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Diagnostics and repair
TTL/Relay Flow Chart
Start
Have
power supply
levels been
checked?
Yes
Are
signals at
I/O TB numbers
(see Table #1)
correct?
Yes
External wiring or
field device
problem
End
118
No
Refer to power
supply flow chart
No
Check I/O signal
cable and CPU
Table #1 – I/O Board
Relays
TB#
1
1
2
2
3
3
4
4
TTL
TB#
(O.C.)
1
3
3
4
4
4
5
4
6
4
Figure 59: PRO PAC TTL/Relay flow chart
W-4510 Weigh Scale Technical Reference Manual
No
Replace I/O
board
COM
-1
N/A
N/A
N/A
Non-isolated
4-11
4-6
5-6
7-9
8-9
N.C.
N.O.
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Isolated
4-5
N/A
N/A
N/A
N/A
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