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

View all PLC Accessories

Subtotal (1 unit)*

£509.04

(exc. VAT)

£610.85

(inc. VAT)

Add to Basket
Select or type quantity
Temporarily out of stock
  • Shipping from 27 October 2025
Need more? Click ‘Check delivery dates’ to find extra stock and lead times.
Units
Per unit
1 +£509.04

*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.:
226-3992
Mfr. Part No.:
6ES7421-1FH20-0AA0
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 120/230V input voltage and 80mA current.

Input current 80mA
Number of digital inputs 16
Type of input voltage AC/DC
Power loss 12 W
Isolation tested with 1500 V AC

Related links