90
90
90
90
Analog ramp: AQ
Analog math: AQ
PI controller:AQ
Data latching relay: AQ
Up/Down counter: Cnt
The value of ＂ On ＂，＂ Off ＂ and ＂ Cnt ＂ can be set/modified in parameter mode. For
information about how to modify ,refer to chapter 5 .2.2 please.
Timing
Timing
Timing
Timing diagram
diagram
diagram
diagram
Description
Description
Description
Description of
of
of
of the
the
the
the function
function
function
function
The function increments (Dir = 0) or decrements (Dir = 1) the internal counter by one count
with every positive edge at input Cnt.
You can reset the internal counter value to '000000', with a signal at the reset input R. As long
as R=1, the output is 0 and the pulses at input Cnt are not counted.
Output Q is set and reset according to the actual value at Cnt and the set thresholds. See the
following rules for calculation.
Calculation
Calculation
Calculation
Calculation rule
rule
rule
rule
• If the on threshold >= off threshold, then:
Q = 1, if Cnt >= On
Q = 0, if Cnt < Off.
• If the on threshold < off threshold, then:
Q = 1, if On <= Cnt < Off.
Caution
Caution
Caution
Caution
The function polls the limit value of the counter once in each cycle.
Thus, if the pulses at the fast inputs (ELC-12) or IB/IC(ELC-18) are faster than the scan cycle
time, the SFB might not switch until the so specified limit has been 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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