Description
DI 421 — Digital Input Module
Siemens · DI 421 · 6ES5421-8MA12
Description
The DI 421 (6ES5421-8MA12) is a non-floating (potential-bound) digital input module for the SIMATIC S5-90U/95U/100U, ET 100U, and ET 200U systems, providing 8 digital inputs at 24V DC.
Key specifications
Parameter | Value |
Function | Digital input module for S5-90U/95U/100U, ET100U, ET200U |
Channels | 8 digital inputs |
Input voltage | 24 V DC |
Isolation | Non-floating (potential-bound) |
Weight | ~190 g |
Reference
Field | Value |
Manufacturer (OEM) | Siemens |
Model | DI 421 |
Part number | 6ES5421-8MA12 |
Category | Digital I/O |
System family | SIMATIC S5-90U/95U/100U |
Stores quantity | 5 |
Data confidence | high |
Manuals filed (007 - Manuals)
- Manual STEP5 S5-100U English.PDF — S5-100U system manual (English) covering CPU/IO/memory for the 100U programmable controller
Notes
Verified via euautomation.com datasheet, adegis.com, sps-service.eu, and icdcspares.com listings confirming DI 421 = 8x24VDC non-floating input module.
Source: Spare Parts List for Sales V7 (Bohemia Market / BM Global stores inventory). Filed in the AI HW Knowledge Base.