10.9.3.1
Example
In the example, an Off-Delay Timer is used to turn off an output (%Q00001) whenever an
input (%I00001) turns on. The output is turned on again 0.3 seconds after the input goes
off.
CONST
+00003
OFDT
PV
%R00019
%I00001
%Q00001
CV
0.10
10.9.3.2
Operation of the Off-Delay Timer Function
ENABLE
Q
A
B
C
D
E
F G
H
A.
ENABLE and Q both go high; timer is reset (CV = 0).
B.
ENABLE goes low; timer starts accumulating time.
C.
CV reaches PV; Q goes low, and timer stops accumulating time.
D.
ENABLE goes high; timer is reset (CV = 0).
E.
ENABLE goes low; timer starts accumulating time.
F.
ENABLE goes high; timer is reset (CV = 0).
G.
ENABLE goes low; timer begins accumulating time.
H.
V reaches PV; Q goes low, and timer stops accumulating time.
10.9.3.3
Parameters of the Off-Delay Timer Function
Input/ Output
Choices
Description
address
R
The function uses three consecutive words
(registers) of %R memory to store the following:
• Current value (CV) = word 1.
• Preset value (PV) = word 2.
• Control word = word 3.
Do not use this address with other instructions.
Careful: Overlapping references cause erratic
operation of the timer.
enable
flow
When enable receives power flow, the timer’s
current value is incremented.
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