Device description GF0
MICRO PANEL
Connection to the communication interface
16
Technical subject to change
M000235-01.DOC
© by Micro Innovation
7 C
ONNECTION TO THE COMMUNICATION INTERFACE
7.1 P
REPARING THE CONNECTION CABLE
(EMC)
The preparation of the data and signal cables is an important factor for the electromagnetic
compatibility (EMC) of the Micro Panel GF0, both in terms of interference immunity and emission.
All data cables
on the Micro Panel GF0 (PROG PORT) and on the card in the slot (COM SLOT) must
be
shielded
unless unshielded wiring is specified explicitly. Cables connected to the communications
interface must be laid separately to low-voltage cables when they come together (cable ducts in
separate partitions).
The cable shield must be made from copper braid. Only use a metal or metallised connector casing.
Connect the cable shield directly to the low-impedance connector casing on the GF0. This ensures
that the cable shield is properly connected to the housing of the Micro Panel GF0 via the screws and
the protective metal shroud of the plug connector (low-impedance).
The cables must also be shielded if they are not connected at the other end and are only used, for
example, for commissioning and servicing.
Refer to the operating instructions of the device manufacturers concerned as to how to connect the
shield at the other end. If no specifications are given, connect the cable shield also at this end to the
metal or metallised connector casing.
Avoid leaving the shield open. The data connections to be shielded involve the high-speed transfer of
signals between two active systems. The cable shield only functions against asymmetrical
interference transients if the shield is connected to the device earths (usually metallic device casing)
at both ends.
Provide a potential equalisation conductor with a suitable cross-section between potentials (control
cabinets) if the Micro Panel GF0 and the communications partner are installed in different control
cabinets or at different PE potentials (zero conductor potentials), and if the cable shield at both ends is
directly or indirectly connected to the protective earth conductor. This will prevent the occurrence of
large compensation currents on the shield and shield connections. These kinds of compensation
currents of normally 50 Hz even occur in normal operation and do not represent a problem for data
transmission. However, they may cause the destruction of the shield terminals and contacts,
particularly in the event of short-circuits in the environment.
Special care should be taken with the connection to ensure interference-free
operation.
The EMC values stated in the technical data can only be guaranteed if the cables
are prepared according to the specifications.
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