TR-Electronic LP-38 - 5 Installation; Preparation for Start-Up

Installation / Preparation for start-up
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Page 12 of 22 TR - ELA - TI - GB - 0040 - 06 02/13/2017
5 Installation / Preparation for start-up
Up to 64 bus users can communicate with each other in a DeviceNet network with
Baud rates of 125, 250 or 500 kbit/s. The DeviceNet cable provides both signals for
CAN-L and CAN-H data transmission, as well as two lines for the 24 Volt operating
voltage supply of the DeviceNet bus users. The maximum length of the DeviceNet
cable is dependent on the type of cable selected and the Baud rate. Installation takes
place in a bus topology – with or without taps – and terminators at both ends. The
terminators have a resistance value of 120 Ohm.
Bus lines
The bus lines for the DeviceNet™ system are laid down in the DeviceNet
specification. According to this specification, the maximum extent of a DeviceNet™
system is dependent on the Baud rate:
Cable length
125 kbit/s
250 kbit/s
500 kbit/s
Total length with thick cable
500 m
250 m
100 m
Total length with thin cable
100 m
100 m
100 m
Max. drop line length
6 m
6 m
6 m
Max. length of all drop lines
156 m
78 m
39 m
The DeviceNet  -specification and other applicable standards and guidelines
are to be observed to insure safe and stable operation.
In particular, the applicable EMC directive and the shielding and grounding
guidelines must be observed!