Additional Information About Watchdog Time - Pepperl+Fuchs HD2-GTR-4PA Manual

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O W E R
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Note
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5.2.2

Additional Information about Watchdog time

PROFIBUS devices can activate a mechanism that monitors each time
interval in the cyclic data exchange process (also referred to as user
data exchange) to ensure that the PROFIBUS master is still active. The
time is measured in the PROFIBUS slave.
Watchdog reprogramming during cyclic communication!
•
DPV1 slaves leave cyclic communication because the DPV1 standard
does not permit any Watchdog change during operation.
Warning
The BIS of the DP/PA Gateway performs diagnostics in the DTM and cy-
clically to determine whether the Watchdog time (TWD) is sufficient.
Note
If the response monitor is active and the time (T
polling process has expired, the device stops the cyclic data exchange,
reverts to its original status (Wait_prm) and secures the status of the
outputs.
The time value T
are transmitted from the PROFIBUS master to the PROFIBUS slave in
the parameter telegram at start-up (transmitted during the cyclic data
exchange). The time T
device-specific, not in the GSD). Lesser values are limited by the cycle
times.
The time T
dog setting in the DP/PA gateway is transparent. On some configuration
tools, the response monitor is preset once for the PROFIBUS master.
Subject to reasonable modifications due to technical advances.
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H S
U B E G M E N T
and the signal for activating the response monitor
WD
is generally defined specific to the user (not
WD
is usually entered via the configuration tool. The watch-
WD
C
O U P L E R
PROFIBUS Commissioning
) since the last cyclic
WD
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