Toshiba T2N User Manual download pdf (Page 123)

2.INTERNAL OPERATIONS

110 PROSEC T2N

The timer register used in the timer instruction is updated (increased), and the

timing relay within the special relays (S0040 - S0047) is updated.

• updating the timer register

The number of system interrupts which occur during the timer update cycle

(

scan cycle) are counted and these counts are added up in the timer register

which is started up by the timer instruction (TON, TOF, SS, TRG).

The 10msec system interrupt is used for the timer update. The timer reset and

the time up processing are performed when running the timer instruction.

timer

classification

timer register

(timer device)

preset range

Notes

0.01 second

timer

T000~T063

(T.000~T.063)

0~32767

(0~327.67 seconds)

0.1 second

timer

T064~T511

(T.064~T.511)

0~32767

(0~3276.7 seconds)

on delay timer (TON)

off delay timer (TOF)

single shot timer (SS)

timer trigger (TRG)

*) Take the criteria for the time for performing the timer register update

as follows.

22µs/timer register (update time)

• Timing relay update

The timing relay (S0040 - S0047) ON/OFF status is controlled by using the

10msec system interrupt. The binary counter is configured as shown on the

next page. (When RUN is started up, they are all OFF.)

2.4.3

Timer update

10msec system interrupt

timer timer timer

scan cycle scan cycle

timer update timer update

scan

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Toshiba T2N User Manual Page 123

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