Siemens Simatic S7 Series System Manual

Program instructions
7.1 Bit logic
S7-200 SMART
158 System Manual, 09/2015, A5E03822230-AC
7.1.7
Coils: output and output immediate instructions
LAD
FBD
STL
Description
= bit
The Output instruction writes the new value for the output bit to the
process image register.
LAD
and
FBD
: When the output instruction is executed, the S7-200
turns the output bit in the process image register ON or OFF. The as-
signed bit is set equal to power flow state.
STL: The value on the top of the stack is copied to the assigned bit.
=I bit
The Output Immediate instruction writes the new value to both the
physical output and the corresponding process image register location
when the instruction is executed.
LAD
and
FBD
: When the output immediate instruction is executed, the
physical output point (bit) is immediately set equal to power flow. The
"I" indicates an immediate reference; the new value is written to both
the physical output point and the corresponding process image register
address. This differs from the non-immediate references, which only
write the new value to the process image register.
STL
: The instruction immediately copies the value on the top of the
stack to the assigned physical output bit and process image address.
Input / output
Data type
Operand
Bit
BOOL
I, Q, V, M, SM, S, T, C, L
Bit (immediate)
BOOL
Q
Input (LAD)
BOOL
Power flow
Input (FBD)
BOOL
I, Q, V, M, SM, S, T, C, L, Logic flow
See also
Bit logic output examples (Page 163)

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.