Rockwell-automation 1771-DB BASIC MODULE Manual de usuario descargar pdf (Pagina 157)

100

101

Chapter

Statements

11 -5

Use the CLOCK1 statement to enable the free running clock resident on

the BASIC module. The special function operator TIME (page 9 -19)

increments once every 5 milliseconds after you execute CLOCK1.

CLOCK1 uses an internal timer to generate an interrupt once every

5 milliseconds. Because of this, the special function operator TIME has a

resolution of 5 milliseconds. The special function operator TIME counts

from 0 to 65535.995 seconds. After reaching a count of 65535.995

seconds TIME overflows back to a count of 0. The interrupts associated

with CLOCK1 cause the module programs to run at about 99.6% of normal

speed. This means that the interrupt handling for the free running clock

uses about 0.4% of the total CPU time.

Important: This does not include additional overhead for ONTIME user

interrupt handling execution.

Syntax

CLOCK1

Example

>10

TIME = 0

15 DBY(71) = 0 :REM RESET NONINTEGER PORTION OF TIME

20 CLOCK1

30 ONTIME 2,100

40 DO

>50

WHILE TIME < 10

END

100 PRINT “TIMER INTERRUPT AT – ”,TIME,“ SECONDS”

110 ONTIME TIME+2,100

120 RETI

READY

>RUN

TIMER INTERRUPT AT – 2.01 SECONDS

TIMER INTERRUPT AT – 4.015 SECONDS

TIMER INTERRUPT AT – 6.01 SECONDS

TIMER INTERRUPT AT – 8.01 SECONDS

TIMER INTERRUPT AT – 10.01 SECONDS

CLOCK1

1 2 ... 152 153 154 155 156 157 158 159 160 161 162 ... 393 394

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