5.4 Connecting The Bus Connector To The Module - Siemens SIMATIC S5 Manual

5.4 Connecting the bus connector to the module

Connecting the The procedure for connecting the bus connector is as follows:
bus connector
1. Push the bus connector into position on the module adapter.
2. Tighten the screws to secure the connector to the module.
3. If a bus connector with order number 6ES7 ... is at the start or end of a
Make sure that the stations with active terminating resistors are always
energized throughout power-up and operation.
Figure 5-15 Bus connector (6ES7 ... ): positions of switch for terminating resistor in
Disconnecting bus
If the bus cable is in a loop, you can disconnect bus connectors from the
connectors
SINEC L2 DP interface at any time without interrupting traffic on the bus.
Warning
!
Danger of disrupting data traffic on the bus.
Each bus segment must always have a terminating resistor at each end. Note
that this requirement is not satisfied if the last slave with a bus connector is
deenergized. The bus connector receives its power supply through the
station, so the terminating resistor has no effect if the supply is shut off.
Take care to ensure an uninterrupted power supply to the stations in which
the terminating resistors are in circuit.
ET 200 Distributed I/O System
EWA 4NEB 780 6000-02a
Routing cables; connecting and installing bus connectors
segment, you must activate the terminating resistor (set switch to "ON")
(see Fig. 5-15).
If you are using bus connectors with order number 6ES5 ..., you set the
terminating resistor before closing the housing (see Section 5.3.1).
Terminating resistor
on
in circuit
off
circuit or not in circuit
Terminating resistor
on
not in circuit
off
5
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