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C Programs
88 CIMPLICITY Logic Developer - PLC Version 4.00 GFK-1918D
5
C PROGRAMS
Note: C programs are supported only on Series 90™-70 CPUs, firmware release
6.00 and later.
A C program is an independent section of executable code, written in C language,
that is downloaded to and executed on the associated target PLC. To develop a C
program, use GE Fanuc's C Programmer's Toolkit for Series 90 PLCs User's Manual
(GFK-0646). You then import it into a project.
A C program has access to all the % reference tables of the PLC except for the
_MAIN LD block’s %P memory and the %L memory of any other LD block. A C
program can also call any of the numerous PLC-embedded function blocks, which
are included in the C Programmer’s Toolkit.
A C program cannot be called as a subroutine. Execution is controlled only
through scheduling. A C program cannot call another block as a subroutine.
By setting the parameters of a C program, you enable it to access memory directly.
When a C program begins to execute, it reads the data for all the parameters and
makes a copy of the data. If the C program’s execution is interrupted or time-sliced
over multiple scans, the C program, when it resumes execution, uses the copy of
the data that it made upon beginning to execute.
You can add C programs to a Series 90™-70 target only if the _MAIN block is an
LD block. The LD program is then treated as a user program, which can be
scheduled. The maximum number of C programs you can add is 15.
If you have State Logic on a Series 90™-70 target, it is compiled into a C Program
called _STATE, whether State Logic coexists with LD logic or not. If State Logic
does not coexist with LD logic, _STATE is the only C program supported by the
target.
C programs can coexist with State Logic on a Series 90™-70 PLC. For such a
target, the State Logic is compiled into a C program. This C program is named
_MAIN if there is no LD logic; however, if State Logic coexists with LD logic, the
State Logic is compiled into a C program named _STATE and one LD block must
be named _MAIN.
User Programs
User programs consists of:
■
C programs
■
The LD program, if the _MAIN block is an LD block.
Navigator: Project Tab
A C Program