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v10.0.1.x for R2026a
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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

PinIO421-1 (L*)IO421-2 (S*)IO421-3 (5*)IO421-4 (6*)IO421-5 (W*)
1Ch 01 A LoCh 01 S1 (sin-)Ch 01 A LoCh 01 S1 (sin-) 
21Ch 01 A HiCh 01 S3 (sin+)Ch 01 A HiCh 01 S3 (sin+) 
2Ch 01 B HiCh 01 S2 (cos+)Ch 01 B HiCh 01 S2 (cos+) 
22Ch 01 B LoCh 01 S4 (cos-)Ch 01 B LoCh 01 S4 (cos-) 
3Ch 01 RHCh 01 RHCh 01 RHCh 01 RHRHI-OUT
23Ch 01 RLCh 01 RLCh 01 RLCh 01 RLRLO-OUT
4Ch 02 A LoCh 02 S1Ch 02 A LoCh 02 S1 
24Ch 02 A HiCh 02 S3Ch 02 A HiCh 02 S3 
5Ch 02 B HiCh 02 S2Ch 02 B HiCh 02 S2 
25Ch 02 B LoCh 02 S4Ch 02 B LoCh 02 S4 
6Ch 02 RHCh 02 RHCh 02 RHCh 02 RH 
26Ch 02 RLCh 02 RLCh 02 RLCh 02 RL 
40Ch 03 A LoCh 03 S1   
60Ch 03 A HiCh 03 S3   
41Ch 03 B HiCh 03 S2   
61Ch 03 B LoCh 03 S4   
42Ch 03 RHCh 03 RH   
62Ch 03 RLCh 03 RL   
43Ch 04 A LoCh 04 S1Ch 03 A LoCh 03 S1 
63Ch 04 A HiCh 04 S3Ch 03 A HiCh 03 S3 
44Ch 04 B HiCh 04 S2Ch 03 B HiCh 03 S2 
64Ch 04 B LoCh 04 S4Ch 03 B LoCh 03 S4 
45Ch 04 RHCh 04 RHCh 03 RHCh 03 RH 
65Ch 04 RLCh 04 RLCh 03 RLCh 03 RL 
[Note]Note

S/D S4 connection for resolvers only (leave unconnected for synchro)

Slot 2

PinIO421-1 (L*)IO421-2 (S*)IO421-3 (5*)IO421-4 (6*)IO421-5 (W*)
27Ch 01 A LoCh 01 S1 (sin-)Ch 01 A LoCh 01 S1 (sin-) 
8Ch 01 A HiCh 01 S3 (sin+)Ch 01 A HiCh 01 S3 (sin+) 
28Ch 01 B HiCh 01 S2 (cos+)Ch 01 B HiCh 01 S2 (cos+) 
9Ch 01 B LoCh 01 S4 (cos-)Ch 01 B LoCh 01 S4 (cos-) 
29Ch 01 RHCh 01 RHCh 01 RHCh 01 RHRHI-OUT
10Ch 01 RLCh 01 RLCh 01 RLCh 01 RLRLO-OUT
30Ch 02 A LoCh 02 S1Ch 02 A LoCh 02 S1 
11Ch 02 A HiCh 02 S3Ch 02 A HiCh 02 S3 
31Ch 02 B HiCh 02 S2Ch 02 B HiCh 02 S2 
12Ch 02 B LoCh 02 S4Ch 02 B LoCh 02 S4 
32Ch 02 RHCh 02 RHCh 02 RHCh 02 RH 
13Ch 02 RLCh 02 RLCh 02 RLCh 02 RL 
66Ch 03 A LoCh 03 S1   
47Ch 03 A HiCh 03 S3   
67Ch 03 B HiCh 03 S2   
48Ch 03 B LoCh 03 S4   
68Ch 03 RHCh 03 RH   
49Ch 03 RLCh 03 RL   
69Ch 04 A LoCh 04 S1Ch 03 A LoCh 03 S1 
50Ch 04 A HiCh 04 S3Ch 03 A HiCh 03 S3 
70Ch 04 B HiCh 04 S2Ch 03 B HiCh 03 S2 
51Ch 04 B LoCh 04 S4Ch 03 B LoCh 03 S4 
71Ch 04 RHCh 04 RHCh 03 RHCh 03 RH 
52Ch 04 RLCh 04 RLCh 03 RLCh 03 RL 
[Note]Note

S/D S4 connection for resolvers only (leave unconnected for synchro)

Slot 3

PinIO421-1 (L*)IO421-2 (S*)IO421-3 (5*)IO421-4 (6*)IO421-5 (W*)
14Ch 01 A LoCh 01 S1 (sin-)Ch 01 A LoCh 01 S1 (sin-) 
34Ch 01 A HiCh 01 S3 (sin+)Ch 01 A HiCh 01 S3 (sin+) 
15Ch 01 B HiCh 01 S2 (cos+)Ch 01 B HiCh 01 S2 (cos+) 
35Ch 01 B LoCh 01 S4 (cos-)Ch 01 B LoCh 01 S4 (cos-) 
16Ch 01 RHCh 01 RHCh 01 RHCh 01 RHRHI-OUT
36Ch 01 RLCh 01 RLCh 01 RLCh 01 RLRLO-OUT
17Ch 02 A LoCh 02 S1Ch 02 A LoCh 02 S1 
37Ch 02 A HiCh 02 S3Ch 02 A HiCh 02 S3 
18Ch 02 B HiCh 02 S2Ch 02 B HiCh 02 S2 
38Ch 02 B LoCh 02 S4Ch 02 B LoCh 02 S4 
19Ch 02 RHCh 02 RHCh 02 RHCh 02 RH 
39Ch 02 RLCh 02 RLCh 02 RLCh 02 RL 
53Ch 03 A LoCh 03 S1   
73Ch 03 A HiCh 03 S3   
54Ch 03 B HiCh 03 S2   
74Ch 03 B LoCh 03 S4   
55Ch 03 RHCh 03 RH   
75Ch 03 RLCh 03 RL   
56Ch 04 A LoCh 04 S1Ch 03 A LoCh 03 S1 
76Ch 04 A HiCh 04 S3Ch 03 A HiCh 03 S3 
57Ch 04 B HiCh 04 S2Ch 03 B HiCh 03 S2 
77Ch 04 B LoCh 04 S4Ch 03 B LoCh 03 S4 
58Ch 04 RHCh 04 RHCh 03 RHCh 03 RH 
78Ch 04 RLCh 04 RLCh 03 RLCh 03 RL 
[Note]Note

S/D S4 connection for resolvers only (leave unconnected for synchro)