Features Of St Program In Melsec-Q/L Series - Mitsubishi Electric MELSEC Q Series Programming Manual

1 OVERVIEW

1.2 Features of ST Program in MELSEC-Q/L Series

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ST programs are described in ST language.
Using GX Developer to perform ST programming enables efficient programming to be
performed in excellent operation environment. The following provides the main
features of ST programs in the MELSEC-Q/L series.
(1) Design efficiency improved by defining processing as parts
With often used processing defined as parts in the form of function blocks (FB) in
ST language, they can be used in necessary areas of each program. This not
only enhances the efficiency of program development but also reduces program
mistakes, improving program quality.
For more information, refer to the "GX Developer Operating Manual (Function
Block)" given in Relevant Manuals.
(2) Restoration of ST program read from PLC
In the MELSEC-Q/L series, the created ST program is written to the PLC and
executed, and can be read from the PLC and then restored to enable editing in
the ST language format.
(3) Program change during system operation (online change)
Part of a running program can be changed without the PLC CPU being stopped.
(4) Connection with other language programs
Since the MELSEC-Q/L series also supports languages other than the ST, the
language adequate for processing can be used to create efficient programs.
Execution conditions can be set on a file basis in each program, and multiple
program files can be written to a single PLC CPU.
Multiple languages support widespread application under optimum control.
(5) A wealth of functions group
The MELSEC functions compatible with various common instructions for the
MELSEC-Q/L series and the IEC functions defined in IEC61131-3 are available
for ST programs in the MELSEC-Q/L series.
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