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    Why is the red I/O LED ON on a M241 controller?

    The red I/O LED indicates device errors on the serial line 1 or 2, SD card, cartridge, TM4 bus, TM3 bus.

    Only the fact that serial line 1 or 2 is not connected or the SD card is not present will turn that I/O LED ON but everything else may work correctly.

    To find out exactly why the LED is turned on, you can check the PLC_R structure in a Watch window, specifically PLC_R.i_lwSystemFault_1
    Bit field FFFF FFFF FFFF FFFF hex indicates no detected error. A bit at low level means that an error has been detected:
    - bit 0 = Reserved
    - bit 1 = TM3 detected error
    - bit 2 = Ethernet IF1 detected error
    - bit 3 = Ethernet IF2 detected error
    - bit 4 = Serial 1 in overcurrent detected error
    - bit 5 = Reserved
    - bit 6 = CAN 1 detected error
    - bit 7 = Reserved
    - bit 8 = Reserved
    - bit 9 = TM4 detected error
    - bit 10 = SD Card detected error
    - bit 11 = Firewall detected error

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