Electrical Installation; Wiring Of The Profibus - Lenze E94AYCPM Montageanleitung

6

Electrical installation

Wiring of the PROFIBUS

6 Electrical installation
Wiring of the PROFIBUS
ƒ Wire the PROFIBUS nodes to each other.
Only use cables which correspond to the listed specifications (^ 40).
ƒ Activate the bus terminating resistor in the bus connector at the first and last
physical node.
– PROFIBUS cables with an integrated bus terminating resistor can be freely
purchased from various cable manufacturers.
– The bus terminator is supplied by the node. The external supply of the
communication module feeds the bus terminator independently of the standard
device supply (^ 43).
)
Note!
If you want to disconnect individual bus stations, ensure that the bus
ƒ
terminators at the first and last physical bus station remain active.
The bus terminator is no longer active if ...
ƒ
– the connector has been pulled out e.g. in the event of service;
– the voltage supply of the communication module has been switched
off.
Specification of the transmission cable
)
Note!
Only use cables complying with the listed specifications of the PROFIBUS user
organisation.
Field
Specific resistance
Capacitance per unit length
Loop resistance
Core diameter
Core cross−section
Cores
40
Values
W
135 ... 165 /km, (f = 3 ... 20 MHz)
£
30 nF/km
W
< 110 /km
> 0.64 mm
2
> 0.34 mm
Twisted double, insulated and shielded
l
EDK94AYCPM DE/EN/FR/ES/IT 6.1