Home > Products > SIEMENS > SIMATIC S7 Series
Exact configuration
Complete model 6ES7921-5AH20-0AA0, fully modular SIMATIC TOP connect front connector module.
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Connection format
Four 16-pole IDC interfaces for digital 32 I/O modules and a 40-pole front connector.
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Mechanical format
Maximum drawing envelope is 29.8 x 130.5 x 45.5 mm and the current data sheet lists 0.099 kg net weight.
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Potential supply
24 V DC rated supply through Push-In terminals with up to 1 A per plug-in contact.
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Complete model
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6ES7921-5AH20-0AA0
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Brand
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Siemens
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Product family
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SIMATIC TOP connect front connector modules
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Product type
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Fully modular front connector module
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Target system
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SIMATIC S7-1500
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Suitability
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Digital I/O modules
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Dimensions
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Maximum envelope 29.8 x 130.5 x 45.5 mm; body width 25.4 mm
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Weight
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0.099 kg net
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Supply voltage
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24 V DC rated; 60 V DC maximum
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Rated current
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1 A
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Current per plug-in contact
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1 A maximum
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Total current
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2 A maximum, horizontal mounting
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Front connector poles
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40
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Cable interfaces
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4 x 16-pole IDC connectors
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Maximum wire length
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30 m
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Supply connection
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Push-In terminal
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Terminals
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8; four L+ and four M
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Operating temperature
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0 to +60 deg C
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Storage temperature
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-40 to +70 deg C
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Mounting
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Direct mounting
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Certification
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cULus approval
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Front connector
The module uses a 40-pole front connector for the S7-1500 I/O module.
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Cable interfaces
Four 16-pole IDC connections are provided for connecting cables.
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Supply terminals
Eight Push-In terminals provide four L+ and four M connections.
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Cable length
Maximum specified distance between front connector and terminal module is 30 m.
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Rated voltage
Potential supply is rated 24 V DC.
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Maximum voltage
The official data sheet lists 60 V DC maximum.
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Contact current
Maximum continuous current is 1 A per plug-in contact.
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Total current
Maximum total current is 2 A for horizontal mounting.
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Conductor range
Flexible conductors with end processing are 0.25 to 1.5 mm2.
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Stranded range
Stranded and finely stranded conductors without end processing are 0.5 to 1.5 mm2.
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Strip length
Specified stripped length is 8 mm.
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Insulation diameter
Maximum wire-insulation outer diameter at the supply terminal is 3.1 mm.
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Target system
Designed for SIMATIC S7-1500 digital I/O modules.
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Connection system
Part of the fully modular SIMATIC TOP connect system cabling concept.
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Mounting
The front connector module is installed by direct mounting.
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Approval and climate
cULus approved, with operation from 0 to +60 deg C and storage from -40 to +70 deg C.
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1
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How can a buyer verify that the offered item is exactly 6ES7921-5AH20-0AA0?
Request dated photos of the article label, 40-pole front connector, four 16-pole IDC interfaces and Push-In supply terminals. The complete code must read 6ES7921-5AH20-0AA0.
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2
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How can New, Used, and Refurbished condition be distinguished for this connector module?
Inspect the IDC sockets, spring contacts, Push-In terminals, housing guides and label. Bent contacts, terminal marks, scratched guides, residue or replaced labels can indicate prior use or refurbishment.
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3
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How should a purchaser check whether the supplier is legitimate and reliable?
Verify the registered company identity, business address, bank beneficiary and traceable sales history. The quotation and invoice should list the complete 6ES7921-5AH20-0AA0 code.
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4
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Which specifications should an engineer confirm before purchase?
Confirm S7-1500 digital I/O compatibility, 40-pole front connection, four 16-pole IDC interfaces, 24 V DC Push-In supply, current limits, 30 m cable limit, 29.8 x 130.5 x 45.5 mm envelope and 0.099 kg weight.
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5
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What physical evidence should be requested before payment?
Request current photos or video of the complete label, all IDC sockets, Push-In terminals, front-connector contacts, housing and packaging, plus ruler views of the maximum mechanical envelope.
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6
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Can another TOP connect front connector replace 6ES7921-5AH20-0AA0?
Not automatically. Terminal type, IDC count, pole arrangement, current capacity and I/O-module compatibility may differ. Engineering approval is required after checking the full article number and wiring design.
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