Programmable Logic Cfc - Siemens SIPROTEC 7SJ62 Instruction Manual

SIPROTEC 4 Devices
4.9

Programmable Logic CFC

CFC Designing
4-24
The CFC program in DIGSI
4 devices. For example, special interlocking conditions for controlled equipment can
be designed. Limit checks for measured values can be created, and corresponding
control can be designed.
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SIPROTEC 4 devices have some CFC functions set at the factory, according to the
version of the device.
User-defined CFC functions are done in graphical form. Generic logic modules (AND,
OR, NAND, etc.) and analog modules that are specially created for the requirements
of process control engineering (e.g., MAX, MIN, etc.) are available.
The CFC-modules are combined to form complete CFC-Logic Functions in order to
q
perform system-specific checks (interlocking),
q
generate messages if measured values approach a critical value, or
q
build group messages for transfer to higher-level control systems.
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Figure 4-19 DIGSI 4, CFC Basic Options, Example
Figure 4-20 shows the graphical nature of the CFC logic tool, and some of the com-
ponents that can be used to build the logic.
Note:
Online changes are protected in DIGSI
eter set).
Details about designing with the CFC program can be found in the instruction book,
order number E50417-H1176-C098.
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4 can be used to create additional logic in SIPROTEC
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4 by Password No. 7 (Password for param-
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7SJ62 Manual
C53000-G1140-C121-1