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- 6ES7921-5AK20-0AA0
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PRODUCT DESCRIPTION
Analog front connector for modular field wiring
Siemens identifies 6ES7921-5AK20-0AA0 as a front connector module for 40-pole S7-1500 analog I/O, with four 16-pole IDC cable connections. It belongs to the fully modular SIMATIC TOP connect range and receives potential through the I/O module's infeed element.
The front connector links compatible analog I/O to remote terminal modules through connecting cables. Sensors and actuators are wired at the terminal modules, while selection of the I/O assembly, terminal arrangement and shield connection follows the applicable Siemens documentation.
The front connector links compatible analog I/O to remote terminal modules through connecting cables. Sensors and actuators are wired at the terminal modules, while selection of the I/O assembly, terminal arrangement and shield connection follows the applicable Siemens documentation.
BEFORE YOU BUY
Confirm the complete installed configuration
ACTUAL APPLICATIONS
Where 6ES7921-5AK20-0AA0 Fits in Industrial Automation
Used in packaging, textiles and water treatment, with suitability determined by the installed analog I/O configuration.
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01 · PACKAGING
Packaging Machinery and Automated Product Handling Equipment
Packaging machinery and automated production equipment in manufacturing plants.Packaging equipment connecting analog field sensors and controlled actuators. -
02 · TEXTILE MANUFACTURING
Textile Production and Fabric Processing Plant Equipment
Textile production machinery requiring analog measurement of process conditions.Textile processing equipment connecting field sensors and controlled actuators. -
03 · WATER & WASTEWATER
Water Treatment Facilities and Wastewater Processing Plants
Water treatment equipment with analog process instrumentation and actuators.Wastewater treatment plants requiring distributed analog field signal connections.
Technical specifications for 6ES7921-5AK20-0AA0
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Product Model6ES7921-5AK20-0AA0
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Product ParametersAnalog Front Connector Module
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ManufacturerSiemens
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Supported automation platformSIMATIC S7-1500 / ET 200MP
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I/O module compatibility40-pole analog I/O modules
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Connection architectureSIMATIC TOP connect fully modular connection
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Cable interfaces4 x 16-pole IDC plug connections
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Nominal DC voltage24 V
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Potential supplyVia the I/O module infeed element
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Maximum connection length30 m between front connector module and terminal module
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Mounting methodDirect mounting in the I/O module
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Operating ambient temperature0 to 60 degrees C
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Storage temperature-40 to +70 degrees C
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Pollution degree2
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Overvoltage categoryII
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Analog terminal module capacityUp to four TPA terminal modules
View all additional
SYSTEM & REPLACEMENT CHECK
Information needed before ordering
Three direct checks to secure your system integration and minimize ordering risks.
Information
System integration
Replacement check
Manuals & support
ANALOG I/O CONNECTION
Match the analog module and field-wiring components
This front connector belongs to the fully modular TOP connect arrangement for compatible S7-1500 and ET 200MP analog I/O. It is a wiring accessory, not a signal-processing module, controller or independent fieldbus device.
Four 16-pole IDC connections route the analog module terminals through connecting cables to selected TPA terminal modules. The terminal modules provide the field connection points for sensors and actuators; the installed I/O module determines the measurement or output functions.
Confirm the complete I/O order number, cable selection and terminal assignment. Potential feed, shield termination and auxiliary terminals must follow the exact installation documentation. Do not transfer digital-connector wiring or current limits to the analog arrangement.
Features:
- Select compatible analog I/O and TPA terminal modules
- Check all four IDC cable paths and terminal assignments
- Verify potential supply and shield termination
The Siemens 6ES7921-5AK20-0AA0 front connector requires the installed analog I/O, terminal modules and wiring to be checked before system integration and commissioning.
INTERCHANGEABILITY
Verify the complete replacement identity before commissioning
Match the full connector order number to the removed assembly and the engineering bill of materials. Similar-looking TOP connect variants serve different I/O arrangements. Physical similarity alone is not evidence that a digital or 50-pole version is interchangeable.
