Rockwell Automation 2711E PanelBuilder 1400e Modbus Communications - Manual (Page 69)

9–2 Troubleshooting for Modbus Applications
Publication 2711E-6.12 – August 1997
Problem What to do: Cause
Remote station Exception Response—failure in
associated device The controller did not respond because of
an error within the controller. Consult the documentation for the controller
or device being used. Contact the controller
or device manufacturer to determine the
cause of the error.
Remote station Exception
Response—Acknowledge The controller accepted the command, but it
needs some time to complete the
command. Consult the documentation for the controller
or device being used. Increase the node
editor timeout value. Contact the controller
or device manufacturer to determine the
cause of the delay.
Remote station Exception Response—busy, reject
message The controller was too busy to accept the
message. To determine if the controller or device is in
a busy state, consult the documentation for
the controller or device being used. Contact
the controller or device manufacturer to
determine the cause of the problem.
Remote station Exception Response—Negative
Acknowledgement (NAK) The controller was unable to run the
requested program. Consult the documentation for the controller
or device being used. Check for the
availability of the requested function.
Contact the controller or device
manufacturer to determine what functions
the controller or device supports.
Remote station Exception Response—memory
parity error The controller encountered a parity error
while reading its extended memory. Retry the command that caused the error.
Consult the documentation for the controller
or device being used. Contact the controller
or device manufacturer to determine the
cause of the error.
Unable to communicate with remote station The IRQ was incorrectly set on the serial
card. Correct the IRQ.
The same IRQ has been assigned to more
than one device. Correct the IRQ.
The flow control is enabled, and the
Clear-To-Send (CTS) signal is not changing. Specify the correct flow control for Modbus.
You are using a plug and play card, which is
not supported. Use a serial card that is supported. For a list
of supported serial cards, see the
PanelView 1400e Modbus Firmware
Release Note.
The communication drivers required to execute
this application have not been installed. The Modbus firmware driver is not loaded. Use the Serial Firmware Upgrade Utility with
the Modbus driver enhancement kit to
upgrade the terminal’s firmware with the
Modbus driver.
The terminal does not contain the necessary
communication card to execute this application. The serial communications card is not
installed. Install a serial communications card for
Modbus into the PanelView terminal. On the
PanelView terminal, use the Terminal
Information screen to verify that the card is
detected correctly. For more information,
see the PanelView 1000e, 1200e, and
1400e Operator Terminals User Manual.