Thermcraft XST-6-0-36-3V - Manual (Page 166)

Safety Information Installation and Operation Handbook
E-6 2408 and 2404 Controller
Troubleshooting
No Communications:
• Check the wiring carefully, paying particular attention to the continuity of the A and B
connections to the Master. Ensure that the correct terminals have been wired to.
• Access the HA list in configuration level and check that the function (Func) is set to
Prof. If not, the controller is not configured for Profibus.
• Check that the Node Address ( Addr) in the cMS list is correct for the network
configuration in use.
• Ensure that a Profibus Comms Module is installed in slot H of the 2404/8f. It can be
identified by of the legend on the plug-in module casing, and its distinctive shape:
• Ensure that the network is correctly configured and the configuration has been
transmitted correctly to the Profibus master.
• Verify the GSD file in use is correct by loading it into the master GSD Configuration
tool. This will check the format.
• Verify that the maximum line length for the baud rate in use is not exceeded (see table
above). Note that the 2404/8f is restricted to use at a maximum rate of 1.5 Mbaud.
• Ensure that the last device (not necessarily a 2404/8f) in the network segment is
correctly terminated (see wiring diagram).
• Ensure that no devices other than those at the end of a segment have termination
networks fitted.
• If possible, replace faulty device with a duplicate and retest.
Intermittent failure to communicate.
Intermittent flickering of status from
rdy to run.
Diagnostic status changing but no alarms present in the controller.
• Verify wiring, paying particular attention to screening.
• The I/O data length may be too long. Some Profibus DP Master implementations can
accept no more than 32 input and 32 output words per slave device. Verify by reference
to documentation of the Master.
• Verify that the maximum line length for the baud rate in use is not exceeded (see cable
specifications). Note that the 2404/8f is restricted to use at a maximum rate of 1.5
Mbaud.
• Ensure that the last device (not necessarily a 2404/8) in the network segment is correctly
terminated (see wiring diagram).
• Ensure that no devices other than those at the end of a segment have termination
networks fitted.
• Verify operation with a duplicate device if possible.
SUB24/PB PROFIBUS Iss No.
AH026222 U002 DATE