Siemens SIMATIC S7-300 - Manual (Page 22)

3 Installing and
wiring the hardware
18
SIMATIC S7-300 Getting Started for First Time Users
Getting Started, 04/2007, 6ZB5310-0NC02-0BA0
3.3 Wiring the components
Wire the system components to the CPU 312C. This enables the CPU 312C to
detect and evaluate the state of the components with the help of the control pro-
gram.
• The momentary-contact switches are signal transmitters. You connect the sig-
nal transmitters to the input terminals of the CPU 312C. The input terminals
are labeled with “DI”.
• The motor is the signal receiver. You connect the signal receiver to the output
terminals of the CPU 312C. The output terminals are labeled with “DO”.
The entire control loop is connected to the power supply via the CPU 312C.
Preparing the cables
1. Cut the cables to the desired
length.
2. Remove the insulation and press
the ferrules onto the ends of the
cable.
Warning
Dangerous electrical voltages!
Death or serious bodily injury
and damage to machinery
and equipment can occur if
you do not observe the follow-
ing safety precautions.
Before starting work, discon-
nect the system and the
device from the power supply.