6ES7921-3AH00-1AA0

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The front connector is available in two designs

The 20-pole front connector contains:

• 20 connections for crimp contacts for connecting the wiring
• Strain relief for the cables
• Unlatching key; for unlatching the front connector when replacing the module
• Holder for coding element attachment; there are two coding elements with attachments on the modules. The attachments latch in when inserting into the front connector for the first time.

The 40-pole front connector contains:

• 40 connections for crimp contacts for connecting the wiring
• Strain relief for the cables
• Locking screw; for fixing and detaching the front connector when the module is replaced
• Holder for coding element attachment; there is a coding element with an attachment on the modules. The attachment latches in when inserting into the front connector for the first time.