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Buffer Memory Details: CANopen€ Mode
3.5.8
CAN transmission error counter (Un\G35)
The ME3CAN1-L stores the current value of the CAN transmit error counter. The displayed value range
is 0 to 256.
The counter counts 8 up if a transmission error is detected. For each transmission without error, the
counter counts 1 down.
Value in Un\G35
NOTE
The warning level is also shown by bit 1 in Un\G25, error passive and Bus OFF are shown in
Un\G29.
3.5.9
CAN reception error counter (Un\G36)
The ME3CAN1-L stores the current value of the CAN reception error counter. The displayed value
range is 0 to 128 and 256.
The counter counts 8 up if a reception error is detected. For each reception without error, the counter
counts 1 down.
Value in Un\G36
NOTE
The warning level is also shown by bit 1 in Un\G25, error passive and Bus OFF are shown in
Un\G29.
3.5.10
Buffer memory setting error display (Un\G39, Un\G40)
Buffer memory setting error display (Un\G39)
Bit 6 of Un\G29 is set to ON if an attempt to write an invalid value into a buffer memory address is
detected. The content of Un\G39 shows the buffer memory address where this failure occurred. In
case of a multiple write error, the first failure will be displayed. The buffer memory will be reset by set-
ting YnF to ON.
Buffer memory initialization / online mode write error display (Un\G40)
If a write access is done while the module is in Layer 2 online mode or in initialization mode, bit 5 of
Un\G29 is set to "1" and Un\G40 indicates the buffer memory address, where this failure has occurred.
In case of a multiple write error, the first failure will be displayed. The buffer memory will be reset by
setting YnF to ON.
MELSEC-L Series – CANopen€ Module ME3CAN1-L
Description
0 to 127
Error active state
96 to 127
Warning level
128 to 255
Error passive state
256
Bus OFF state
Description
0 to 127
Error active state
96 to 127
Warning level
128
Error passive state
256
Bus OFF state
Detailed Description of the Module
Tab. 3-13:
Meaning of the values for the transmission error
counter
Tab. 3-14:
Meaning of the values for the reception error
counter
3 – 19
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