Siemens
Siemens SIMATIC S7-400 SM 421 Digital Input Module - 16 DI, 120/230V AC
Siemens S7-400 SM 421 digital input module, 16 DI, 120/230V AC.
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12-month warranty
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Same-day dispatch
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Veteran-owned
CAGE: 9NK75
16 Digital Inputs
120/230V AC Operation
Optical Isolation
Wide Voltage Range
S7-400 Compatibility
Product description
The Siemens SIMATIC S7-400 SM 421 module (6ES7421-1FH00-0AA0) offers 16 optically isolated digital inputs for 120/230V AC signals. This module is engineered for robust performance in environments with higher AC voltage requirements.
This module is suitable for applications where AC control signals in the 120V or 230V range need to be monitored. Industries such as power generation, building management, and heavy manufacturing often utilize such voltage levels for discrete control.
Stanlo Automation, a veteran-owned surplus parts distributor, stocks the Siemens 6ES7421-1FH00-0AA0. Partner with us for reliable surplus automation components and efficient service.
Technical specifications
| Inputs | 16 DI |
| Voltage | 120/230V AC |
| Isolation | Optical |
| Series | SIMATIC S7-400 SM 421 |
Common applications
Industrial Control Systems
HVAC Systems
Power Distribution
Building Automation
PLC Inputs
Compatible systems
SIMATIC S7-400 PLC Systems
Also known as
Siemens S7-400 16-Channel AC Input
SM 421 120/230V DI
6ES74211FH000AA0
Replaces / compatible with
This module serves as a replacement for Siemens S7-400 digital input modules requiring 120V or 230V AC signal monitoring. It integrates with the S7-400 PLC platform.
Technical note
Expert tip
For the 6ES7421-1FH00-0AA0, ensure that the AC input signal frequency is compatible with the module's specifications to avoid operational issues.What happens next?
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Frequently asked questions
What is the input voltage range for the Siemens 6ES7421-1FH00-0AA0 module?
The Siemens 6ES7421-1FH00-0AA0 SM 421 module accepts 16 digital inputs rated for 120V AC or 230V AC. Its optical isolation ensures safe signal transmission to the S7-400 controller.