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PRODUCT DETAILSSIEMENS

ARTICLE NUMBER

6ES7421-1FH20-0AA0

SIMATIC S7-400 Digital Input Module

Isolated sixteen-channel universal-voltage input module for acquiring high-voltage field and auxiliary-contact signals in S7-400 systems.

WARRANTYOne year

AVAILABILITYIn stock

TEL+86 17359287459

EMAILsales9@apterpower.com

DIAGNOSTICS, PROTECTION & INSTALLATION

Digital inputs16 DI	Input voltage120 / 230 V UC	Input profileIEC Type 2	Frequency range47 to 63 Hz
Input delay20 / 30 ms	Isolation groups4	Backplane current80 mA	Power loss12 W

DIAGNOSTICS & PROTECTION

Channel status LEDs support local verification of field-signal states.
Four isolated groups provide structured separation of input circuits.
Observe the documented AC and DC signal thresholds during testing.
De-energize high-voltage field wiring before installation or service.

INSTALLATION & UPGRADES

Match the original S7-400 slot and process-image address assignment.
Use shielded cable up to 1000 m or unshielded cable up to 600 m.
Verify conductor insulation and protective measures for 120/230 V circuits.
Test all 16 inputs under controlled conditions before returning to service.

BRAND CHARACTERISTICS & APPLICATION FIELDS

BRAND CHARACTERISTICS	APPLICATION FIELDS
◆ Siemens S7-400 architecture supports modular high-availability control systems.	◆ High-voltage auxiliary contacts and plant-status acquisition.
◆ Universal-voltage inputs accommodate both AC and DC field signals.	◆ Process utilities, substations and infrastructure control cabinets.
◆ Electrical isolation and defined input groups support cabinet organization.	◆ Installed S7-400 system expansion and replacement.
◆ Official technical limits simplify retrofit and lifecycle verification.	◆ Maintenance work where existing 120/230 V wiring must be retained.

RECOMMENDED MODELS · SIEMENS

6ES7321-1BL00-0AA0	6ES7322-1BH01-0AA0	6ES7132-6BF00-0CA0	6ES7122-1BB10-0AA0
6ES7288-2DR16-0AA0	6ES7222-1HF22-0XA8	6ES7131-6BH00-0BA0	6ES7422-1HH00-0AA0
6ES7231-7PB22-0XA8	6ES7221-1BH22-0XA0	6ES7142-4BF00-0AA0	6ES7132-6BD20-0BA0
6ES7132-4BD32-0AA0	6ES7952-0KH00-0AA0	6ES7421-1FH20-0AA0	6ES7953-8LF00-0AA0
6ES7131-4BF00-0AA0	6ES7972-0BA60-0XA0	6ES7193-4CB20-0AA0	6ES7400-2JA10-0AA0

RECOMMENDED MODELS · WEIDMÜLLER

UR20-FBC-PN-IRT-V2	UR20-16DI-P	UR20-16DO-P	UR20-4AI-UI-16
UR20-4AO-UI-16	UR20-8DI-P-3W	UR20-8DO-P	UR20-4AI-RTD-DIAG
UR20-2AI-SG-24-DIAG	UR20-PF-I	UR20-PF-O	UR20-PF-O-2DI-DELAY
UR20-1COM-232-485-422	UR20-1CNT-100	UR20-2FCNT-100	UR20-4RO-CO-255
UR20-8DI-P-2W-HD	UR20-16DO-P-PLC-INT	UR20-4AI-UI-DIAG	UR20-2AO-UI-16

QUOTE & SERVICE

01 IDENTIFYConfirm the complete article number.

02 VERIFYCheck revision and condition.

03 QUOTERequest price and availability.

04 DISPATCHPack and arrange shipment.

Tel: +86 17359287459 Email: sales9@apterpower.com

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Siemens S7-400 Datasheet Module

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