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Redundant PROFIBUS DP interface
Maximum value of
Start-up time
1.3.2
Module status indications
1.3.2.1
Error system interface
20
GlobalSection.DP_Red_TsprimMax
During the redundancy start-up until the initial PRIMARY/BACKUP decision by the
PROFIBUS DP master, both modules have alternating the state S_PRIMARY and
S_WAITING (ref. to chap. 1.6.1).
A state change between the modules is carried out after the time Tsprimary.
Tsprimary starts at 2 s and will be increased by 2 s after each state change until the
configured maximum value TsprimMax.
TsprimMax is entered in 100 ms steps.
If a value is entered which is not divisible by 2 seconds then TsprimMax is rounded up
or down to the next 2 second value by the module firmware. All values less than 2 sec-
onds (including 0) are treated as 2 seconds.
The default value is 20 which corresponds to 2 seconds.
Because this is equal to the Tsprimary start value, all 2 seconds a state change
between S_PRIMARY and S_BACKUP is executed with the TsprimMax default value.
If PROFIBUS DP is selected as system interface then the tagging "SysIntErr" (Error
System interface) is available in the device parameter set to signal a communication
error to the PROFIBUS DP master.
The reaction of the SIPROTEC device to a communication interruption using the tag-
ging "SysIntErr" is described in the manual "SIPROTEC Communication module,
PROFIBUS DP - Communication profile", chap. "Communication interruption".
A redundant PROFIBUS DP slave differs from this behavior by the fact that only a
communication error of both modules leads to set the tagging "SysIntErr":
Module D
Communication OK
Module D
Communication error
Table 1-3
Tagging "SysIntErr"
Note:
If the Toggle bit mechanism is activated (Toggle bits, ref. to chap. 1.4.1.4) then a com-
munication error also will be signaled (despite correct PROFIBUS DP data exchange):
• as long as the Toggle bit mechanism was not started by the master device,
• when the Toggle bit timer expires.
Module B
Communication OK
"SysIntErr" = OFF
OK
"SysIntErr" = OFF
OK
SIPROTEC PROFIBUS DP - Bus mapping 6MD662/3/4
Module B
Communication error
"SysIntErr" = OFF
OK
"SysIntErr" = ON
Error
C53000-L1840-B011-03
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