Rievtech PR-12 Series, User Manual And Programmers Manual

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6.8.8 INC -DW & DEC -DW
Input/output Operand Data type
IN VD, ID, QD, MD, SD, SMD, LD, AC, HC,constant, *VD, *LD, *AC Double integer
OUT VD, ID, QD, MD, SD, SMD, LD, AC, *VD, *LD, *AC Double integer
INC -DW: IN + 1 = OUT Both input and output are 32
bits double integers.
DEC -DW: IN - 1 = OUT Both input and output are 32
bits double integers.
In LAD and FBD
：
IN + 1 = OUT
IN - 1 = OUT
The two instructions operations take with symbols.
(16#7FFFFFFF > 16#80000000).
error conditions:
0006 Indirect address
SM1.1 overflow
Special memory bit:
SM1.0 Zero result
SM1.1 overflow
SM1.2 Negative result
Example: