Specifications

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Modicon
™
Momentum
™
automation platform
Concept
™
programming software
Functions
Sequential Function Chart (SFC) language
With the IEC 61131-3 sequential function chart (SFC) language, you can dene a
series of SFC objects that comprise a control sequence. Steps, transitions and
jumps in the sequence can be commented. Text can be freely placed within the
graphics. You can assign any number of actions to every step. A series of monitoring
functions – e.g., maximum and minimum monitoring time – can be integrated into
each step’s specications. The actions can be assigned an attribute symbol (as
required by IEC) to control the action’s performance after it has been activated –
e.g., a variable can be set to remain active after exiting.
Instruction List (IL)
With the IEC 61131-3 IL language, you can call entire functions and function blocks
conditionally or unconditionally, execute assignments and make conditional and
unconditional jumps within a program segment.
IL is a text-based language, and standard Windows
™
word processing tools can be
used to generate code. The IL editor also provides several word processing
commands. Keywords, separators and comments are spell-checked automatically
as they are entered. Detected errors are highlighted in color.
For custom function blocks (DFBs), the Concept
™
-DFB editor is used. In this editor,
you can create your own function blocks from EFBs or existing DFBs. DFBs created
in the IL editor can be recalled in the ST, LD, and FBD, DFBs created in the ST, LD,
and FBD editors can be recalled in the IL editor.
Structured Text (ST)
With the IEC 61131-3 ST language, you can call function blocks, execute functions
and assignments and conditionally execute and repeat instructions. The ST
programming environment is similar to Pascal. IL is a text-based language, and
therefore standard Windows word processing tools can be used to generate code.
The ST editor also provides several word processing commands. Keywords,
separators and comments are spell-checked automatically as they are entered.
Detected errors are highlighted in color.
Custom function blocks (DFBs) created with the ST editor can be called in the IL,
LD and FBD editors; DFBs created in the IL, LD and FBD editors can be used in the
ST editor.
Functions (continued)