Remote-processing CAMBASIC Manual do Utilizador descarregar pdf (Página 204)

Event Multitasking - 15

executed and then go low.

The PU LSE function r eturns the rem aining time of each stage. The example below demonstrates this.

10 PULSE 0,0,1,.05,1

30 A = PULSE(0):IF A=0 THEN STOP

40 PRINT A

50 GOTO 30

RUN

.03

.02

.01

5E-03

STOP

Operation o f a Multiple P ulsed Outpu ts

The real power of the PULSE operation comes when it is combined with the ON INP tasking statement and multiple timed

outputs are required. The application could involve pneumatic valves, injection molding steps or other sequence– oriented

operations. T he following (lame) ex ample sim ulates a dru m timer by turning on outputs w hen a previous timed pulse is

complete. The job here is a bag sealing operation. A pre-heater is started and sealing head is brought down when the start

switch is pressed. After the pre-heater is timed out, the heater is turned on for a second. The head is down for 4 seconds.

When the head is done, an interrupt is generated which moves the package to the next place. Opto rack positions 0-4 are

used to control a sealing head, pre-heater, heater, and pusher.

CONFIG PIO 1,0,0,0,0,0

'Detect start switch

ON INP 0,0,1,1 GOSUB ..start

'Detect emergency or STOP switch

on inp 1,0,2,2 gosub ..emergency

'Generate interrupt when head goes up

on inp 2,2,2,1 GOSUB ..headup

'Generate interrupt when pre-heat done

on inp 3,1,1,2 gosub ..preheat

'rest of program

..start

'Start switch was pushed. Now start sequence

bit 2,4,1 :'reset bag pusher

pulse 0,2,0,2,0 :'turn on pre-heat for 2 seconds

pulse 1,2,1,4,0 :'Bring down sealing head for 4 seconds

return

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Remote-processing CAMBASIC Manual do Utilizador Página 204