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6F3B0250
Basic Hardware and Function
115
6. Programming Information
6.6.5 Subroutines
In the program type ‘Subroutine’, The following number of subroutines can be
programmed.
T1 T1S
Up to 16 subroutines Up to 256 subroutines
The subroutine is not a independent program. It is called from other program types (main
program, sub-program, interrupt program) and from other subroutines (T1S only).
One subroutine is started with the SUBR instruction, and ended by the RET instruction.
It is necessary to assign a subroutine number to the SUBR instruction. The available
subroutine numbers are 0 to 15 for the T1, or 0 to 255 for the T1S.
¾
[ SUBR (000) ]
¾
Subroutine number
The RET instruction has no subroutine number.
The instruction that calls a registered subroutine is the CALL instruction. The CALL
instruction has the subroutine number to be called.
¾
[ CALL N.000 ]
¾
Subroutine number
Main program Subroutine
ú¾
[ SUBR (000) ]
¾¾¾ç
ú¾çú¾
[ CALL N.000 ]
¾¾ç
ú¾¾¾¾¾¾
[ RET ]
¾ç
NOTE
(1) Multiple subroutines can be programmed in a block. However, one
subroutine in one block is recommended.
(2) In case of the T1S, other subroutines can be called from a subroutine
(nesting), up to 3 levels. In the T1, nesting is not allowed.
Execution
flow
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