IDEC FL1E-H12RCA User Manual page 176

IDEC SmartRelay functions
Parameters On and Off
The on threshold On and the off threshold Off can be
provided by the actual value of 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)
• Analog multiplexer (actual value AQ, see Chapter 4.4.26)
• Analog ramp control (actual value AQ, see Chapter
4.4.27)
• Analog math (actual value AQ, see Chapter 4.4.30)
• PI controller (actual value AQ, see Chapter 4.4.28)
• Up/down counter (actual value Cnt, see Chapter 4.4.13)
Select the required function by the block number.
Timing diagram
R
Cnt
Dir
On=Off=5
StartVal
Q
Functional description
The internal counter increments (Dir = 0) or decrements (Dir
= 1) by one count with every positive edge at input Cnt.
You 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 Q and the expired time are
reset after a power failure.
Q 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:
•
Q = 1, if Cnt  On
Q = 0, if Cnt < Off.
• If the On threshold < Off threshold, then Q = 1,
if On  Cnt < Off.
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Internal count
value Cnt
IDEC SmartRelay Manual