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IDEC SmartRelay functions
Parameters TH and TL
Note the preset values for the parameters TH and TL in
Chapter 4.3.2.
The on-delay and off-delay times for parameters TH and TL
can be based on the actual value of another, alreadyconfigured 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. The
timebase is configurable. For information on valid timebase
ranges and parameter preset, refer to Chapter 4.4.1.
Timing diagram
Trg
Q
TH
TH
TH
The bold section of
the timing diagram
is also shown in the
on/off-delay
symbol.
Ta expires
TL
TL
TL
Ta expires
Functional description
The time TH is triggered with a 0 to 1 transition at input Trg.
If the status at input Trg is 1 at least for the duration of the
time TH, the output is set to 1 on expiration of the time TH (the
output follows the input with on-delay).
The time is reset when the signal at input Trg is reset to 0
before the time TH has expired..
A 1 to 0 transition at input Trg triggers the time TL.
If the status at input Trg is 0 at least for the duration of the
signal TL, the output is set to 0 on expiration of the time TL
(the output follows the input with off-delay).
The time is reset when the signal at input Trg changes to 1
again before the time TL has expired.
If retentivity is not set, output Q and the expired time are
reset after a power failure.
IDEC SmartRelay Manual
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