The Siemens 6ES5420-4UA14 is a compact SIMATIC S5 Digital Input 420 module with thirty-two non-isolated 24 V DC inputs. It collects discrete field states for the legacy S5 controller through the configured rack and process wiring.
- SIMATIC S5
- Digital Input 420
- 32
- 24 V DC
The module is used for dense sensor, contact, and status acquisition where the original S5 design relies on common-referenced non-isolated inputs.
Important Notice: Use the complete 6ES5420-4UA14 code and verify the physical nameplate and current Siemens documentation before installation or replacement.
Apter Power 6ES5420-4UA14 Manuals and Guides
Important Notice: These are two separate Apter Power documents prepared from the manufacturer-published Siemens information named in each document. Confirm the physical nameplate, current Siemens documents, and host-system requirements before installation or replacement.
Legacy machine inputs
Acquire dense switch and sensor states.
Process status collection
Read non-isolated 24 V DC contacts.
S5 spare strategy
Maintain the exact module while preparing migration.
Read and follow the exact Siemens documentation and host-equipment instructions before use. Verify 6ES5420-4UA14 from the physical nameplate.
1
Recognize that the inputs are non-isolated
2
Verify shared reference potential and grounding
3
Label the 32-channel connector before removal
4
Back up the STEP 5 program and address assignment
5
Do not substitute another 420 suffix without pinout review