Kuhnke Electronics Instruction Manual

Thread usage
Function Libraries
A thread's program covers a number of tasks which are
more or less detached from others. Consequently, it also
allows you to separately program and run these tasks.
Try wrapping non-time-critical parts of the program into a
thread. This will shorten the runtime of PLC_PRG and,
thus, the intervals at which the process image and online
communication are refreshed.
Example:
You wish to turn a program module called "Thread1" into
a thread and have IN_00 run it. Add the following code
lines to the PLC_PRG module.
VAR
IN00_00 AT %IX0.0: BOOL;
Index1: WORD;
Tslice1: WORD;
Runs1: WORD;
Flag1: UINT:=255;
Start_Thread1: R_TRIG;
Activate_Thread1: BOOL;
END_VAR
Start_Thread1
( CLK:=IN_00,Q=>Activate_Thread1 );
IF Activate_Thread1 = TRUE THEN
Flag1:=0;
END_IF
IF Flag1 = 0 THEN
Index1:= INDEXOF ( Thread1 );
Flag1:= CREATE_THREAD
(Index1,Tslice1,Runs1);
END_IF
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