Siemens SIMATIC S7-400 Series Series Digital I/O Module for Use with SIMATIC S7-400

View all PLC Accessories

Subtotal (1 unit)*

£560.55

(exc. VAT)

£672.66

(inc. VAT)

Add to Basket
Select or type quantity
Temporarily out of stock
  • Shipping from 17 November 2025
Need more? Click ‘Check delivery dates’ to find extra stock and lead times.
Units
Per unit
1 +£560.55

*price indicative

Shop Siemens SIRIUS
Discover our Siemens SIRIUS products. Command, Control, Monitor and start your motors the Hybrid way.
Find out more
RS Stock No.:
226-3995
Mfr. Part No.:
6ES7421-7DH00-0AB0
Brand:
Siemens
Find similar products by selecting one or more attributes.
Select all

Brand

Siemens

Accessory Type

Digital I/O Module

Range

S7-400

Series

SIMATIC S7-400 Series

For Use With

SIMATIC S7-400

COO (Country of Origin):
DE
The Siemens SIMATIC S7-400 series digital input SM 421 has 16 digital input. It has 24 to 60V input voltage and 150mA current.

Input current 150mA
Number of digital inputs 16
Type of input voltage AC/DC
Isolation tested with 1500 V AC

Related links