Automatic control function programming manual ladder language

General Purpose Functions
6.38 Initialise the Base Associated with the %Y Variables y_init
Syntax
y_init(&y_start_address)
y_start_address: Address loaded in the base associated with the %Y variables.
Loads the base associated with the %Y variables with the address passed as parameter.
Operation
The %Y variables can replace any %M, %V, %I, %Q, %R and %W global variables. The programmer must initialise
the base by function y_init(..) before using the %Y variables.
The use of function y_init(..) inhibits visibility of any local variables of the %SP module. To recover visibility, proceed
as follows:
Var_1 = %Y0.& Saves the base in Var_1 (e.g.: %V100.L).
y_init(Var_2 + 100) The base points to a new variable area.
...... Use of new %Y variables.
y_init(Var_1) Restore the base.
...... Use of local %Y variables.
REMARK Loading of a base associated with the %Y variables by function y_init is only possible
during execution of the task (%TS, %TF, %TH or %INI) using the variables.
Example:
- If the %Y variables are used in task %TS0, function y_init must be called each time
task %TS0 is executed
- If the %Y variables are used in a looped TF background task (iterative background
task), function y_init only needs to be called once at the beginning of the task.
Example of Use of y_init(..) and %Y
Processing of 8 axis groups with a single %SP0 using %Y variables
y_init(%R100.&) %Y0.B replaces %R100.B %Y80.B replaces %W100.B
sp(0) Processing of axis group 1
y_init(%R200.&) %Y0.B replaces %R200.B %Y80.B replaces %W200.B
sp(0) Processing of axis group 2
y_init(%R800.&) %Y0.B replaces %R800.B %Y80.B replaces %W800.B
sp(0) Processing of axis group 8
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