Annunciations To The Profibus-Dp Master - Siemens SIPROTEC 7SA522 Manual

2.4

Annunciations to the PROFIBUS-DP master

Protection pickup
Protection TRIP
SIPROTEC PROFIBUS-DP - Communication profile
C53000-L1840-B001-03
Note:
When analysing the annunciations of the SIPROTEC device in the PROFIBUS-DP
master, it should be noted that due to the cycle period of the PROFIBUS-DP system
or due to the cyclic processing time of a PLC, temporary changes of an annunciation's
value (ON and OFF within one cycle) may eventually not be recognized.
This applies in the first place for protection annunciations.
Protection annunciations which indicate the status "Protection pickup" are
active only for the period of time of the protection pickup.
The parameter Minimum Duration of TRIP Command (parameter address = 210)
allows setting of the minimum duration of the TRIP command.
This time setting applies to all protection functions which may cause a TRIP signal.
After a protection TRIP, the corresponding protection annunciations transmit the value
ON for the programmed minimum time duration.
Parameters and properties
37