
B-63983EN/01 2.PMC SPECIFICATIONS
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2.2.4 Internal Relay (System Area) Addresses (R)
Internal addresses (R) 9000s are an area managed by the system
program.
Operation results of functional instructions
This area holds information necessary for individual ladder levels, such
as the operation results of functional instructions. This information is
saved/restored when the task is switched.
(1) R9000 (operation output register for the ADDB, SUBB, MULB,
DIVB, and COMPB functional instructions)
The result is 0.
The result is negative.
The result has
overflowed.
(2) R9000 (error output for the EXIN, WINDR, and WINDW
functional instructions)
The result is erroneous.
(3) R9002 to R9005 (operation output registers for the DIVB
functional instruction)
The remainder of a division performed with the DIVB functional
instruction is output to these addresses.