Rockwell-automation 57C400-1 115V AC/DC Input Module Manual de usuario descargar pdf (Pagina 16)

4Ć2

The frequency with which tasks read their inputs and write their

outputs depends on the language being used. Ladder logic and

control block tasks read inputs once at the beginning of each scan

and write outputs once at the end of scan. BASIC tasks read an input

and write an output for each reference throughout the scan.

4.3.1 Ladder Logic Task Example

STARTPBLIGHT

1050

run

The symbolic names LIGHT and STARTPB reference the input

modules that were defined in the configuration. The trailing at symbol

@" is not used in ladder logic tasks. The symbolic name run" is

local to the ladder logic task and does not have I/O associated with it.

4.3.2 BASIC Task Example

1000 COMMON LIGHT@ \!Fault light

1010 COMMON STARTPB@ \!Start PushĆbutton

2000 LOCAL RUN@ \!Line run

3000 !

4000 !

5000 RUN@ = NOT LIGHT@ AND ( STARTPB@ OR RUN@)

5500 !

6000 END

The symbolic names LIGHT@ and STARTPB@ reference the input

modules that were defined in the configuration. The symbolic name

RUN@ is local to the BASIC task and does not have I/O associated

with it.

4.3.3 Control Block Task Example

2400 COMMON STARTPB@ \!Start pushĆbutton

2500 LOCAL MOMENTARY@ \!Momentary output

3000 !

5000 CALL TRANSITION( INPUT=STARTPB@,

OUTPUT=MOMENTARY@)

5500 !

6000 END

The symbolic name STARTPB@ references the input module that

was defined in the configuration. The symbolic name

MOMENTARY@ is local to the control block task and does not have

I/O associated with it.

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 35 36

Sin comentarios

Rockwell-automation 57C400-1 115V AC/DC Input Module Manual de usuario Pagina 16