Ask our team:
  • Phone: +86 181 0690 9650
  • E-Mail sales1@apterpower.com
How We Verify Your Order
Before dispatch, we confirm the exact model, revision, condition, inspection requirements and shipping documents for your order.
See a real on-site verification case >>
  • Lifecycle status

    Active / Available from OEM
    Apter Power provides 6ES7921-5AH20-0AA0 quotations, product manuals, and model-matching support.

6ES7921-5AH20-0AA0

/ 4.9
1001 reviews | Need a Specific Revision?
Siemens 6ES7921-5AH20-0AA0 is a SIMATIC Top connect front connector module with four 16-pole IDC interfaces for 32-channel S7-1500 digital I/O modules.
In Stock
Ships by Saturday, November 14
Fast Shipping Available
Get a quick price for 6ES7921-5AH20-0AA0
Quantity
*E-mail
Company
*Mobile
*Content
Upload (gif, jpg, jpeg, png, bmp, doc, docx, xls, xlsx, ppt, pdf, csv)

Technical specifications for 6ES7921-5AH20-0AA0

  • Manufacturer:
    Siemens
  • Part Number:
    6ES7921-5AH20-0AA0
  • Product Family:
    Siemens Simatic S7-1500
  • Product Type:
    SIMATIC S7-1500 Front Connector Module
  • Stock:
    1
  • Assigned I/O:
    32-channel digital modules
  • Module Interface:
    40 poles
  • IDC Interfaces:
    4 x 16 poles
  • Rated Operating Voltage:
    24 V DC
  • Maximum Contact Current:
    1 A
  • Maximum Total Current:
    2 A, horizontal installation
  • Supply Terminals:
    4 x L+ and 4 x M
  • Supply Connection:
    Push-in
  • Maximum Cable Length:
    30 m
  • Flexible Conductor Range:
    0.25 to 1.5 mm²
  • Operating Temperature:
    0 to +60 °C
  • Storage and Transport Temperature:
    -40 to +70 °C
  • Weight:
    0.187 lbs (0.085 kg)
  • Estimated shipping dimensions:
    5x13.3x3.4cm
  • Tariff Code:
    8536699000
  • Country of origin:
    Romania
  • Place of shipment:
    Xiamen,Fujian,China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals IDC Layout Supply Path Current Limits Wiring

Features:

  • A 40-pole S7-1500 interface fans out to four 16-pole IDC cable connectors.
  • Four L+ and four M push-in terminals distribute the 24 V DC field potential.
  • A 2 A total limit and 30 m cable boundary define the installed connection path.
Siemens 6ES7921-5AH20-0AA0 separates channel cabling from the removable S7-1500 I/O module.

The IDC connectors carry digital channel conductors while the push-in terminals carry field potential.

Correct module seating, cable identity, and L+/M distribution preserve channel mapping.

The Siemens 6ES7921-5AH20-0AA0 SIMATIC S7-1500 Front Connector Module may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
Siemens 6ES7921-5AH20-0AA0 S7-1500 Front Connector Module Manuals,Datasheets,Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.

Four Cable Interfaces

  • Module side: A 40-pole interface mates with the S7-1500 I/O module.
  • Cable side: Four 16-pole IDC connectors carry the channel conductors.
  • Assignment: Each cable position must match the documented channel group.
  • Length: The cable path to a terminal module is limited to 30 m.

L+ and M Distribution

  • Positive terminals: Four L+ points distribute the 24 V DC potential.
  • Reference terminals: Four M points provide the corresponding reference.
  • Connection: The supply conductors use push-in terminals.
  • Separation: Supply terminals and IDC channel conductors perform different roles.

Contact and Module Loading

  • Per contact: Each contact path is rated at 1 A.
  • Total: Horizontal installation permits 2 A total module current.
  • Voltage: The rated operating voltage is 24 V DC.
  • Check: Add all connected current paths before commissioning.

Push-in Conductor Preparation

  • Flexible range: Flexible conductors may be 0.25 to 1.5 mm².
  • Stranded range: Stranded conductors may be 0.5 to 1.5 mm².
  • Strip length: Prepare 8 mm of stripped conductor.
  • Retention: Verify every conductor with a gentle pull test.
Description
Siemens 6ES7921-5AH20-0AA0 is a fully modular SIMATIC Top connect front connector module for 32-channel S7-1500 digital I/O modules. Its 40-pole module interface converts the I/O position into four 16-pole IDC cable connections.

Field potential enters 6ES7921-5AH20-0AA0 through push-in supply terminals arranged as four L+ and four M connections. These terminals distribute the 24 V DC supply while the IDC interfaces carry the assigned digital channel conductors.

Each contact path in 6ES7921-5AH20-0AA0 is rated at 1 A, while the complete module carries a maximum total current of 2 A in horizontal installation. Cable length between the front connector module and terminal module is limited to 30 m.

The direct-mount housing of 6ES7921-5AH20-0AA0 accepts flexible conductors from 0.25 to 1.5 mm² at the push-in supply points. Operation is specified from 0 to +60 °C, with storage and transport from -40 to +70 °C.
Alternative Names
6ES79215AH200AA0 6ES7921 5AH20 0AA0 6ES7 921 5AH20 0AA0 Siemens 6ES7921-5AH20-0AA0 6ES7921-5AH20-0AA0 S7-1500 Front Connector Module 6ES7921-SAH20-0AA0 6ES7921-5AH2O-0AA0 Siemens 6ES7921 5AH20 0AA0
Technical notes
For Siemens 6ES7921-5AH20-0AA0, verify the 32-channel module assignment, 40-pole seating, four IDC cables, L+/M distribution, conductor size, and total current.
Exceptional Service

Our Mission

  • 100% Satisfaction

    We believe expertise is priceless. With over 20 years of experience, and top engineers on staff, we can help you solve or avoid problems that threaten your business.
  • Trust Guaranteed

    Not only do we have a vast inventory, our team makes sure every piece of equipment is in working condition. Your purchases are also backed by our Warranty.
  • Expertise

    Time is money, especially when your equipment is down. We work quickly to get your equipment on its way so you can get it back up and running.

FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
Why does an S7-1500 channel map incorrectly through Siemens 6ES7921-5AH20-0AA0?
Check Siemens 6ES7921-5AH20-0AA0 40-pole seating, IDC connector positions, cable labels, terminal-module mapping, and hardware configuration.
How many IDC connections are on Siemens 6ES7921-5AH20-0AA0?
Siemens 6ES7921-5AH20-0AA0 has four 16-pole IDC cable interfaces.
Why does field voltage fail after wiring Siemens 6ES7921-5AH20-0AA0?
Verify Siemens 6ES7921-5AH20-0AA0 L+/M polarity, push-in retention, supply source, terminal assignment, and total current.
What total current is allowed through Siemens 6ES7921-5AH20-0AA0?
Siemens 6ES7921-5AH20-0AA0 permits a maximum total current of 2 A in horizontal installation.
Can Siemens 6ES7921-5AH20-0AA0 use a cable longer than 30 m?
No. Siemens 6ES7921-5AH20-0AA0 is specified for a maximum 30 m connection to the terminal module.
What should be checked before fitting Siemens 6ES7921-5AH20-0AA0?
Confirm Siemens 6ES7921-5AH20-0AA0 I/O-module assignment, connector orientation, cable labels, L+/M wiring, conductor preparation, and current load.