low-current sensor/actuator supply internally. The 50-pole IDC connector gives a single-cable link to the terminal module for the analog card's 40-pole signal set. Use the digital-I/O front connector modules in this series instead for switching I/O, where a dedicated L+/M screw or push-in feed is required.