Siemens SIMATIC NET PROFIBUS User Manual
Passive Components for RS-485 Networks
4-46
PROFIBUS Networks SIMATIC NET
6GK1970-5CA20-0AA1 Release 2 05/2000
4.6
Plugging the Bus Connector into the Module
Fitting the Bus Connector
To fit the bus connector, follow the steps outlined below:
1. Plug the bus connector into the module.
2. Screw the bus connector to the module.
3. If the bus connector is located at the start or end of a segment, you must
activate the terminating resistor (switch setting ON”) (see Figure 4-26).
It is not possible to activate the terminating resistor on the bus connector
6ES7 972-0BA30-0XA0.
6ES7 972-0BA30-0XA0.
Note
Remember the following:
S
By activating the terminating resistor, the outgoing LAN cable is
disconnected from the incoming LAN cable.
disconnected from the incoming LAN cable.
S
Stations equipped with a terminating resistor must always be
supplied with voltage when the network starts up and during
operation.
supplied with voltage when the network starts up and during
operation.
Terminating
resistor activated
resistor activated
Terminating resistor
not activated
not activated
on
off
on
off
Figure 4-26
Bus Connector (6ES7 972-0B.11-...): Terminating Resistor Activated and
deactivated
deactivated
Removing the Bus Connector
If the LAN cable is connected through, you can remove the bus connector from
the PROFIBUS-DP interface at any time without interrupting data traffic on the
bus.
the PROFIBUS-DP interface at any time without interrupting data traffic on the
bus.