|IN||VW, IW, QW, MW, SW, SMW, AC, AIW, LW, T, C, Constant, *VD, *AC, *LD||INT|
|OUT||VW, IW, QW, MW, SW, SMW, LW, AC, T, C, *VD, *AC, *LD||INT|
|Memory Ranges||ENO||Errors||Instruction Support for S7-200 CPUs||SIMATIC/International Mnemonics|
|The Increment Word and Decrement Word instructions add or subtract 1 to or from the input word (IN) and place the result in OUT.
Increment and decrement word operations are signed (16#7FFF > 16#8000).
In LAD and FBD: IN + 1 = OUT
IN - 1 = OUT
In STL: OUT + 1 = OUT
OUT - 1 = OUT
Error Conditions that Set ENO = 0:
SM1.1 (overflow), SM4.3 (run-time), 0006 (indirect address)
These instructions affect the following Special Memory bits:
SM1.0 (zero); SM1.1 (overflow); SM1.2 (negative)