Mitsubishi Electronics 700 Series, FR-A700 specifications Timer timing method

Models: FR-A700 700 Series

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Description of devices

(2)Present value update timing and accuracy in refresh system

1)The timer accuracy is +2 scan times independently of the used timer and scan time.

2)The following shows the present value update timing and accuracy when the 10ms timer is used in a program where the scan time is 10ms or more.

Ladder example

T3 contact turns on 6s after X0 turns on. (T3 is 10ms timer.)

Timer timing method

Scan time 25ms

END

OUT

 

OUT

 

OUT

END

 

OUT

END

 

 

When external

 

T3

 

END T3

END T3

END T3

 

 

 

25ms

 

25ms

 

 

25ms

 

 

 

 

25ms

 

 

 

input turns on

 

ON

 

 

 

 

 

 

 

 

 

in hatched

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

range

OFF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

X0

 

 

ON

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

T3 coil

OFF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ON

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

T3 contact

OFF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10ms timer

 

1

2

1

2

3

 

1

2

1

2

1

 

2

3

 

 

timing

 

 

 

 

 

Timing set

 

 

 

2

 

 

3

 

 

2

 

2

 

 

3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

at END

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

T3 present

 

 

 

 

 

0

3

3

3

2

5

597

2

599

599

3

602

 

 

 

 

 

 

 

 

 

 

 

 

*1

 

 

 

 

value

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1 scan

 

 

 

 

 

*2

 

 

 

 

 

 

6000ms

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1 scan

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

600 appears when monitored on peripheral device.

Fig 3.17 Timer Timing Method

In Fig. 3.8, the time-out period of the 10ms timer T3 has the following errors. *1 .......... 10ms timer error (+1 scan time)

*2 .......... Error produced by timer's input condition ON timing and OUT

T instruction's program position (+1 scan time) The accuracy is +2 scan time (+0.05s in Fig. 3.8)

3)When the timer times out, its contact remains on until END even if the coil turns off, and turns off at execution of the END instruction.

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Page 87
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Mitsubishi Electronics 700 Series, FR-A700 specifications Timer timing method