IDEC SmartRelay functions
144 IDEC SmartRelay Manual
4.4.8 Random generator
Short description
The output of the random generator is se
t or reset within a
configured time.
Parameter T
H
and T
L
Note the defaults of the T
H
and T
L
parameters listed in
Chapter 4.3.2.
The on-delay time TH and the off-delay time TL can be
p
ro
vided 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 va
lue 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. The
timeb
ase is configurable. For information on valid ranges
and parameter defaults, refer to Chapter 4.4.1.
Symbol in IDEC
SmartRelay
Wiring Description
Input En A positive edge ( 0 to 1 transition) at
input En (Enable) triggers the on-
delay time of the random generator.
A negative edge ( 1 to 0 transition) at
input En (Enable) triggers the off-
delay time of the random generator.
Parameter The on-delay is set at random to a
value between 0 s and T
H
.
The off-delay is set at random to a
value between 0 s and T
L
.
Output Q Output Q is set when the on-delay
has expired and if En is still set. It is
reset when the off-delay has expired,
provided En was not set again
meanwhile.
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