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FX2N-32CAN Communication Module
If an WDT error has occurred and FROM/TO traffic is recognized before BFM #26 is reset, the
FROM/TO LED will flicker.
If the WDT is disabled (BFM #26 = 0) and no FROM/TO command from the PLC are received,
the FROM/TO LED will be switched off 200ms after the last FROM/TO command was
processed.
6.1.3
The RUN LED
The RUN LED is controlled by the BUS_OFF and the BUS_OK state of the CAN controller.
When the module experiences too many transmission errors (for example, a baud rate
mismatch), it will go to the BUS_OFF state (CAN error number > 255). In the BUS_OFF state,
the RUN LED is OFF. After an internal software reset and a minimum of 128 bus free signals,
the module changes into BUS_OK state (RUN LED is ON).
6.1.4
The Rx/Tx LED
This LED lights up when the module is exchanging data. If the module is in the Pre-
operational state, the Tx/Rx LED is OFF. In the operational state, the Tx/Rx LED in ON. If an
internal queue overrun occurs, the TxRxLED will start to flicker.
Diagnostics 6.
6-2
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