Siemens RS-485 Wartungshandbuch Seite 152

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Bus connectors and preassembled cables
6.3 FastConnect D-sub bus connector
PROFIBUS Network Manual
152 System Manual, Edition 04/2009, C79000-G8976-C124-03
Note
The bus cables are connected using the insulation piercing technique (Fast Connect).
The insulation piercing terminals are designed for 10 connection cycles. If you want to reuse
a cable that has already been connected, you will first need to cut off the end.
6.3.6 Inserting the bus connector (D-sub) in the module
Connecting the bus connector
Follow the steps below to connect the bus connector:
Plug the bus connector into the module.
Screw the bus connector tightly onto the module.
If the bus connector is located at the start or the end of a segment, you must connect the
terminating resistor ("ON" switch setting) (refer to the following figure).
It is not possible to activate the terminating resistor on the bus connector
6ES7 972-0BA30-0XA0.
Note
Please note that:
By activating the terminating resistor, the outgoing bus cable is disconnected from the
incoming bus cable.
Stations equipped with a terminating resistor must always be supplied with power
when the network starts up and during operation.
Terminating resistor
activated
Terminating resistor
NOT activated
on
off
on
off
Figure 6-10 Bus connector (6ES7 972-0Bx12-...): Terminating resistor on and off
Removing the bus connector
You can unplug a bus connector with a looped-through bus cable at any time from the
PROFIBUS DP interface without interrupting data exchange on the bus.
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