Posted 8 Jan 2019 Hi, Can someone provide information about function and interpretation of each flashing or steady LEDs on MLC 1200. For example where to look for when Fault LED flashes during normal operation and so on. Thanks in anticipation that someone will help. Regards Share this post Link to post Share on other sites
Posted 8 Jan 2019 Do you mean an Allen-Bradley MicroLogix 1200 controller ? In general, a flashing red Fault LED indicates a recoverable fault, often created by the user program with a math overflow or array pointer overflow, or by the diagnostic subsystem with an expansion I/O fault. Diagnostic and Troubleshooting information can be found in the MicroLogix 1200 User Manual:https://literature.rockwellautomation.com/idc/groups/literature/documents/um/1762-um001_-en-p.pdf Share this post Link to post Share on other sites
