Mitsubishi Electronics FR-A700, 700 Series Timer processing method and accuracy, Timing Chart

Description of devices

(2)100ms retentive timers

1)A 100ms retentive timer is designed to time the ON period of the timer coil. When its coil turns on, the timer starts timing the present value and maintains the present value and contact ON/OFF state if the coil turns off.

When the coil turns on again, the timer resumes timing from the maintained present value.

2) Use the RST T instruction to clear the present value and turn off the contact.
Ladder example
			Times ON of X5 for 20s.
			Resets T5 contact and clears
			present value when X6 turns on.
Timing chart
		ON	ON
X5	OFF	OFF	OFF
		ON	ON
T5 coil	OFF	OFF	OFF
			Setting
Timer present
value		15s	5s
			ON
T5 contact	OFF		OFF

Fig 3.16 Timing Chart

3.9.6Timer processing method and accuracy

(1)Timer processing method

The coil of the timer is turned on/off at execution of the OUT T instruction, and the timer's present value is updated and its contact turned on/off at execution of the END instruction.

1)When the coil of the timer turns on, the present value of that timer is updated after execution of the END instruction, and when the timer times out, its contact turns on.

(a)When the coil of the 10ms or 100ms timer turns off, the present value of that timer is reset to 0 and the contact is also turned off after execution of the END instruction.

(b)If its coil turns off, the 100ms retentive timer maintains the prevent value and contact ON/OFF state.

2)When the timer is reset by the RST instruction, the present value of the timer is reset to 0 and the contact turns off too at execution of the RST T instruction.

POINT

If the timer setting is "0", the setting becomes infinite and the timer does not time out.

SEQUENCE PROGRAMMING

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