Basic Characteristics RAPID

Data Basic Characteristics RAPID
5.3 Persistent declaration
Persistents can only be declared at module level, not inside a routine, and must be given
an initial value. The initialisation value must be a single value (without data or operands),
or a single aggregate with members which, in turn, are single values or single
aggregates.
Example: PERS pos refpnt := [100.23, 778.55, 1183.98];
Persistents of any type can be given an array (of degree 1, 2 or 3) format by adding
dimensional information to the declaration. A dimension is an integer value greater
than 0.
Example: PERS pos pallet{14, 18};
Note that if the value of a persistent is updated, this automatically causes the initialisation
value of the persistent declaration to be updated.
Example: PERS num reg1 := 0;
...
reg1 := 5;
After execution, the program looks like this:
PERS num reg1 := 5;
...
reg1 := 5;
5.4 Constant declaration
A constant is introduced by a constant declaration. The value of a constant cannot be
modified.
Example: CONST num pi := 3.141592654;
A constant of any type can be given an array (of degree 1, 2 or 3) format by adding
dimensional information to the declaration. A dimension is an integer value greater
than 0.
5.5 Initiating data
Example: CONST pos seq{3} := [[614, 778, 1020],
[914, 998, 1021],
[814, 998, 1022]];
In the table below, you can what is happening in various activities, e.g. warm and cold
start.
5-22 RAPID Reference Manual