Siemens SIMATIC TI500 Especificaciones Pagina 244

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Troubleshooting
9-24
SIMATIC 545/555/575 System Manual
9.10 PROFIBUS-DP Communications Watchdog Timer
Most slaves have a communications watchdog timer that may be activated
or deactivated by the user during initial configuration. The communications
watchdog timer is distinct from a hardware watchdog timer. The
communications watchdog timer monitors time between communications
from the PROFIBUS-DP annex card. If the communications watchdog timer
is activated and communication between the PROFIBUS-DP annex card
and the slave is broken, the communications watchdog timer on the slave
will expire and set the output points to a safe state. The safe state may vary
depending on the slaves design, but most slaves zero the output points.
Refer to your slave manual(s) for more information about slave watchdog
timer reaction.
The PROFIBUS-DP annex card restarts communications to the slaves in
the following events:
If an error has been detected by the CPU, when the error is cleared by
the CPU.
When communication between the PROFIBUS-DP annex card and the
CPU is restored.
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