- Does the Winflash bitrate match the bitrate of the controller? (STW ECU Flashloader default is usually 125k)
- Is the company ID correct?
- Are the proper Comm-DLL and Application hex files configured?
- Is the proper "type of hexfile" selected?
--- For Codesys v2.3 applications use IEC1131 Application
--- For Codesys v2.3 run time systems see the "How do I avoid "Error while flashing" when loading new ESX run-time system hex files?" FAQ.
--- For IOXp use the Automatic setting.
--- For projects in C, use the C Application setting.
- Is controller ignition off (D+) when node search/flash begins, then power on before delay timer expires?
- Is the CAN line terminated (120 ohm, may or may not be necessary)?