Rockwell Automation Publication 1769-UM021G-EN-P - October 2015
181
Use I/O Modules with CompactLogix 5370 L1 Controllers
Chapter 7
2.
Click the Connection tab and use the fault description, in the Module
Fault section, to diagnose the issue.
3.
Click OK to close the dialog box and remedy the issue.
Bus Off Detection and Recovery
When the POINTBus backplane experiences a bus off condition, the
CompactLogix 5370 L1 controller indicates this condition via a BUS OFF
minor fault (Type 03, Code 01). When this fault occurs, the connections
between the controller and I/O modules are broken.
Complete these steps to identify the source of the BUS OFF minor fault.
1.
Make sure the number of local expansion modules in the project matches
the number of modules that are physically installed in the system.
2.
Make sure that all mounting bases are locked and I/O modules are securely
installed on mounting bases.
3.
Make sure all 1734 POINT I/O modules are configured to use the
Autobaud rate.
If these steps do not remedy the fault condition, contact Rockwell Automation®
technical support.
IMPORTANT
You cannot change a 1734 POINT I/O module’s Autobaud setting when
the module is installed in a CompactLogix 5370 L1 control system.
If you must return a 1734 POINT I/O module to Autobaud, see the
POINT I/O Digital and Analog Modules and POINTBlock I/O Modules,
publication
