This page focusses on the what the possible reasons could be when the FX5 PLC does not automatically go into RUN mode – after startup.
For the most part – we will assume that no PLC errors are being detected.
The following Root cause possibilities can be looked at – in a process of elimination:
Additional Troubleshooting Strategy:
If none of the above root cause possibilities are applicable – then the answer might lie within the PLC special status bit. In particular;
After the PLC is turned back to run mode – check the following register values: SM203, SM204, SM206