GE VersaMax PLC, User Manual

Page: 188 / 318

10.9.2.1 Parameters for the On 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. When the TMR is
not enabled, the current value is reset to zero and
Q is turned off.
PV
I Q, M, T, G, R, AI, AQ,
constant, none
PV is the value to copy into the timer’s preset
value when the timer is enabled or reset.
Q
flow, none
Output Q is energized when TMR is enabled and
the current value is greater than or equal to the
preset value.
time
tenths (0.1), hundredths
(0.01), or thousandths
(0.001) of seconds
Time increment for the low bit of the PV preset
and CV current value.
10.9.2.2 Operation of the On-Delay Timer Function
ENABLE
Q
a42933
A B C
D
E
A. ENABLE goes high; timer begins accumulating time.
B. Current value reaches preset value PV; Q goes high, and timer continues
accumulating time.
C. ENABLE goes low; Q goes low; timer stops accumulating time and current
time is cleared.
D. ENABLE goes high; timer starts accumulating time.
E. ENABLE goes low before current value reaches preset value PV; Q remains
low; timer stops accumulating time and is cleared to zero (CV=0).
10.9.2.3 Example
In the example, a delay timer (with address) TMRID is used to control the length of time
that coil is on. This coil has been assigned the Nickname DWELL . When the normally
open (momentary) contact with the Nickname DO_DWL is on, coil DWELL is energized.
188 GFK-1503E VersaMax PLC User Manual
For public disclosure