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6.3 How to Use Retentive Timers
When an input condition is turned on, the coil is energized. Then the value of a
retentive timer starts increasing. When the current value reaches the set value, the
retentive timer goes time-out and the contact turns on. When the input condition is
turned off during the increasing, the coil is de-energized but the current value is kept.
When the input condition is turned on again, the coil is re-energized and the current
value is accumulated.
Project name Retentive timer
Program name MAIN
X6
ST1
K50
ST1
Y73
X7
Contact X6
Coil ST1
Normally open contact ST1
3.0sec. 2.0sec.
Contact X7 (for input RST instruction)
Current
value of ST1
0335 50
Only the RST instruction is available for turning off the contact
and clearing the current value after the retentive timer goes time-out.
When using the program as a
retentive timer, specify the points
in parameters in advance.
RST ST1
In the example below, the retentive timer is set to ST0 to ST31.
1) Double-click "Parameter" in the project list.
1) Double-click!
2) Double-click!
(To the next page)
2) "PLC Parameter", the "Network Parameter"
folder, and "Remote Password" are displayed.
Double-click the "PLC Parameter".