Rockwell-automation MMCL Using the Mining, Mineral, and Cement Library Instrukcja Użytkownika Pobierz pdf (Strona 16)

Publication RA-UM002B-EN-P - November 2010

16 Developing an RSLogix 5000 Application

Grouping of Programs

For a clear program structure, it is recommended, to specify separate programs

for each Control Group. To start a new program, right-click the MainProgram

and select New Routine.

A Control Group may also be split functionally, using a ladder program, for

motor control I/O status and interlocking, a Sequential Function Chart

(SFC), for module start and stop sequences (including structured text) and a

Function Block Diagram (FBD), for analog process controls. The different

methods are supported by the corresponding RSLogix 5000 Editors. The

MMCL Add-On Instructions are available for Ladder, Function Block and

Structured Text.

For automatic start and stop sequences, use an SFC, especially if devices

must be stopped individually, rather than by a common shutdown command.

If, however, a common shutdown or delay time is suitable, then an SFC is not

required and a group can be stopped by the Control Group's built-in

stop-delay timer, using standard ladder interlocking only.

For analog signal processing, use a FBD, which is more comprehensive,

showing the signal flow better than a Ladder diagram.

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Rockwell-automation MMCL Using the Mining, Mineral, and Cement Library Instrukcja Użytkownika Strona 16