Application - ABB RELION 620 Series Technical Manual

Section 3
Basic functions
3.17.15.4
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Figure 103: Functional module diagram
Up-down counter
Each rising edge of the UP_CNT input increments the counter value CNT_VAL by one
and each rising edge of the DOWN_CNT input decrements the CNT_VAL by one. If
there is a rising edge at both the inputs UP_CNT and DOWN_CNT, the counter value
CNT_VAL is unchanged. The CNT_VAL is available in the monitored data view.
The counter value CNT_VAL is stored in a nonvolatile memory. The range of the
counter is 0...+2147483647. The count of CNT_VAL saturates at the final value of
2147483647, that is, no further increment is possible.
The value of the setting Counter load value is loaded into counter value CNT_VAL
either when the LOAD input is set to "True" or when the Load Counter is set to "Load"
in the LHMI. Until the LOAD input is "True", it prevents all further counting.
The function also provides status outputs UPCNT_STS and DNCNT_STS. The
UPCNT_STS is set to "True" when the CNT_VAL is greater than or equal to the setting
Counter load value. DNCNT_STS is set to "True" when the CNT_VAL is zero.
The RESET input is used for resetting the function. When this input is set to "True" or
when Reset counter is set to "reset", the CNT_VAL is forced to zero.

Application

When UDFCNT is connected to a relay binary input, two settings of binary input need
to be checked to ensure the counter is working correctly.
• Input # filter time. All pulses that are shorter than the filter time are not detected.
• Binary input oscillation suppression threshold. The binary input is blocked if the
number of valid state changes during one second is equal to or greater than the set
oscillation level value.
With the correct settings, UDFCNT can record correctly up to 20 pulses per second.
For example, to constantly record 20 pulses per second from slot X110 binary input 1,
when the pulse length is 25 ms pulse high and 25 ms pulse low time, the following
settings are recommended.
1MRS757644 F
620 series
Technical Manual