Omron SCARA YRCX Series, Programming Manual, Page: 305 / 506

8
SUB to END SUB 8-213
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125 SUB to END SUB
Defines a sub-procedure
Format
SUB label (dummy argument, dummy argument...)
command block
END SUB
Explanation Defines a sub-procedure.
The sub-procedure can be executed by a CALL statement. When the END SUB
statement is executed, the program jumps to the next command after the CALL
statement that was called. Definitions are as follows.
1. All variables declared within the sub-procedure are local variables, and these are
valid only within the sub-procedure. Local variables are initialized each time the
sub-procedure is called up.
2. Use a SHARED statement in order to use global variables (program level).
3. Use a <
dummy argument > when variables are to be passed on. If two or more
dummy arguments are used, separate them by a comma ( , ).
4. A valid < dummy argument > consists of a name of variable and an entire array
(array name followed by parentheses). An error will occur if array elements (a
<
subscript > following the array name) are specified.
• Sub-procedures cannot be defined within a sub-procedure.
• A label can be defined within a sub-procedure, but it cannot jump (by a GOTO or GOSUB
statement) to a label outside the sub-procedure.
• Local variables cannot be used with PRINT and SEND statements.
SAMPLE 1
A=1
CALL *TEST
PRINT A
HALT
’SUB ROUTINE: TEST
SUB *TEST
A=50 ····················· Handled as a different variable than
the "A" shown above.
END SUB
• In the above example, the program level variable "A" is unrelated to the variable "A" within the
sub-procedure. Therefore, the value indicated in the 3rd line PRINT statement becomes "1".
MEMO
MEMO