Siemens 6ES7921 Series Front Connector for Use with Digital I/O modules

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RS Stock No.:
282-3307
Distrelec Article No.:
302-64-218
Mfr. Part No.:
6ES7921-5CB20-0AA0
Manufacturer:
Siemens
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Brand

Siemens

Accessory Type

Connector Module

Product Type

Front Connector

Series

6ES7921

For Use With

Digital I/O modules

Hazardous Area Certification

No

Standards/Approvals

No

COO (Country of Origin):
RO

Siemens 6ES7921 Series Front Connector, For Use With Digital I/O modules - 6ES7921-5CB20-0AA0


This front connector provides a modular connection Interface for Siemens S7-1500 digital I/O arrangements, offering a Compact means to link module wiring to the control system. It is intended for direct mounting on compatible I/O modules and supplies the potential feed via screw terminals, operating within typical industrial ambient temperatures.

Features & Benefits


• 24V DC rated operating voltage for standard PLC supplies
• Maximum continuous current 1A per contact to protect channels
• Total current capacity 2A for horizontal mounting arrangements
• 50‑pole IDC Interface for high‑density signal routing
• Screw‑type supply terminals with 3.5mm blade compatibility
• Operating temperature range 0 to 60°C for on‑site reliability

Applications


• Suitable for connecting digital module cable looms to S7‑1500 racks
• Used with PLC systems requiring discrete I/O channel aggregation
• Ideal for retrofit of control panels needing modular front connections
• Can be used for internal system potential distribution via screw terminals

How many conductors can be connected per supply terminal?


Each supply Terminal accepts a combination of one or two conductors until the summed cross‑section limit is reached, with stripped length 10 mm.

What conductor types and sizes are supported for signal wiring?


The connector supports flexible and finely stranded conductors 0.5 to 2.5 mm², and core end processed conductors 0.25 to 1.5 mm² with end sleeves per DIN 46228.

Is there a restriction on cable run length between this module and the Terminal module?


The maximum wire length between the front connector module and the Terminal module is 30m.

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