Communication status error messages – Rockwell Automation 2711 MODBUS COMMUNICATIONS FOR PANELVIEW TERMINALS User Manual
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Publication 2711-6.9
Modbus Communications for PanelView Terminals 23
Communication Status Error Messages
These errors appear as a banner at the top of an application screen
(error #634 in upper left corner) or as a status display on the terminal
configuration screen.
Note: Since the PanelView is configured as a master device,
communication status is not updated until the PanelView requests
information. If communications are lost, the PanelView displays the
last communication status.
Errors numbered less than 7 are considered minor fault conditions and
will clear automatically when corrected. Errors numbered 7 and above
require that the terminal be reset to clear the error.
Code
Indicates
Recommended Action
1
No connections established. Occurs on power–up
until a device connection is established on the
network.
Establish a connection over Modbus to the
PanelView.
2
Invalid Messages (Parity Error). The Parity received by the
PanelView is invalid.
Check that the parity of both the PanelView
terminal and Modbus device are set the same.
3
Error Reply Messages (Application Error). Error indicates
that the Modbus device does not support a coil or register
address requested by the PanelView terminal.
Verify the coil and register addresses used in
the application.
4
Error Detect Failures (CRC Error). Indicates that the
messages from a Modbus device contain an invalid Cyclic
Redundancy Check.
Verify the address of each Modbus device and
cabling to each device.
5
Loss of Communications (Rx Timeout). Indicates Modbus
device is not responding.
Verify that the Modbus device supports RTU
communications.
6
Modem Failure (CTS Timeout Failure). Indicates that the
modem failed to assert the CTS line within the time
specified on the configuration screen.
Check the cabling and, if necessary, increase
the CTS timeout on the communications
configuration screen.
7-22
Internal Errors
Reset Terminal, Contact Allen–Bradley
technical support if problem reoccurs.