Hardware reference guide

Modbus Plus NOM
35013379 02 October 2007 309
Connections The following information discusses connecting the NOM25200 on fiber cable,
adding a new mode to the network, and repairing the break in the cable.
Adding a New
Node to the
Network
If a new node is added to an existing network in order to extend the network (at the
end of any configuration), then a new node may be connected first by fiber cable and
then hot-swapped to the backplane to avoid errors to the existing network.
If a new mode is added to the middle of the network, the fiber optic cables need to
be disconnected from one side of the existing NOM252 module and connected to
port 1 or 2 of a new node. Additional fiber optic cable then needs to be connected to
the second port of the new NOM252 and to the next NOM252 in the network, the
new NOM252 then has to be hot-swapped to the backplane.
Note: When a new network is assembled, it is recommended that you connect all
cables before powering up the system. Connect fiber optic cables as described
previously in this section.
Hot Swapping Restriction
Modules may be hot swapped when the area is known to be non-hazardous. Do
not hot swap modules in a Class 1, Division 2 environment.
Failure to follow this instruction can result in death, serious injury, or
equipment damage.
WARNING
This document provided by Barr-Thorp Electric Co., Inc. 800-473-9123 www.barr-thorp.com