Siemens Simatic S7 Series System Manual

Program instructions
7.14 Shift and rotate
S7-200 SMART
System Manual, 09/2015, A5E03822230-AC
315
7.14
Shift and rotate
7.14.1
Shift and rotate
Shift instructions (only the byte size LAD box is illustrated, the others are similar)
LAD / FBD
STL
Shift type
Description
SLB OUT,
N
SRB OUT,
N
Shift left byte
Shift right byte
The shift instructions shift the bit values of input value IN right or left by
the bit position shift count N and load the result in the memory location
assigned to OUT.
The shift instructions fill empty bit positions with zero as each bit is shift-
ed out. If the shift count N is greater than or equal to the maximum al-
lowed (8 for byte operations, 16 for word operations, and 32 for double
word operations), the value is shifted the maximum number of times for
the operation. If the shift count is greater than 0, the overflow memory bit
SM1.1 is set to the value of the last bit shifted out. The SM1.0 zero
memory bit is set if the result of the shift operation is zero.
Byte operations are unsigned. For word and double word operations, the
sign bit is shifted when you use signed data values.
SHL_W
SHR_W
SLW OUT,
N
SRW OUT,
N
Shift left word
Shift right word
SHL_DW
SHR_DW
SLD OUT,
N
SRD OUT,
N
Shift left double
word
Shift right double
word
Non-fatal errors with ENO=0
SM bits affected
• 0006H Indirect address • SM1.0 Result of operation = zero
• SM1.1 Overflow (last bit shifted out)
Input / out-
put
Data type
Operand
IN
BYTE
IB, QB, VB, MB, SMB, SB, LB, AC, *VD, *LD, *AC, Constant
WORD
IW, QW, VW, MW, SMW, SW, T, C, LW, AC, AIW, *VD, *LD, *AC, Constant
DWORD ID, QD, VD, MD, SMD, SD, LD, AC, HC, *VD, *LD, *AC, Constant
OUT
BYTE
IB, QB, VB, MB, SMB, SB, LB, AC, *VD, *LD, *AC
WORD
IW, QW, VW, MW, SMW, SW, T, C, LW, AC, *VD, *LD, *AC
DWORD
ID, QD, VD, MD, SMD, SD, LD, AC, *VD, *LD, *AC
N
BYTE
IB, QB, VB, MB, SMB, SB, LB, AC, *VD, *LD, *AC, Constant

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.