Hardware Manual for the PCD3 Series│Document 26/789; Version E 5│31.01.2005
Saia-Burgess
Controls Ltd.
Hardware watchdog
PCD3.Mxxx0 Classic CPUs and expansion housings
3-28
3
Watchdog - connection diagram
WD
1)
Supply
WD
Start
Bridging switch
for
CPU-Start
Process
Main switch
+24V
0V
WD
5 6
7
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1)
Switching capacity of the watchdog contact: 1A, 48V AC/DC
The status of the watchdog relay can be read via I 8107.
“1” = Watchdog relay on.
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