B 5233-1/-2 / H51q-HS/HRS (0605)
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4.5.6 Shutdown ways in the H51q-HS system
In safety-related systems an independent 2nd safety shutdown is necessary. This is done by
the watchdog signal. At fault on the CPU or the I/O connection the watchdog shuts down all
safety-related outputs.
Figure 6: Shutdown ways in the H51q-HS system
I/O bus
I/O bus
I/O bus
I/O bus I/O bus
T =
Safety related output module
B
S =
Shut via operating system
X = Lo
ic si
nal
down
IO-CON = Coupling module
WD = Watchdog
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