PROFIBUS-DP field bus
PCD0
26/766 E2
(HB_PCD0 26 766_E2.DOC)
SAIA-Burgess Controls Ltd.
Page 171
Subminiature connectors
If subminiature connectors are used connectors with a metal casing
must be used. The shield of the bus cable must be connected to the
metal casing. Bus nodes and bus terminators must be wired as
follows:
1
PROFIBUS node, subminiature, 9-pin, male connector
2
Shielded bus cable
3
PROFIBUS terminator, subminiature, 9-pin, male connector
4
Terminating resistors (to be provided at both ends of the transmission
line)
5
Direct-axis inductance of 110nH with baud rates > 1.5Mbaud must be
provided.
The shields of the bus cables must have a broad-surface connection
to the potential balance rail providing adequate conduction at the
cabinet opening. The potential balance rail is connected to ground for
each electronics cabinet and connected to the potential balance rails
of other cabinets.
1
PROFIBUS node
2
Shielded bus cable
3
PROFIBUS terminator
The guidelines given in the Electrical installation chapter are in addition
and for all bus couplers and must be observed.