Operation Setting Area For Bus Off Error - Mitsubishi Electric QJ71DN91 User Manual

3 SPECIFICATIONS

3.4.15 Operation Setting Area for Bus Off Error

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This area is used to set whether or not to reset the CAN chip (communication chip) of
the QJ71DN91 to resume the communication if a bus off error occurs.
(1) Operation Setting Area for Bus Off Error (address: 0632
Set whether or not to reset the QJ71DN91's CAN chip (communication chip) to
resume the communication if a bus off error occurs.
Setting "1" in this area enables communication resumption without resetting the
CPU module.
Configure this setting before starting I/O communication (before setting I/O
Communication Request (Y11) to on).
If "1" is set in this area after a bus off error occurs, the CAN chip is not reset.
0: Stop communication without resetting the CAN chip (default)
1: Resume communication by resetting the CAN chip
*: When any value other than 0 and 1 is set, the CAN chip is not reset.
(a) Confirming a bus off error
A bus off error can be confirmed by a LED and relevant values in the buffer
memory.
1) LED
The NS LED on the QJ71DN91 turns on red.
2) Buffer memory
How many times the error occurred is stored in Bus Error Counter
(address: 01B2
(b) After resetting the CAN chip
When the CAN chip is reset, the LED indication and buffer memory values
are changed as follows:
1) LED
When the CAN chip is reset, the NS LED status on the QJ71DN91
changes as follows: turning on (red)
remaining on (green).
2) Buffer memory
Values in Bus Error Counter (address: 01B2
(address: 01B3
) and Bus Off Counter (address: 01B3
H
) are not cleared even if the CAN chip is reset.
H
MELSEC-Q
/1586)
H
).
H
OFF flashing (green)
) and Bus Off Counter
H
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