Hardware manual PCD7.LRxx-PG5 room controller │ Document 27-653; version ENG07 │ 2019-03-21
Saia-Burgess Controls AG
Watchdog (software)
Room controller/CPU
3-21
3
3.11 Watchdog (software)
A software watchdog (in which the processor monitors itself and the CPU is re-
-
tions.
The core of the software watchdog is the STL command SYSWR K 1000, which is
Function
instruction must then be output at least every 200 ms, otherwise the watchdog will
be triggered and the PCD restarted.
FUPLA FBox example:
FBox Selector -> System Information -> Software Watchdog
Instruction in STL code:
Label Com-
mand
Operand Comment
SYSWR K 1000 ; Software watchdog instruction
R/K x ; Parameters as per the following table
; K = constant or R = register
; followed by a space.
; x = 0 The software watchdog is
; disabled.
; x = 1 The software watchdog is
; enabled. If the instruction
; is not repeated within 200 ms,
; a cold start is
; initiated.
; x = 2 The software watchdog is
; enabled. If the instruction
; is not repeated within 200 ms,
; XOB 0 is called up, then
; a cold start is
; initiated.
“XOB 0” call-ups are entered in the PCD history as follows:
if XOB 0 was triggered by the software watchdog
if XOB 0 was triggered by a supply failure
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