IDEC SmartRelay functions
IDEC SmartRelay Manual
151
Calculation 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.
Default on/off parameters
The default limits for the on and/or off parameters can be de-
rived from another, already programmed function. You can
use the actual values of the following functions:
•
Analog comparator (actual value Ax - Ay, see Chapter
4.4.18)
•
Analog trigger (actual value Ax, see Chapter 4.4.16)
•
Analog amplifier (actual value Ax, see Chapter 4.4.20)
and
•
Up/down counter (actual value Cnt).
Select the required function by means of the block number.
For information on parameter defaults, refer to Chapter
4.4.1.
Note
The system scans the counter limit value cyclically.
Thus, if the pulse frequency at the fast inputs I5/I6 is faster than the
cycle time, the special function might not switch until after the spec-
ified 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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