Rockwell Automation 2711E PanelBuilder 1400e Modbus Communications - Manual (Page 21)

2–3 Planning an Application for Modbus
Publication 2711E-6.12 – August 1997
Note: The PanelView terminal communicates with local Modbus
stations or with remote, bridged devices if a BM85 module is
connected and configured for the network.
•
Enabled: If a node is enabled, the terminal will communicate
with the device at the node. If the node is not enabled, the
terminal will not communicate with the device. Instead, the
PanelView terminal stores values to be written to the device. This
allows system designers to test their applications without setting
up communications, and to avoid communication errors at the
terminal during testing.
•
Timeout: The number of seconds the PanelView terminal should
wait before reporting a communication error. Three seconds is the
default when a new node is created.
Scanning works the same way for Modbus as it does for Data
Highway Plus. For information about scanning, refer to Chapter 2,
“Planning Applications,” in the PanelBuilder 1400e Configuration
Software for Windows User Manual, publication 2711E-819.
Assigning tags to objects for the Modbus release of PanelBuilder is
similar to assigning tags to objects for DH+. You assign tags with the
Data Source type Device for Modbus applications. Analog, digital,
string, and block tags can all be used in Modbus applications. Where
differences exist between DH+ and Modbus applications, with
respect to assigning tags, they are highlighted in Chapter 6,
“Defining Tags.”
For generic information about assigning tags, see Chapter 2,
“Planning Applications,” in the PanelBuilder 1400e Configuration
Software for Windows User Manual, publication 2711E-819.
Note: You can use the Device Tags Worksheet to record tag
information for each dynamic object in a PanelBuilder application
for Modbus.
Note: For Modbus Device tags, the Tag Database editor supports the
full addressing syntax and range supported by the 5- and 6-digit
addressable devices.
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About Scanning
Recording Tag Information
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