Siemens Simatic S7 Series

43
Program Operation When the Start pushbutton is pressed, the CPU receives a logic
1 from input I0.0. This causes the I0.0 contact to close. All three
inputs are now a logic 1. The CPU sends a logic 1 to output
Q0.0. The motor starter is energized and the motor starts.
Start (NO)
Stop (NC)
OL
I0.0
I0.1
I0.2
Input
Points
Output
Point
Q0.0
Network 1
CPU Program
I0.0 I0.1 I0.2
Q0.0
Q0.0
Motor
Starter
Motor
Motor
Starts
The output status bit for Q0.0 is now a 1. On the next scan,
when normally open contact Q0.0 is solved, the contact will
close and output Q0.0 will stay on even if the Start pushbutton
is released.
Start (NO)
Stop (NC)
OL
I0.0
I0.1
I0.2
Input
Points
Output
Point
Q0.0
Network 1
CPU Program
I0.0 I0.1 I0.2
Q0.0
Q0.0
Motor
Starter
Motor
Motor is
Running
When the Stop pushbutton is pressed, input I0.1 turns off,
the I0.1 contact opens, output coil Q0.0 de-energizes, and the
motor turns off.
Start (NO)
Stop (NC)
OL
I0.0
I0.1
I0.2
Input
Points
Output
Point
Q0.0
Network 1
CPU Program
I0.0
I0.1
I0.2
Q0.0
Q0.0
Motor
Starter
Motor
Motor
Stops
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