Rockwell Automation 2711E PanelBuilder 1400e Modbus Communications - Manual (Page 20)

2–2 Planning an Application for Modbus
Publication 2711E-6.12 – August 1997
A node is a Modbus slave device with which your application will be
communicating on a network. For each node, you must identify the
type of addressing the device uses (5- or 6-digit addressing), its
station address, and the timeout value. Each node must be given a
name to be used when defining tags.
Recording Node Information
For each node, fill in:
•
Node Name: A user-defined node name. The name can be up to
40 characters long, and can include letters, numbers, dash ( – ),
and the underscore character ( _ ). You cannot use spaces.
Tip: Use a name that will help you to identify your Modbus
device when you are assigning tags later in your application. For
example, you could name your Modbus devices according to their
locations or the machine or part of the process they will be
controlling or monitoring.
Note: The node name “Unsolicited_Msgs
" is reserved for system
use in DH+ applications and cannot be assigned to a node defined
by the user. It allows the terminal to support unsolicited messages
to and from the controller. You cannot use a node with this name
in Modbus applications.
•
Device: The type of controller or Modbus device. Specify a 5- or
6-digit addressable device.
•
Channel: The Channel number is 1 by default. The application
network type determines this channel. You cannot change this
value.
•
Station: The address that identifies the Modbus device’s location
on the network. Valid station addresses are between 1 and
247 (decimal).
Defining the Nodes
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