Mitsubishi Electric MELSEC-F FX3U-CAN User Manual page 224

FX -CAN User's Manual
3U
Bit No.
Bit 3 CAN bus off error
FLASH memory
Bit 4
error
• CANopen
• Layer 2 mode:
Bit 5
This failure is displayed in BFM #40.
Bit 6 BFM setting error
FROM/TO
Bit 7 watchdog timer
error
Internal data
Bit 8
queue overflow
Bit 9 Reserved
CANopen
Bit 10
NMT Error Control
failure
Baud rate change
Bit 11
error
Node address
Bit 12
change error
CANopen
Bit 13
emergency
CAN error passive
Bit 14
state
Layer 2 Message
Bit 15
specific error
*1. Any CANopen
the action that the node will take is different:
- In error active:
The node will actively mark the frame as invalid.
- In error passive:
The node will not actively mark the frame as invalid to avoid bus disturbance if the node itself has an H/W problem.
218
The FX -CAN is bus OFF.
3U
The FX -CAN has too many transmission errors. Check the following points in the network. And then,
3U
turn on the power for PLC again or restart the FX
• Check that the terminating resistors at both ends of the network are connected.
• Check that all nodes have the same baud rate setting.
• Check that all nodes have a unique Node-Id setting.
• Check that the CAN_H, CAN_L and CAN_GND wires are not broken.
• Check that the CAN_SHLD is grounded.
• Check that the CAN_SHLD is connected at all nodes.
• Check that the CAN cable wires do not short circuit other CAN cable wires.
FLASH memory error has occurred.
Invalid data in the Flash memory might be caused by power loss during a write operation to the Flash
ROM. If this error flag is not cleared after a module reset (BFM #25 bit 0) or another power cycle, please
contact your local Mitsubishi Electric representative.
®
modes: Write access while module is in initialisation mode.
Write to BFMs, after BFM #25 bit 7 is OFF.
Invalid write access to configuration BFM while in online/initialisation mode.
Do not write to configuration BFM when module is online. Write to configuration BFMs, after switching
to configuration mode and off line mode.
BFM setting error has occurred.
ON when a value that is out of range is written to a BFM. This failure BFM address is displayed in BFM
#39. In Layer 2 mode, this bit can not be reset while the module is in online mode.
FROM/TO watchdog timer expired. Please see the above note.
This error flag can be reset by writing to BFM #26.
Internal data queue overflowed.
Extreme bus load can cause the internal queues to overflow. Decrease the bus load.
At a low baud rate, data exchange that is too fast can overflow the CAN Transmit Buffer (Depends also on
the bus-load of the CAN).
® ®
CANopen NMT Error Control failure has occurred.
At least one of the assigned NMT slaves failed during NMT Error Control.
Baud rate change error has occurred.
ON when an invalid baud rate is written to BFM #24. In this case, the BFM will keep its former value.
Node address change error has occurred.
ON when an invalid node address is written to BFM #27. In this case, the BFM will keep its former value.
® ®
CANopen emergency message was received from the assigned slave.
This flag shows the CAN error active state/passive state
OFF: Error active state
CAN reception error counter value is in the range of K0 to K127.
ON: Error passive state
CAN reception error counter value is K128.
This bit will be reset automatically if the internal error counters return back to below K128.
Layer 2 Message specific error exists.
Check the Layer 2 Message specific error code in BFM #401 to #442.
® node will check all CAN messages on the bus for errors. Depending on the error state,
Description
-CAN.
3U
→ For module restart, refer to Section 6.8
→ For module restart, refer to Section 6.8
→ For the communication status (BFM #25), refer to Section 6.8
→ For the communication status (BFM #25), refer to Section 6.8
→ For the FROM/TO watchdog, refer to Section 6.9
→ For Data Exchange Control flag, refer to Section 6.4
→ For NMT Error Control failure, refer to Section 6.24
→ For the baud rate setting, refer to Section 6.7
→ For the node address setting, refer to Section 6.10
→ For the emergency message, refer to Section 6.23
*1
.
→ For the CAN transmission error counter, refer to Section 6.13
→ For the CAN reception error counter, refer to Section 6.14
→ For the Layer 2 Message specific error code, refer to Section 9.2
14 Diagnostics
14.2 Detail Error Check
→ For BFM #39, refer to Section 6.17