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SIEMENS 6ES7421-7BH01-0AB0 SIMATIC Digital Input Module

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SIEMENS · SIMATIC S7-400

6ES7421-7BH01-0AB0

SM 421 Digital Input Module

Digital input module for reliable status acquisition in modular S7-400 control stations.

MODULESM 421

SIGNALSDigital input

PLATFORMS7-400

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Product Details

SYSTEM PROFILE

6ES7421-7BH01-0AB0

SIMATIC S7-400 SM421 digital input module for reliable acquisition of 24 V DC field signals in modular automation systems.

DEPLOYMENT CONTEXT

plant control, process automation and large machine systems

Use the complete article number and installed engineering configuration for replacement decisions.

FUNCTION MATRIX

Three points to verify

A clean replacement starts with identity, interface and installation checks.

Digital input

System compatibility

24 V DC

Functional requirement

S7-400

Article-number match

PRACTICAL PLANNING

Confirm before removal

Preserve the information needed for an accurate replacement.

Installed position

Record rack, slot and mounting orientation.

Wiring & settings

Label cables and retain communication settings.

Nameplate data

Capture the full article number and revision.

FIELD QUESTIONS

FAQ

01　What is 6ES7421-7BH01-0AB0?

SIMATIC S7-400 SM421 digital input module for reliable acquisition of 24 V DC field signals in modular automation systems.

02　Which platform uses it?

It is part of the SIMATIC S7-400 platform.

03　What should be checked before installation?

Check ratings, wiring, mechanics and engineering parameters.

04　Can a close article number be used?

Only after complete functional and hardware compatibility is confirmed.

05　What helps with a quotation request?

Provide model, quantity, destination and clear label photos.

Cross-brand inventory

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HIMA

10 MODELS

01HIMA F3 DIO 8/8 01 Remote I/O Module↗02HIMA F3226 Digital Input Module↗03HIMA F60GEH01 HIMATRIX Safety-Related Controller↗04HIMA BV7032-0.5 Data cable of the I/O bus↗05HIMA 52100 Logic function module↗06HIMA 42300 Logic function module↗07HIMA F6251 safety-related limit monitor↗08HIMA F3113A Output amplifier module↗09HIMA F1101 New value/first value annunciator module↗10HIMA F4204 Safety-Related Logic Module↗

Others

10 MODELS

016FX8002-5CN01-1AG0↗02MS1001L 1.85↗03E1020↗0400449909↗05P-5288A↗06SEA4D-01↗07M112FM08↗08953560↗09RP6000 RP6150A↗10AFB24↗

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