Siemens Simatic S7 Series System Manual

Program instructions
7.8 Math
S7-200 SMART
266 System Manual, 09/2015, A5E03822230-AC
Non-fatal errors with ENO = 0
SM bits affected
• 0006H Indirect address
• SM1.1 Overflow
• SM1.0 Result of operation = zero
• SM1.1 Overflow, illegal value generated during the operation, or illegal input
• SM1.2 Negative result
Input / outputs
Data type
Operand
IN
REAL
1
ID, QD, VD, MD, SMD, SD, LD, AC, *VD, *LD, *AC, Constant
OUT
REAL
1
ID, QD, VD, MD, SMD, SD, LD, AC, *VD, *LD, *AC
1
Real (or floating-point) numbers are represented in the format described in the ANSI/IEEE 754-1985 standard (single-
precision). Refer to that standard for more information.
7.8.4
Increment and decrement
LAD / FBD
STL
Description
INC_W
INC_DW
INCB OUT
INCW OUT
INCD OUT
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.
DEC_W
DEC_DW
DECB OUT
DECW OUT
DECD OUT
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.
Non-fatal errors with ENO = 0
SM bits affected
• 0006H Indirect address
• SM1.1 Overflow
• SM1.0 Result of operation = zero
• SM1.1 Overflow, illegal value generated during the operation, or illegal input
• SM1.2 Negative result

Siemens Simatic S7 Series Specifications

General

CPU	Varies by model (e.g., S7-300, S7-400, S7-1200, S7-1500)
Communication Interfaces	PROFIBUS, PROFINET, Ethernet, MPI
Programming	TIA Portal, STEP 7
Programming Languages	LAD, FBD, STL, SCL, GRAPH
I/O Modules	Digital, Analog, Specialty modules available
Operating Temperature	0°C to 60°C (standard models)
Mounting	DIN rail mounting
Operating Voltage	24V DC or 120/230V AC (varies by model)
Protection Class	IP20 (standard models)
Memory	Varies depending on the S7 model. Includes work memory (RAM) for program execution, load memory (EEPROM or Flash) for program storage, and system memory for operating system functions. Memory sizes range from kilobytes to megabytes.