Electro-
optical
signal
isolator
Electro-
optical
signal
isolator
Power
Supply
SICK
Device
1
2
2
4
3
6
5
System
Controller
=
7
=
8
=
9
Figure 6: Example: Prevention of equipotential bonding currents in the system configuration by
the use of electro-optical signal isolators
1
System controller
2
Electro-optical signal isolator
3
Device
4
Voltage supply
5
Grounding point 2
6
Grounding point 1
7
Metal housing
8
Shielded electrical cable
9
Optical fiber
The use of electro-optical signal isolators between the islands isolates the ground loop.
Within the islands, a stable equipotential bonding prevents equalizing currents on the
cable shields.
Measures for small system installations
For smaller installations with only slight potential differences, insulated mounting of the
device and peripheral devices may be an adequate solution.
Even in the event of large differences in the ground potential, ground loops are effec‐
tively prevented. As a result, equalizing currents can no longer flow via the cable shields
and metal housing.
NOTICE
The voltage supply for the device and the connected peripheral devices must also
guarantee the required level of insulation.
Under certain circumstances, a tangible potential can develop between the insulated
metal housings and the local ground potential.
6.3
Pin assignment
Teach-in via digital output: The first output is complementary to the second output.
UC12-xxxx1, UC12-xxxx5
1
4
3
2
6
ELECTRICAL INSTALLATION
18
O P E R A T I N G I N S T R U C T I O N S | UC12
8010984/1BNB/2022-05-12 | SICK
Subject to change without notice
