Response In The Event Of Disturbed Communication To The Profibus-Dp Master; Communication Interruption - Siemens SIPROTEC 7SA522 Manual

Parameters and properties
2.3 Response in the event of disturbed communication to the
PROFIBUS-DP master
2.3.1

Communication interruption

After detecting
the interrupted
connection to
the PROFIBUS-DP
master
After reestablishing
the communication
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Attention!
The reaction to communication interruption described in this chapter is only possible
in the SIPROTEC device, if the response monitoring of the PROFIBUS-DP slaves is
activated in the PROFIBUS-DP master.
The following response is defined for the SIPROTEC devices:
1. The tagging "SysIntErr" (Error System interface) in the SIPROTEC device is
set to ON (registration in the operations event log, processing in CFC is possible).
2. The status of the outputs and switching devices remains the same as they were
before the interruption of the communication.
1. The tagging "SysIntErr" (Error System interface) in the SIPROTEC device is
set to OFF (registration in the operations event log, processing in CFC is possible).
2. The data from the messages which are now again received by the PROFIBUS-DP
master are registered (if this is possible according to the control authority status).
If the switching device status of the SIPROTEC devices shall not be changed after
reestablishing the communication between PROFIBUS-DP master and slave then
"Quiescent status" (value "00") has to be transmitted in the output message's corre-
sponding bit positions or the control authority has to be set to LOCAL.
Note:
The following conditions set the tagging "SysIntErr" (Error System interface) to
ON:
1. The PROFIBUS-DP slave of the SIPROTEC device is not parameterized and con-
figured by the PROFIBUS-DP master (no bus connection between master and
slave, wrong PROFIBUS address, wrong PNO ident number, faulty configuration
of the slave in the PROFIBUS-DP master or the like).
2. The Response Monitoring time (Watchdog time) in the PROFIBUS-DP slave is
expired (the PROFIBUS-DP slave is not more addressed by the PROFIBUS-DP
master because of a break in the data traffic on the bus, e.g. a line-break).
3. Reception of the "Clear Data" Global Control message from the PROFIBUS-DP
master (e.g. if the PLC is switched to STOP mode).
The tagging "SysIntErr" is only set if in the output message to the SIPROTEC
device at least one bit was set before reception of "Clear Data".
SIPROTEC PROFIBUS-DP - Communication profile
C53000-L1840-B001-03