GE VersaMax PLC User Manual page 188

Input/ Output
address
enable
PV
Q
time
188 GFK-1503E
For public disclosure
10.9.2.1 Parameters for the On Delay Timer Function
Choices
R
flow
I Q, M, T, G, R, AI, AQ,
constant, none
flow, none
tenths (0.1), hundredths
(0.01), or thousandths
(0.001) of seconds
10.9.2.2 Operation of the On-Delay Timer Function
ENABLE
Q
A B
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.
Description
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.
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 is the value to copy into the timer's preset
value when the timer is enabled or reset.
Output Q is energized when TMR is enabled and
the current value is greater than or equal to the
preset value.
Time increment for the low bit of the PV preset
and CV current value.
D
C E
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VersaMax PLC User Manual