BECKHOFF BK5200 - Manual (Page 21)

BK5200, BK5210, LC5200 DeviceNet
BK52x0 21
Bus cable
The bus cable consists of two pairs of shielded twisted-pair wires, one for
the data transfer and one for the power supply. The latter can carry
currents of up to 8 amperes. The maximum possible length of a line
depends essentially on the baud rate. If you choose the highest Baud rate
(500 kbaud) you are restricted to lines of at most 100 m. With the lowest
Baud rate (125 kbaud) you will be able to use cable with an overall length
of 500 m.
Node Node Node Node Node Node
Power Tap Signal Conductor
Power Conductor
24 Volt
Power
Supply
The bus cable may consist of a main line with branch lines up to 6m long. It
is important that both ends of the main line should carry 121 Ω terminating
resistors. You can operate up to 64 devices on one line. If you want to be
able to plug and unplug Bus Couplers while the equipment is in operation
you should attach the terminating resistors permanently to the bus cable.
Parameterisation Special DeviceNet configuration software should be used to parameterise
the system. The user places the parameterisation data in the master with
this software. When it is first switched on, the master will compare its
stored settings with the actual configurations of each of the stations. The
exchange of user data between master and slave will not be initiated
unless all the parameters agree. Setting the parameters for the master is
carried out directly via the DeviceNet connection. The DeviceNet system
does not use a separate interface such is provided for other fieldbusses.