ABB Relion 670 Series RES670, Technical Manual

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16.9 Limit counter L4UFCNT
16.9.1 Identification
16.9.1.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Limit counter L4UFCNT -
16.9.2 Functionality
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
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
Figure 219 illustrates the general logic diagram of the function.
1MRK 511 365-UUS A
Section 16
Monitoring
Phasor measurement unit RES670 2.1 ANSI 575
Technical manual