Emerson SI-DeviceNet, Руководство пользователя

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SI-DeviceNet User Guide
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Issue Number: 2
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4.2 SI-DeviceNet connections
To connect SI-DeviceNet to the DeviceNet network, make the connections as shown in
the diagram below. The length of the "pigtail" shield connection must be kept as short as
possible.
Figure 4-2 SI-DeviceNet connections
4.3 DeviceNet cable
DeviceNet cable has 2 twisted pairs plus an overall shielding. DeviceNet has a specified
color code, and it is important that this code is maintained. The data wires are white and
blue, and the network power supply wires are red and black.
DeviceNet networks run at high data rates and require cable specifically designed to
carry high frequency signals. Low quality cable will attenuate the signals and may
render the signal unreadable for the other nodes on the network. Cable specifications
and a list of approved manufacturers of cable for use on DeviceNet networks is
available on the Open DeviceNet Vendors Association web site at
www.odva.org .
Cable
1 2 3 4 5
SI-DeviceNet
2125576532
Table 4.2 DeviceNet cable color codes
Terminal Cable Data signal
Description
1 Black 0V 0 V external power supply
2 Blue CAN-L Negative data line
3 Braided Shield Shield Cable shield
4 White CAN-H Positive data line
5 Red +24 V +24 V external power supply
Control Techniques can only guarantee correct and reliable operation of SI-DeviceNet if
all other equipment installed on the DeviceNet network (including the network cable) has
been approved by the ODVA.
NOTE