Basic Characteristics RAPID

Basic Characteristics RAPID Multitasking
MODULE module1
PERS BOOL startsync:=FALSE;
PROC main()
SetDO do1,1;
.
ENDPROC
ENDMODULE
TASK 1
MODULE module2
LOCAL VAR intnum isiint1;
PROC main()
CONNECT isiint1 WITH isi_trap;
ISignalDI di1, 1, isiint1;
WHILE TRUE DO
WaitTime 200;
ENDWHILE
ENDPROC
TRAP isi_trap
.
ENDTRAP
ENDMODULE
11.2 Intertask communication
All types of data can be sent between two (or more) tasks with persistent variables.
A persistent variable is global in all tasks. The persistent variable must be of the same
type and size (array dimension) in all tasks that declared it. Otherwise a runtime error
will occur.
All declarations must specify an init value to the persistent variable, but only the first
module loaded with the declaration will use it.
Example
TASK 0
MODULE module1
PERS BOOL startsync:=FALSE;
PERS STRING stringtosend:=””;
PROC main()
RAPID Reference Manual 5-41