Siemens Simatic S7 Series User Manual

45
Adding a Limit Switch The application can be further expanded by adding a limit
switch. The limit switch could be used in this application for a
variety of functions. For example, the limit switch could be used
to stop the motor or prevent the motor from being started.
In this example, the limit switch is associated with an access
door to the motor or its associated equipment. The limit switch
is connected to input I0.3 and controls a normally open contact
in the program. If the access door is open, limit switch LS1 is
open and normally open contact I0.3 is also open. This prevents
the motor from starting.
Start (NO)
Stop (NC)
OL
I0.0
I0.1
I0.2
Input
Points
Output
Points
Q0.0
Network 1
CPU Program
I0.0 I0.1 I0.2
Q0.0
Q0.0
Motor
Starter
Motor
Q0.1
Q0.2
Q0.1
Q0.2
Q0.0
Q0.0
Network 2
Network 3
STOP Indicator
RUN Indicator
Motor is
Stopped
LS1
I0.3
I0.3
A
ccess Door
Open
With I0.3 Contact Open,
Motor will not Start
When the access door is closed, limit switch LS1 is closed and
normally open contact I0.3 is also closed. This allows the motor
to start when the Start pushbutton is pressed.
Start (NO)
Stop (NC)
OL
I0.0
I0.1
I0.2
Input
Points
Output
Points
Q0.0
Network 1
CPU Program
I0.0 I0.1 I0.2
Q0.0
Q0.0
Motor
Starter
Motor
Q0.1
Q0.2
Q0.1
Q0.2
Q0.0
Q0.0
Network 2
Network 3
STOP Indicator
RUN Indicator
Motor is
Stopped
LS1
I0.3
I0.3
A
ccess Door
Closed
With I0.3 Contact Closed,
Motor can be Started
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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.