User Manual

IDEC SmartRelay functions
IDEC SmartRelay Manual 135
4.4.2 Off-delay
Short description
When an on-delay is set, the output is reset when the
configu
red time has expired.
Parameter T
Note the parameter T defaults s
pecified in Chapter 4.3.2.
The time for parameter T can be based on the actual value
of ano
ther, already-configured function. You can use the
actual value 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 configurable. For information on valid timebase
ranges and parameter preset, refer to Chapter 4.4.1.
Trg
T
TT
a
expires
Q
R
The bold section
of the timing
diagram also
appears in the
off-delay symbol.
Timing diagram
Symbol in IDEC
SmartRelay
Wiring Description
Input Trg The off-delay timer starts with a
negative edge (1 to 0 transition) at
input Trg (Trigger)
Input R A signal at input R resets the on-
delay time and the output.
Parameter The output switches off (transitions
from 1 to 0) when the delay time T
expires.
Retentivity: 
/ = No retentivity
R = The status is retentive.
Output Q Q is set with a signal at input Trg. It
holds this state until T has expired.