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(c) Program after replacement
In the sequence program after replacement, three programs are required as shown below.
<Before transition>
Main routine
program
END
1) Main routine program
• Replace the PR instruction with the CALL instruction so that a subroutine program is called.
• Output string storage device ("D0" in the program below) cannot be specified directly with the CALL
instruction.
• Use the ADRSET instruction to acquire the indirect address for the CALL instruction.
• Y device ("Y100" in the program before replacement shown in (b)) cannot be specified directly as output
Y number with the CALL instruction. Specify the output Y number in integer.
• An interrupt program is used to output character codes via the output module. Enable the execution of
interrupt programs using the EI instruction.
App - 31
<After transition>
Main routine
program
FEND
P1
Subroutine
program
RET
I31
IInterrupt
program
IRET
END
Figure App.7 Program execution
Figure App.8 Sample program
Output strings and output string storage address are set.
Initial processing
The strings stored in D0 are output.
An execution of interrupt program is
enabled.
The strings stored in D0 and
later are output from Y100 to
Y108.
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