
- 126 intended to be used for the "soft" addressing of Slave
devices;
- 127 intended to be used for broadcast messages to all the
Slaves.
Topology
In a communication network, the pattern of interconnection
between network nodes; e.g. bus, ring, star configuration.
Transmission Rate (Baud
rate)
The signalling rate of a digital communication line. It is the
switching speed, or number of transitions (voltage or
frequency changes) that are made per second. Within
PROFIBUS DP the possible transmission rates depend on the
MAU (Medium Attachment Unit) in use.
Watchdog Control
IEC 61158-6: This timer is part of the DP layer within a Slave.
It is restarted by received requests from the bus Master and
will set the outputs of a Slave to a fail-safe state after the
expiration of the timer.
Watchdog Time (Twd)
IEC 61158-5: The watchdog timer is part of the DP layer
within a Slave. The watchdog time is set by parametrization at
run-up and consists of a watchdog time base (1 or 10 ms) and
2 factors. A selection can be made during configuration via
the GSD file of a Slave. This is a Slave parameter. See
"Watchdog control".
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