IDEC SMARTRELAY User Manual page 182

IDEC SmartRelay functions
4.4 Special functions list - SF
Functional description
The internal counter increments (Dir
positive edge at input Cnt.
ou can use input R to reset the internal count value to the start value. As long as R
output is also 0 and the pulses at input Cnt are not counted.
If retentivity is not set, output
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
If the On threshold < Off threshold, then
Note
The system scans the counter limit value cyclically.
Thus, if the pulse fre uency 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
1000. (The output would not be set at all if the value 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):
170
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Off threshold, then:
1, if Cnt On
0, if Cnt < Off
950 Off 10000. The output is set in the next cycle, after the value has reached
0) or decrements (Dir
and the expired time are reset after a power failure.
1, if On
1) by one count with every
Cnt < Off.
980).
IDEC SmartRelay Manual
1, the