Chapter 9—C445 Logic Engine and Expansion I/O
182
Power Xpert C445 Global Motor Management Relay
MN042003EN—January 2019
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Timers and Counters Group
CTD—Down Counter
The CTD function block is a down counter that decrements the counter value (CV) by one
at the rising edge of the count down (CD) trigger. The counter value is preloaded with the
preset value (PV) at the rising edge of load preset (LD) trigger. The counter value is
persistent through power cycle of the device.
Parameter
Data type
Description
CD
BOOL
Count down trigger – rising edge
LD
BOOL
Trigger to preload counter with PV
PV
INT
Preset value
OUT
BOOL
Countdown complete flag
CV
INT
Counter value
Powe
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