ABB RER620 Technical Manual page 360

Section 5
Control functions
354
UP_CNT
DOWN_CNT
LOAD
RESET
Figure 190: 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, then the counter value
CNT_VAL is unchanged. The CNT_VAL is available through the Monitored data view.
The counter value CNT_VAL is stored in a non-volatile 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. Till 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 setting
Counter load value. DNCNT_STS is set to TRUE when the CNT_VAL is equal to zero.
The RESET input is used for resetting of the function. When this input is set to TRUE or
when the Reset counter is set to "reset" the CNT_VAL is forced to zero.
Up-down UPCNT_STS
counter DNCNT_STS
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RER620
Technical Manual