IDEC SmartRelay functions
146 IDEC SmartRelay Manual
4.4.9 Stairwell Light Switch
Short description
An input edge triggers a configurable and retriggerable time.
The output is r
eset after this time has expired. A warning
signal can be output before this time has expired to warn of
the impending shutdown.
Parameter T, T
!
and T
!L
Note the defaults of the T parameters listed in Chapter 4.3.2.
The off-delay time T, the pre-warning time T
!
and the pre-
warning 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 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 Trg A signal at input Trg (Trigger) triggers
the off-delay time for the stairwell Light
Switch.
Parameter T represents the off-delay time of the
output (output signal transition 1 to 0).
T
!
determines the triggering time for
the pre-warning.
T
!L
determines the length of the pre-
warning signal.
Retentivity:
/ = No retentivity
R = The status is retentive.
Output Q Q is reset after the time T has expired.
A warning signal can be output before
this time has expired.
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