Rockwell-automation 57C409 2 Channel Analog Input Module Bedienungsanleitung PDF herunterladen (Seite 21)

4Ć5

4.3.1 BASIC Task Example

This example will read an analog input from channel 0 once every

second and store the value in the symbol

CURRENT

VALUE%. The analog value will be digitized every .1

second.

1000 !

1002 ! common data declarations

1004 !

1005 COMMON ANALOG

INPUT 0% \!Data from channel 0

1010 COMMON CCLK

ENABLE 0@ \!Common clock enable Ć 0

1020 COMMON CCLK

ENABLE 1@ \!Common clock enable Ć 1

1030 COMMON UPDATE

TIME 0% \!Update period for channel 0

1040 COMMON INPUT

0 FILTER% \!Input filter for channel 0

1400 !

1450 ! local data declarations

1475 !

1500 LOCAL CURRENT

VALUE% \!Current value of analog input

1900 !

2000 INPUT

0 FILTER% = 2 \! 79 rad/sec crossover frequency

2010 UPDATE

TIME 0% = 200 \!.1 second conversion

2020 CCLK

ENABLE 0@ = TRUE \!Turn on the clock

2030 CCLK

ENABLE 1@ = TRUE \!Must turn on both outputs

2500 !

3000 ! Place any additional initialization statements here

4000 !

4001 ! The rest of the task is run every 1.0 seconds

4002 !

5000 START EVERY 1 SECONDS

5010 CURRENT

VALUE% = ANALOG INPUT 0%

1000 END

The symbolic names defined as COMMON" reference the inputs

defined in the configuration. The symbolic name CURRENT

VALUE%

is local to the BASIC task and does not have I/O associated with it.

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