Description
DO 440 — Digital Output Module
Siemens · DO 440 · 6ES5440-8MA21
Description
The DO 440 (6ES5440-8MA21) is a non-floating digital output module for the SIMATIC S5-90U/95U/100U, ET 100U, and ET 200U systems, providing 4 digital outputs at 24V DC with 2A per channel, suitable for driving contactors, valves, and similar loads.
Key specifications
Parameter | Value |
Function | Digital output module for S5-90U/95U/100U, ET100U, ET200U |
Channels | 4 digital outputs |
Output rating | 24 V DC, 2 A per channel |
Isolation | Non-floating (common ground) |
Reference
Field | Value |
Manufacturer (OEM) | Siemens |
Model | DO 440 |
Part number | 6ES5440-8MA21 |
Category | Digital I/O |
System family | SIMATIC S5-90U/95U/100U |
Stores quantity | 8 |
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 automatyka24.pl and jc-electronics.com datasheets confirming DO 440 = 4x24VDC/2A non-floating output module.
Source: Spare Parts List for Sales V7 (Bohemia Market / BM Global stores inventory). Filed in the AI HW Knowledge Base.