2-11
2 Nomenclature and Installation
CJ-series PROFIBUS Master Unit Operation Manual for NJ-series CPU Unit (W509)
2-3 Network Installation
2
2-3-3 PROFIBUS Cable Connector
Bus Cable Connector
The plug connector to be used on the CJ-series PROFIBUS Master Unit is a
9-pin male sub-D type, preferably encased in metal and having a facility to
connect the shield of the cable to the case or to pin 1. The cable should be
connected to the receive / transmit lines, pin 3 (B-line) and pin 8 (A-line).
The use of special PROFIBUS DP cable connectors, which are available
from several manufacturers, is highly recommended. Various models are
widely available, with or without the bus termination and inductors built-in. If
provided in the connector, the Bus termination can often be enabled or dis-
abled through a switch on the connector.
The special PROFIBUS DP cable connectors often provide a convenient way
of connecting the cables. The figure on the left, provides an example of such
a bus cable connector.
A standard 9-pin sub-D plug can only be used if the PROFIBUS Master Unit
is not at the start or the end of a bus segment, or on a stub line at a baud rate
of 500 kbps or less.
The two PROFIBUS data lines are designated A and B. There are no regula-
tions on which cable core color should be connected to which of the two data
terminals on each PROFIBUS device; the sole requirement is to ensure that
the same core color is connected to the same terminal (A or B) for all devices
throughout the entire system (across all devices and bus segments). The
PROFIBUS Organization recommends the following rule for data line color
codes: PROFIBUS cables in general will use the colors red and green for the
data lines, with the following assignment:
• Data cable wire A - green
• Data cable wire B - red
This rule applies to both the incoming and the outgoing data lines.
2-3-3 PROFIBUS Cable Connector
To next
station
From
previous
station
To Next Page
Loading...
Need help?
General
