Network Components; Terminating Resistors; Connectors - ABB AC 800M Installation Manual

Network Components

Network Components

Terminating Resistors

DeviceNet requires a terminating resistor to be installed at each end of the trunk.
The following are the requirements for resistors:
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Terminating resistors should be connected at both the ends of a trunk line.
Connecting the terminating resistor in the middle of a trunk line leads to improper
resistance and network failure.
Terminating resistors should not be connected at the end of a drop line.

Connectors

All connectors must support five conductors, which consists of a signal pair, power
pair, and a drain wire. For more information on the Open Connector Pinout, refer to
Figure
It is recommended that the connector should be keyed such that a DeviceNet cable
exits the instrument or device without interfering with any indicators, auxiliary
connectors, or other devices that require access in the field. The DeviceNet
receptacle on the device should be mounted such that the key orientation allows the
cable to have no interference with indicators, auxiliary connectors, or other devices
that may require access in the field.
Hard-wired connections such as direct soldering, crimping, screw terminal blocks,
and barrier strips are allowed. These methods must support node removal without
trunk severing requirement.
The following are the minimum requirements for a DeviceNet connector:
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46
121 ohm.
1% Metal Film.
0.25 Watt.
14.
All wiping contacts must be gold plated.
A minimal operating voltage of 25 V.
A nominal contact resistance of less than 1 milliohm and should not exceed
5 milliohm over life.
Section 2 Transmission Media and Components
9ARD000015-600