IDEC SmartRelay functions
IDEC SmartRelay Manual 149
Parameters T, T
L
,
T
!
and T
!L
Note the defaults of the T parameters listed in Chapter 4.3.2.
The off-delay time T, the permanent light time T
L
, the on-
delay prewarning time T
!
and the prewarning time period T
!L
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. The
timeb
ase is conf
igurable. For information on valid ranges
and parameter defaults, refer to Chapter 4.4.1.
Timing diagram
Functional description
A 0 to 1 transition at input Trg sets output Q.
If output Q = 0, and input Trg is set hi at least for
the duration
of T
L
, the permanent lighting function is enabled and output
Q is set accordingly.
The off-delay T is triggered when input Trg returns to 0
before T
L
has expired.
Output Q is reset when T
a
= T.
You can output an off-warning signal prior to the expiration
of the off-delay time (
T - T
!
) that resets Q for the duration of
the prewarning time period T
!L
. A subsequent signal at Trg
always resets T and the output Q.
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