A.4.6 Pre-Defined Cfc Charts - Siemens SIPROTEC 7SA522 Manual

A.4.6 Pre-defined CFC Charts
Device and System
Logic
Figure A-23 Allocation of input and output with blocks of priority class System Logic
Interlocking
7SA522 Manual
C53000-G1176-C155-3
Some CFC charts are already supplied with the SIPROTEC
the variant the following charts may be implemented:
Some of the event-controlled logical allocations are created with blocks of the slow
logic (PLC1_BEARB = slow PLC processing). This way, the binary input "Data Stop"
is modified from a single point indication (SP) into an internal single point indication
(IntSP) by means of a negator block.
With the double point indication "EarthSwit." = CLOSE an indication saying
"fdrEARTHED" ON, and with "EarthSwit." = OPEN or F the indication "fdrEARTHED"
OFF is generated.
From the output indication "definite TRIP" the internal indication "Brk OPENED"is gen-
erated. As indication "definite TRIP" only queued for 500ms, also indication "Device
Brk OPENED" is reset after this time period.
With blocks of level Interlocking (SFS_BEARB = interlocking), standard interlocking
for three switchgears (circuit breaker, disconnector and earth switch) is pre-defined.
Due to the large functional scope of the logic you will find this level on two worksheets.
The circuit breaker can be only be opened, if
• the circuit breaker is set to OPEN or CLOSE and
• the disconnector is set to OPEN or CLOSE and
• the earth switch is set to OPEN or CLOSE and
• the disconnector and the earth switch are not set to CLOSE at the same time and
A.4 Default Settings
®
device. Depending on
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