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FX Series Programmable Controllers Devices in Detail 4
4-17
4.9.3 Retentive Timers
A retentive timer has the ability to retain the currently reached present value even after the
drive contact has been removed. This means that when the drive contact is re-established a
retentive timer will continue from where it last reached.
Because the retentive timer is not reset when the drive contact is removed, a forced reset must
be used. The following diagram shows this in a graphical format.
Using timers in interrupt or ‘CALL’ subroutines:
• Please see page 4-18.
Available devices:
• Please see the information table on page 4-15.
X0
Y0
1.23 s
t1 t2
X1
Y1
X2
t1 + t2 = 34.5s
X0
T20
T20
K123
X1
T250
K345
X2
T250RST
Y0 Y1
T250
Present value
Present value
Non-retentive timer operation
Retentive timer operation