IDEC SmartRelay functions
4.4 Special functions list - SF
IDEC SmartRelay Manual
170
Functional description
The internal counter increments (Dir 0) or decrements (Dir 1) by one count with every
positive edge at input Cnt.
ou can use input R to reset the internal count value to the start value. As long as R 1, the
output is also 0 and the pulses at input Cnt are not counted.
If retentivity is not set, output and the expired time are reset after a power failure.
is set or reset depending on the current value at Cnt and the set thresholds. See the
calculation rule below.
Calculation rule
If the On threshold Off threshold, then:
1, if Cnt On
0, if Cnt < Off
If the On threshold < Off threshold, then 1, if On Cnt < Off.
View in programming mode (example):
If the referenced block (B021, in the example) returns a value that lies out of the valid range,
the value is rounded to the next valid value.
The view in parameter assignment mode (example):
Note
The system scans the counter limit value cyclically.
Thus, if the pulse freuency at the fast digital inputs I3, I4, I5 or I6 is faster than the cycle
time, the special function might not switch until after the specified limit value is exceeded.
Example: Up to 100 pulses per cycle can be counted 900 pulses have been counted so
far. On 950 Off 10000. The output is set in the next cycle, after the value has reached
1000. (The output would not be set at all if the value Off 980).
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