xLadder user manual-V2.0.0.6

6.8.7 INC - W & DEC - W

Input/output Operand

Data type

IN

VW, IW, QW, MW, SW, SMW, AC, AIW, LW, T, C,constant, *VD, *LD, *AC Integer

OUT

VW, IW, QW, MW, SW, SMW, LW, AC, T, C, *VD, *LD, *AC

Integer

INC - W: IN + 1 = OUT

Both input and output are 16

bits integers.

DEC - W: IN - 1 = OUT

Both input and output are 16

bits integers.

The two instructions operations take with symbols

(16#7FFF > 16#8000).

IN + 1 = OUT

IN - 1 = OUT

error conditions:

0006

Indirect address

SM1.1

overflow

Special memory bit:

SM1.0

Zero result

SM1.1

overflow

SM1.2

Negative result

Example:

139

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