SBC PCD2.M5 Series - Page 64

Hardware Manual for the PCD2.M5 Series│Document 26/856; Version EN 12│2014-07-24
Saia-Burgess Controls AG
Software watchdog
PCD2.M5_ Classic CPUs and expansion housings
3-51
3
As address 255 is in the normal I/O range, there are restrictions on the permissible
I/O modules in certain sockets:
CPU type Restrictions
PCD2.M5_ 1) Noanalogue,counterandmotioncontrolmodulesonthe
socketwithbaseaddress240(apartfromPCD3.W3x5and
PCD3.W6x5,whicharenotaffectedbythewatchdog)
2) output255cannotbeusedfordigitalI/Omodules
Watchdog-connectiondiagram
WD
WD
+24V
0V
WD
25
26
22
23
+ -
0
1 +
PCD2.M5_
Supply
Start
Bridging switch
for
CPU-Start
Process
Main switch
A-module
1)
Switching capacity of the watchdog contact: 1 A, 48 VAC/DC
The status of the watchdog relay can be read via I 8107
“1”=Watchdogrelayon.