NOTE
Layout of data cables
■
Use screened data cables with twisted-pair wires.
■
Implement the screening design correctly and completely.
■
To avoid interference, e.g. from switching power supplies, motors, clocked drives,
and contactors, always use cables and layouts that are suitable for EMC.
■
Do not lay cables over long distances in parallel with power supply cables and
motor cables in cable channels.
EMC measures
Electromagnetic influences can interfere with signal transmissions and interrupt com‐
munications. To minimize electromagnetic influences, it is necessary to implement the
following measures:
•
Connect the mounting rail to functional earth (FE).
•
Ensure sufficient equipotential bonding of the connection points for the shielding.
Ensure compliance with the applicable standards and directives.
•
Connect all inactive metal parts (doors and housing of the control cabinet, DIN
mounting rails, etc.) to the ground potential.
•
Always connect the cable shielding to the ground connection across a large area
at both ends.
•
Use suitable cable clamps to connect the shielding of the shielded cables to
the ground potential directly at the access to the system (control cabinet, frame,
DIN mounting rail). The cable clamps must reach all the way around the cable
shielding.
•
Use suitable cable clamps to connect the cable shielding to the ground potential,
once again as close as possible to the main module (e.g., on the DIN mounting
rail). The cable clamps must reach all the way around the cable shielding.
•
Keep the cable ends from which the insulation has been stripped as short as
possible.
•
Insulate the end of the shielding braid, for example using a suitable heat-shrinka‐
ble sleeve.
Figure 4: Connecting the cable shielding to the mounting rail, example
1
Mounting rail
2
Cable
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 | SIM1000 FXA, SIM1000 FXG 8023299/1BLK/2021-07-28 | SICK
Subject to change without notice
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