Shibaura CA20-M10, Operating Manual, Page: 306 / 384

18
– 6
CAL
[Function] This command is used to call a subroutine program of a designated step
identified by tag No.
[Explanation]

This command is used to call a subroutine program of a designated
program step identified by tag No.

This instruction requires a RET (return) command after the last step
jumped to. Each subroutine must end with a RET command.
When the return instruction is executed, the program returns to the step
immediately following the CAL (call) step.

Subroutines can be nested up to 10 levels. Nesting is the system in which
another subroutine is called in a subroutine program.

A diagram of the main routine and subroutine relation is shown below.
[Main routine program]
[Key operation]
STEP 1
Press
CAL
4
.
NOP changes to CAL.
Press
ENT
.
STEP 2
Use the numeric keypad to enter the tag No. to
be called. Press
ENT
.
(Input range: 0 to 999.)
NOTE

The tag No. for STEP 2 can be set to "0" as a temporary value. However, if the
command is executed with that value, the "NO TAG FOUND" error will occur.

When using multitasking, a tag No. in another task cannot be called.
[ P R G M ]
0 0 0 1
C A L 0 0 0
[ P R G M ]
0 0 0 1
N O P
Unconditional Call
Start
Process
CAL10
Process
End
TAG10
Process
CAL20
Process
RET
TAG20
Process
RET
1st nesting (call) 2nd nesting (call)
[Subroutine program]