Siemens Simatic S7 Series System Manual

Program instructions
7.1 Bit logic
S7-200 SMART
162 System Manual, 09/2015, A5E03822230-AC
7.1.11
Bit logic input examples
LAD
STL
Normally-open contacts I0.0 AND I0.1 must be ON
(closed) to activate Q0.0. The NOT instruction acts
as an inverter. In RUN mode, Q0.0 and Q0.1 have
opposite logic states.
Network 1
LD I0.0
A I0.1
= Q0.0
NOT
= Q0.1
(Normally-open contact I0.2 must be ON) or (Normal-
ly-closed contact I0.3 must be OFF), to activate
Q0.2. One or more parallel LAD branches (OR logic)
must be true to make the output active.
Network 2
LD I0.2
ON I0.3
= Q0.2
A positive Edge Up input on a P contact or a nega-
tive Edge Down input on an N contact outputs a
pulse with a 1 scan cycle duration. In RUN mode, the
pulsed state changes of Q0.4 and Q0.5 are too fast
to be visible in program status view. The Set and
Reset outputs latch the pulse state into Q0.3 and
make the state change visible in program status
view.
Network 3
LD I0.4
LPS
EU
S Q0.3, 1
= Q0.4
LPP
ED
R Q0.3, 1
= Q0.5
Run-mode timing for input example

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.