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Siemens 6ES7421-7DH00-0AB0 SIMATIC S7-400 SM 421 Digital Input Module

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Siemens 6ES7421-7DH00-0AB0 SIMATIC S7-400 SM 421 Digital Input Module

Brand Name : Siemens

Model Number : 6ES7421-7DH00-0AB0

Certification : CE

Place of Origin : China

MOQ : 1

Payment Terms : T/T

Delivery Time : 2-3 days

Product Name : PLC Industrial Control

Part Number : 6ES7421-7DH00-0AB0

Shipment : DHL

Condition : New

Lead Time : 2-3 days

WQR12038HBL : 1 year

Keywords : 6ES7421-7DH00-0AB0

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Sinamics 6ES7421-7DH00-0AB0 Overview
The 6ES7421-7DH00-0AB0 is an optically isolated digital input module (SM 421) for the SIMATIC S7-400 controller platform. It provides 16 individually isolated digital input channels supporting a wide voltage range of 24–60 V UC (AC/DC), making it suitable for connecting standard switches and two‑wire proximity sensors (BEROs). Featuring configurable input delay, diagnostic interrupts, and alarm functions, this module ensures reliable signal acquisition in harsh industrial environments. It integrates seamlessly into S7-400 systems for factory automation, process control, and machinery monitoring applications.








Figure 1 shows the front panel of 6ES7421-7DH00-0AB0.

Siemens 6ES7421-7DH00-0AB0 SIMATIC S7-400 SM 421 Digital Input Module












Siemens 6ES7421-7DH00-0AB0 SIMATIC S7-400 SM 421 Digital Input Module














Quick Specs.

Table 1 shows the Quick Specs

Item Value
Type Digital Input Module, SM 421
Inputs 16 DI, individually isolated
Voltage 24–60 V UC (AC/DC)
Delay 0.5–20 ms
For SIMATIC S7-400








Detailed Specification
Parameter Detail
Order Number 6ES7421-7DH00-0AB0
Product Line SIMATIC S7-400
Input Type 16 x digital input, opto-isolated
Nominal Input Voltage 24 V to 60 V UC (AC/DC)
Input Current (ON) 4 mA typical
Input Delay 0.5 ms to 20 ms (adjustable)
Diagnostics Diagnostic interrupt, alarm function
Connection Screw/spring terminals
Dimensions W×D×H = 25 mm × 210 mm × 290 mm
Weight approx. 0.6 kg
Standards RoHS compliant



Siemens 6ES7421-7DH00-0AB0 SIMATIC S7-400 SM 421 Digital Input Module
Siemens 6ES7421-7DH00-0AB0 SIMATIC S7-400 SM 421 Digital Input Module

Product Tags:

Siemens S7-400 digital input module

      

SM 421 PLC control module

      

SIMATIC S7-400 industrial input module

      
China Siemens 6ES7421-7DH00-0AB0 SIMATIC S7-400 SM 421 Digital Input Module factory

Siemens 6ES7421-7DH00-0AB0 SIMATIC S7-400 SM 421 Digital Input Module Images

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