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FX2N-32CAN Communication Module
Diagnostics 6.
6.1.5
The ERROR LED
This LED lights up on a general error.
Check the CAN cable, the connectors, the end of the line terminal resistors, and the status of
the bus management mode. Also check BFM #29 for error bits. After the module enters the
data exchange state, if there are no errors and the module is in the BUS_OK state, the LED is
switched off.
In case of a BUS_OFF error, a general hardware error (BFM #29, bit 0) or if the FROM/TO
watchdog is expired, the LED will always be ON.
The LED will flicker if the FX
-32CAN is in error passive state (CAN error counter >128) or on
2N
an internal queue overflow.
A flickering ERROR LED does not mean there is a permanent error.
After the node changes from error passive to error active state the LED will be switched off.
In case of an transmit or command queue overflow the error is displayed until the
coresponding latched error flags (b8,b9) in BFM #29 are reset and no new queue overflow
occurs.
6-3
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