Record cable orientation, terminal-module assignments, shield connections and the infeed arrangement before removal. Qualified personnel must isolate the affected circuits and follow the manufacturer safety and installation procedure. Preserve the original project wiring information.
After installation, check connector seating, strain relief, conductor assignment and the intended analog signals before returning the equipment to service. Match the electrical limits to the supplied hardware edition; the current catalog and historical manual must not be mixed.
Features:
- Match the complete analog-connector order number
- Preserve terminal mapping, shielding and cable orientation
- Verify connector seating and analog field signals
The Siemens 6ES7921-5AK20-0AA0 front connector requires replacement verification based on its exact order number, hardware edition, analog I/O and field-wiring arrangement.
DOCUMENTATION STATUS
Browse the Manuals, Datasheets, Official Documents, Links
Important Notice: Official documents are provided through manufacturer links. Accessories, manuals, cables, calibration data, software, certificates, and other items are not included with this equipment unless listed in the stock item description.Features:
- Exact-model catalog data and selected original wiring pages
- Installation reference includes original dimension and circuit drawings
- Accessories and supplied documentation follow the written quotation
Documentation for the Siemens 6ES7921-5AK20-0AA0 front connector includes current catalog facts and a historical wiring reference; match the applicable document edition to the delivered hardware and the approved installation design.
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Important notice
Manuals, software, firmware, cables, calibration data and accessories are included only when listed in the quotation. AMIKON is an independent supplier and is not affiliated with or authorised by the manufacturer.
This content has been produced using multiple sources. Takes no responsibility for the accuracy of this information. Always consult the original equipment manufacturer for the most up to date instructions and information.
BUYER INFORMATION
Commercial terms without hidden steps
Your written quote confirms the product identity, price, availability, lead time, warranty and shipping terms before payment.
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Shipping & delivery
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DispatchEligible stock: same / next day
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CarriersDHL, FedEx or UPS
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Ship fromXiamen, China
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Packed size13.3 x 5.0 x 3.4 cm (L x W x H)
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Shipping weightConfirm final packed weight
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Payment & customs
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PaymentBank transfer (T/T)
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CurrenciesUSD · EUR · GBP · RMB
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Credit cardsNot accepted
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HS reference8536690000
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OriginRomania
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Warranty & returns
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Warranty12 months from AMIKON
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InspectionLabel, condition and packing checks
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ReturnsPrior RMA authorisation required
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CompatibilityConfirm before order
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OEM warrantyDoes not apply
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Your written quote confirms the product identity, price, availability, lead time, warranty and shipping terms before payment.
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Part checked
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Dedicated account manager · 15+ years
FREQUENTLY ASKED QUESTIONS
Questions buyers ask about 6ES7921-5AK20-0AA0
Direct answers about identity, compatibility, stock, warranty, payment and shipping.
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What is 6ES7921-5AK20-0AA0 used for?
It connects compatible 40-pole S7-1500 analog I/O modules to SIMATIC TOP connect terminal modules through four 16-pole IDC cable connections. -
Is this an analog input or output module?
No. It is a front connector accessory. The connected I/O module determines signal processing, channel functions and supported sensor or actuator types. -
Which terminal modules are documented?
The Siemens selection guide pairs this connector with TPA analog terminal modules. Verify the complete I/O and terminal-module order numbers in the applicable selection table. -
How many analog terminal modules can be connected?
The documented analog arrangement supports up to four terminal modules, with two on each side of the I/O module. Follow the original terminal assignment. -
What is the maximum connection length?
The current Siemens technical data lists 30 m between the front connector and terminal module. Select the approved cable and check the requirements of the actual analog signal circuit. -
Where is the analog cable shield connected?
Siemens describes shield termination at the I/O module shield connection element or at the terminal module shield plate. Use the arrangement specified for the installation. -
Can a digital front connector be substituted?
Do not substitute a digital connector based on appearance. The analog connector has its own order number, terminal mapping and compatible terminal-module selection. -
Which electrical ratings should be checked before installation?
Use documentation matching the delivered hardware. The historical wiring manual and current catalog list different maximum electrical ratings; do not combine limits from different editions.
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