IO421 Pin Mapping
IO421 Pin Mapping —
Reference information about
the I/O module connector
Description
All modules share a unique port (78-pin D-Sub) and the pins associated to the
module change with the slot location.
An 80-pin terminal board is provided with the IO421. Pin 79 and 80 are not
connected.
Signal descriptions, and operational information are described in the following
sections.
The location of each module installed in your IO421, is mentioned in a
separate custom document.
Slot 1
![[Note]](images/note.png) | Note |
|---|
S/D S4 connection for resolvers only (leave unconnected for synchro) |
Slot 2
![[Note]](images/note.png) | Note |
|---|
S/D S4 connection for resolvers only (leave unconnected for synchro) |
Slot 3
![[Note]](images/note.png) | Note |
|---|
S/D S4 connection for resolvers only (leave unconnected for synchro) |