PROFIBUS data transfer
6.9 Cyclic data traffic
3WL/3VL circuit breakers with communication capability - PROFIBUS
142 System Manual, 03/2011, A5E01051353-02
The output data of the class 1 master is identical in all three basic types. The control bytes in
the direction of the switch are always 2 bytes in length. The switch can be switched on and
off, trips acknowledged, and memory contents reset via these control bytes.
For all controllers, it is sufficient to set the relevant bits for 0.5 to 5 seconds because setting
of the outputs is edge-triggered. Following this, these control bits must be reset to avoid
subsequently triggering any undesired actions.
The table below contains a description of the control bytes for the SENTRON circuit breaker:
Table 6- 7 Control bytes for SENTRON circuit breakers
Byte Bit Value SENTRON WL SENTRON VL
COM15 COM20
0..3 Switching the circuit breaker
0 Not defined (no action)
1 Switch off (opening of the main contacts)
2 Switch on (closing of the main contacts)
0 / 1
3 Not defined (no action)
2 A currently active tripping operation is acknowledged and reset
3 Not used
4 Setting of the free user output Not used
5 Not used
6 Not used
n
7 Not used
0 Not used
1 Not used
2 Delete tripping and event log
3 Reset all minimum/maximum value memories (on WL, except temperature)
4 Reset minimum/maximum value buffers for
temperatures
Not available
5 Not used
6 Reset all maintenance information and counters which can be reset
n + 1
7 Bit for synchronizing the system time to the current half hour
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