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6ES7921-5CK20-0AA0

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Siemens 6ES7921-5CK20-0AA0 is an S7-1500 analog front connector module used to connect the module's 40-pole interface to a 50-pole TOP connect IDC cable.
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Technical specifications for 6ES7921-5CK20-0AA0

  • Manufacturer:
    Siemens
  • Part Number:
    6ES7921-5CK20-0AA0
  • Product Family:
    Siemens Simatic S7-1500
  • Product Type:
    S7-1500 Analog Front Connector Module with 1x50-Pole IDC Interface
  • Stock:
    1
  • Supply Voltage Type:
    DC
  • Rated Supply Voltage:
    24 V
  • Permissible Supply Range:
    20.4 to 28.8 V DC
  • Maximum Current per Plug-In Contact:
    1 A
  • Permissible Operating Temperature:
    0 to 60 °C
  • Maximum Connecting Cable Length:
    30 m
  • Front Connector Contact Count:
    40 poles
  • IDC Cable Contact Count:
    50 poles
  • Terminal Position:
    Top
  • Mounting Method:
    Direct mounting
  • Pollution Degree:
    2
  • Overvoltage Category:
    II
  • Weight:
    0.2183 lbs (0.099 kg)
  • Estimated shipping dimensions:
    5.00x13.30x3.40cm
  • Tariff Code:
    85369010
  • Country of origin:
    Germany
  • 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 Analog Signal Routing Connector Mapping Supply Handoff Commissioning Checks

Features:

  • Connects a supported S7-1500 analog I/O module to one 50-pole TOP connect cable.
  • Preserves the documented channel-to-conductor mapping without changing the analog signals.
  • Uses a separate infeed arrangement for the supply path required by the connected module.
The front connector module is the first element in a prefabricated analog wiring chain.

Its fixed circuit map carries each module contact to the matching IDC conductor.

Selection therefore depends on the exact analog I/O module and the downstream 50-pole TOP connect component.

The Siemens 6ES7921-5CK20-0AA0 S7-1500 Analog Front Connector Module with 1x50-Pole IDC Interface may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
Siemens 6ES7921-5CK20-0AA0 S7-1500 Analog Front Connector Module with 1x50-Pole IDC Interface 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.

Following analog conductors from the S7-1500 module into the IDC cable

  • Module contacts: The 40-pole front connection receives the analog channel terminals.
  • Fixed mapping: Internal conductors assign every module contact to a defined IDC position.
  • Cable handoff: The 50-pole interface continues those signals into the prefabricated cable.
  • No conversion: Voltage, current, RTD or thermocouple behavior remains the responsibility of the I/O module.

Keeping channel order consistent across the complete wiring chain

  • Published diagram: The circuit drawing identifies each front-contact to IDC-contact relationship.
  • Channel labels: Project wiring records should use the same channel numbering as the connected module.
  • Cable orientation: The keyed IDC connector establishes the correct contact sequence.
  • Terminal destination: The downstream TOP connect component must use the matching 50-pole assignment.

Separating power infeed from the analog signal conductors

  • Infeed element: The documented supply enters through the designated connector arrangement.
  • Reference potential: Analog reference conductors retain their assigned positions in the circuit map.
  • Current limit: Each plug-in contact stays within the documented continuous-current value.
  • Shared enclosure: Power and signal paths are mechanically combined without changing their electrical duties.

Proving the complete analog connection one channel at a time

  • Part match: Confirm the exact S7-1500 analog module, connector module and cable combination.
  • Pin continuity: Check the published contact map before field signals are applied.
  • Channel proof: Inject or observe one analog channel and confirm the correct controller value.
  • Cross-channel check: Unexpected values on another channel indicate a connector, cable or terminal mapping error.
Description
Siemens 6ES7921-5CK20-0AA0 is the SIMATIC TOP connect front connector module for analog S7-1500 I/O. It converts the 40-pole module-side connection into one 50-pole IDC cable interface so analog channels can continue into the prefabricated wiring system.

Inside 6ES7921-5CK20-0AA0, each analog signal contact follows the fixed circuit map from the S7-1500 front connector to its assigned IDC conductor. This preserves channel order across the cable and prevents the connector module from performing any signal scaling or conversion.

Power for 6ES7921-5CK20-0AA0 enters through the separate infeed arrangement described for the connected analog module. The supply path and analog conductors share the connector body but retain their assigned terminals in the published circuit diagram.

A complete connection using 6ES7921-5CK20-0AA0 therefore depends on three matched parts: the supported S7-1500 analog module, this front connector module and the correct 50-pole TOP connect cable or terminal component. Their pin maps must be treated as one wiring chain.
Alternative Names
S7-1500 6ES7921-5CK20-0AA0 6ES7921 5CK20 0AA0 Siemens 6ES79215CK200AA0 6ES7 921-5CK20-0AA0 Analog TOP connect 6ES7921-5CK20-0AA0 6ES7921-5CK20-OAA0 Siemens TOP connect 6ES7921-5CK20-0AA0 6ES7 921 5CK20 0AA0
Technical notes
Match Siemens 6ES7921-5CK20-0AA0 to the documented analog S7-1500 module and verify every IDC conductor against the circuit diagram.
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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.
Which S7-1500 modules can use Siemens 6ES7921-5CK20-0AA0?
Use only the analog I/O modules listed for Siemens 6ES7921-5CK20-0AA0 in the TOP connect selection table.
Why does one analog channel appear on the wrong terminal with 6ES7921-5CK20-0AA0?
Compare the module, IDC cable and terminal-module pin maps for 6ES7921-5CK20-0AA0; a mismatched component can shift the channel assignment.
Does Siemens 6ES7921-5CK20-0AA0 convert voltage signals to current signals?
No. Siemens 6ES7921-5CK20-0AA0 only routes contacts; the S7-1500 analog module determines the signal type.
How long can the cable connected to 6ES7921-5CK20-0AA0 be?
The documented maximum connecting-cable length for 6ES7921-5CK20-0AA0 is 30 m, subject to the analog-module wiring limits.
What should be checked before energizing Siemens 6ES7921-5CK20-0AA0?
Verify the supported module, infeed polarity, keyed IDC orientation and published pin map for Siemens 6ES7921-5CK20-0AA0.
Why are there 50 IDC contacts on 6ES7921-5CK20-0AA0 for a 40-pole module connection?
The TOP connect circuit of 6ES7921-5CK20-0AA0 uses the larger IDC interface to carry the complete mapped signal and supply arrangement.