Siemens Simatic S7 Series System Manual

Program instructions
7.8 Math
S7-200 SMART
System Manual, 09/2015, A5E03822230-AC
267
Input / output
Data type
Operand
IN
BYTE
IB, QB, VB, MB, SMB, SB, LB, AC, *VD, *LD, *AC, Constant
INT IW, QW, VW, MW, SMW, SW, T, C, LW, AC, AIW, *VD, *LD, *AC, Constant
DINT
ID, QD, VD, MD, SMD, SD, LD, AC, HC, *VD, *LD, *AC, Constant
OUT
BYTE
IB, QB, VB, MB, SMB, SB, LB, AC, *VD, *AC, *LD
INT
IW, QW, VW, MW, SMW, SW, T, C, LW, AC,*VD, *LD, *AC
DINT
ID, QD, VD, MD, SMD, SD, LD, AC, *VD, *LD, *AC
Example: Increment and decrement
LAD
STL
Network 1
LD I4.0
INCW AC0
DECD VD100
Increment/decrement operations from the LAD example
IN
OUT
Increment word
125
+
1
=
126
Data address
AC0
AC0
Decrement double word
128000
-
1
=
127999
Data address
VD100
VD100

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.