Plugging The Bus Connector Into The Module - Siemens SIMATIC C7-626 Installation, Assembly, Wiring

Configuring MPI Networks and PROFIBUS-DP Networks
3.5.4
Connecting the
Bus Connector
3
Removing the Bus
Connector
3-24

Plugging the Bus Connector into the Module

Proceed as follows to connect the bus connector:
1. Plug the bus connector into the module.
2. Screw the bus connector to the module.
3. If the bus connector (order number 6ES7 ...) is at the start or end of a
segment, you must switch on the terminating resistance (switch position
"ON") (see Figure 3-18).
Make sure that the stations with the terminating resistance are always
supplied with power during power up and during operation.
Terminating resistance
switched on
Figure 3-18
You can remove the bus connector with a looped-through bus cable from
the PROFIBUS-DP interface at any time without interrupting data traffic on
the bus.
Warning
!
Possibility of interrupting data traffic on the bus!
A bus segment must always be terminated at both ends by the terminating
resistance. This is not the case if the last slave with bus connector is not
supplied with power. Since the bus connector draws its power from the node,
the terminating resistance is ineffective.
Make sure that the stations at which the terminating resistance is switched on
are always supplied with power.
Terminating resistance
on
not switched on
off
Bus Connectors (6ES7 ...): Terminating Resistance Switched On and
Not Switched On
on
off
C7-626 / C7-626 DP Control Systems
C79000-G7076-C626-01