ABB UMC100.3 Manual page 36

36 C U S T O M A P P L I C AT I O N E D I T O R M A N U A L
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Function block reference
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Counter Up/Down
This block can be used to monitor discrete processes or quantity measurements with pulse generators. An internal, unsigned
16-bit counter contains the balance of the up and down pulses (CU, CD) since the last reset.
The overflow limits, both positive and zero, are monitored. If the counter value exceeds PV the overflow output QU is set. If
the counter value reaches 0 QD is set.
After a LOAD pulse, the configurable basic value PV is accepted as the initial counter value. After a reset RES the value 0
(zero) is set as the initial value. Reset is dominant.
A CU and CD signal at the same time does not change the counter.
Function Block
Inputs (from top to down)
Outputs (from top to down)
Parameters
Signal Name
CU: A positive edge increments the counter by one if PV is reached.
CD: A positive edge decrements the counter by one. If zero is reached the timer is not
further decremented and the QD output is set.
RES: A logical 1 resets the counter to zero.
LOAD: A positive edge loads the counter to the value PV
PV (WP): The initial counter value (0x0 ... 0xFFFF) when using LOAD.
QU: Output set to logical 1 if the counter reaches the predefined value PV.
QD: Output set to logical 1 if the counter reaches 0 (zero).
CV(W): Actual timer value
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Data Type
Boolean
Boolean
Boolean
Boolean
Word
Boolean
Boolean
Word