TROUBLESHOOTING
MODULE PIN CONNECTIONS
5 - 2
WBPEEUI240752A0
®
digital input module and the control module. Verify the bus
connection on the MMU back plane.
NOTE: If FC 84 specification S3 is set to 0, the control module will
trip when the DSI module fails. Changing specification S3 to a 1 will
allow the control module to continue to operate when a digital input
module fails.
If you determine the digital input module is faulty, replace it
with a new one. Refer to the
in Section 7 for procedures to replace a DSI module.
MODULE PIN CONNECTIONS
The digital input module has three connection points for exter-
nal signals and power (P1, P2 and P3). Tables
show the pin connections.
Table 5-1. P1 Power
Pin Connections
Pin (P1)
Connection
1
+5 VDC
2
+5 VDC
3
NC
4
NC
5
COMMON
6
COMMON
7
NC
8
NC
9
NC
10
NC
11
NC
12
NC
NC = Not connected
Table 5-2. P2 Expander
Bus Connections
Pin (P2)
Signal
1
Data 1
2
Data 0
3
Data 3
4
Data 2
5
Data 5
6
Data 4
7
Data 7
8
Data 6
