Preferred Arrangement Of The Wires In Cables - Siemens 6ES7 972-4AA02-0XA0 User Manual

User´s Guide Power Rail Booster
5.4.5

Preferred Arrangement of the wires in cables

For optimizing immunity to interference, it is advisable to arrange the wires in the
cables as follows:
•
The wires for the Power Rail signals (A, B) are separated from the wires for
power (L1, L2, L3) by the Function Earth (FE) at one side and the Protective
Earth (PE) on the other.
or
•
The wires for the Power Rail signals (A, B) are separated from the wires for
power (L1, L2, L3) by a shield.
Fig. 16: Preferred arrangement of the wires in cables
Note
To ensure reliable, safe data transmission, the use of
U
mechanically independent double sliding contacts is mandatory.
These sliding contacts must be installed and set so that there is
adequate surface pressure between sliding contacts and contact
rails at all times. The slider's freedom of movement must not be
impaired by cable ties, for example. Too little pressure and poorly
adjusted contact rail junctions result in bounce and thus lead to
interruptions in data transmission.
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6ES7 972-4AA02-0XA0
Version 12/2005
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