Rockwell-automation 57C409 2 Channel Analog Input Module Instrukcja Użytkownika Pobierz pdf (Strona 23)

4Ć7

4.4.1 BASIC Task Example

The following is an example of a BASIC task that handles interrupts

from channel 0 from the input module.

1000 !

1002 ! common data declarations

1003 !

1004 COMMON ANALOG

INPUT 0% \!Data from channel 0

1005 COMMON ISCR

CHANNEL 0% \!Interrupt status & control 0

1010 COMMON CCLK

ENABLE 0@ \!Common clock enable 0

1015 COMMON CCLK

ENABLE 1@ \!Common clock enable 1

1020 COMMON UPDATE

TIME 0% \!Update period for channel 0

1025 COMMON INPUT

0 FILTERS% \!Input filter for channel 0

1100 !

1150 ! local data declarations

1175 !

1200 LOCAL ANALOG

VALUE% \!Analog value

2000 !

2001 !set up the conversion parameters

2002 !

2011 INPUT

0 FILTER% = 2 \!79 rad/sec filter

2900 !

2950 ! The following statement connects the name CHANNEL 0 EVENT

3000 ! to the interrupt defined in ISCR

CHANNEL 0%. The event name

3001 ! should be as meaningful as possible. The watchdog timeout has

3002 ! been set to 120 clock ticks (660 msec). 1 tick

3003 ! equals .0055 seconds. If the time between

3004 ! interrupts exceeds this value, a bus error will

3005 ! be indicated on the processor's LED and the system

3006 ! will be stopped. For more information refer to

3007 ! the Enhanced BASIC Instruction manual (JĆ3675).

3008 !

3010 EVENT NAME=CHANNEL

0 EVENT, &

INTERRUPT

STATUS=ISCR CHANNEL 0%, TIMEOUT=120

4000 !

4001 UPDATE

TIME 0% = 1000 \!Convert every .5 seconds

4002 ! The following statements enable common clock" on this module.

4003 ! If there is more than one interrupt task in a chassis, the

4004 ! task that enables common clock" should always be the lowest

4005 ! priority task.

4006 !

4010 CCLK

ENABLE 0@ = TRUE \!Turn on the clock

5000 !

5001 ! Place any additional initialization statements here

5002 !

6000 !

6001 ! The next statement synchronizes the task with the external

6002 ! event via the interrupt. Task execution will be suspended

6003 ! until the interrupt occurs. If this task is the highest

6004 ! priority task waiting to execute at the time of the

6005 ! interrupt, it will become active. If it is not the highest

6006 ! priority task, it will remain suspended until all higher

6007 ! priority tasks have executed, at which point it will become

6008 ! active.

6009 !

6010 WAIT ON CHANNEL

0 EVENT

7000 !

7001 !

7002 ! The next statement performs the interrupt service routine

7003 !

7010 ANALOG

VALUE% = ANALOG INPUT 0%

8000 GOTO 6010

10000 END

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