16.9 Limit counter L4UFCNT
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16.9.1 Identification
16.9.1.1 Identification
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Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Limit counter L4UFCNT -
16.9.2 Functionality
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The 12 Up limit counter L4UFCNT provides a settable counter with four independent limits where
the number of positive and/or negative sides on the input signal are counted against the setting
values for limits. The output for each limit is activated when the counted value reaches that limit.
Overflow indication is included for each up-counter.
16.9.3 Operation principle
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Limit counter (L4UFCNT) counts the number of positive and/or negative sides on the binary input
signal depending on the function settings. L4UFCNT also checks if the accumulated value is equal
or greater than any of its four settable limits. The four limit outputs will be activated relatively on
reach of each limit and remain activated until the reset of the function. Moreover, the content of
L4UFCNT is stored in flash memory and will not be lost at an auxiliary power interruption.
16.9.3.1 Design
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Figure
568 illustrates the general logic diagram of the function.
1MRK 502 066-UUS B Section 16
Monitoring
1093
Technical manual
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