Increment And Decrement - Siemens SIMATIC S7 System Manual

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Increment and decrement

Non-fatal errors with ENO = 0

0006H Indirect address

SM1.1 Overflow

Input / output

S7-200 SMART

System Manual, V2.3, 07/2017, A5E03822230-AF

The increment instructions add 1 to the input value IN and place the result into the

location at OUT.

LAD and FBD: IN + 1 = OUT

STL: OUT + 1 = OUT

Increment byte (INC_B) operations are unsigned. Increment word (INC_W) operations

are signed. Increment double word (INC_DW) operations are signed.

The decrement instructions subtract 1 from the input value IN and place the result into

the location at OUT.

LAD and FBD: IN - 1 = OUT

STL: OUT - 1= OUT

Decrement byte (DEC_B) operations are unsigned. Decrement Word (DEC_W) opera-

tions are signed. Decrement double Word (DEC_D) operations are signed.

SM bits affected

SM1.0 Result of operation = zero

SM1.1 Overflow, illegal value generated during the operation, or illegal input

SM1.2 Negative result

IB, QB, VB, MB, SMB, SB, LB, AC, *VD, *LD, *AC, Constant

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

ID, QD, VD, MD, SMD, SD, LD, AC, HC, *VD, *LD, *AC, Constant

IB, QB, VB, MB, SMB, SB, LB, AC, *VD, *AC, *LD

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

ID, QD, VD, MD, SMD, SD, LD, AC, *VD, *LD, *AC

Program instructions

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Simatic s7-200 smart