Parker DP-V1, Техническое руководство

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6
AC30 Profibus DP-V1 Option
Terminators
Failure to terminate a network correctly can reduce the noise immunity
of the network and affect performance.
A termination resistor must be fitted at each end of the network to
prevent interference.
If too many resistors are fitted to the network, the resulting reduced
signal levels may cause nodes to miss bits of information. If network
overload becomes excessive, the reduced signal levels may prevent
the nodes from detecting any activity.
Connect terminating resistors to the end drives as shown below. (All
resistors ± 5%, minimum ¼ Watt).
Data line B (3)
Data line A (8)
GND (5)
VP (6)
390 Ω
220
Ω
390 Ω
Terminating resistors
on the bus
Signals at connector
Pin number in parentheses
Repeaters
The maximum number of nodes allowed on a single PROFIBUS DP-
V1 network segment is 32. A repeater can be used to extend the
network length and/or to allow more than 32 nodes to be connected.
Note:
CNTR-P (Pin Number 4) is a TTL level signal that can
be connected to a repeater. Most repeaters
automatically switch between transmitting and receiving
and so do not need this connection.
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