12 Diagnostics
12.2 Detail Error Check
95
FX
3U
-J1939 User's Manual
11
Exam
pl
e
Program
12
D
iagnostics
12.2
Detail Error Check
Please check the bit status in Error Status BFM #29.
Note
• The error flags bit 5, bit 6, bit 8 and bit 15 in BFM #29 are latched. Write K0 to BFM #29 to clear all latched
error flags.
All other bits are reset automatically if the cause for the error is resolved.
- When BFM #29 bit 6 is set to OFF, BFM #39 will be reset to K0.
- When BFM #29 bit 15 is set to OFF, all error codes in BFM #401 to #479 will be cleared to H0000.
• In case of a FROM/TO watchdog timer error (bit 7 is ON), the PLC RUN>STOP message will be sent to the
network.
For the PLC RUN>STOP message, refer to Section 5.21 and Chapter 8
Module failures
The module stays in initial status (Displayed in BFM #25). The configuration may be faulty. Reset the
configuration to factory default settings using the BFM #22 bit 1.
For restoring configuration to factory default settings, refer to Section 5.5
For module restart, refer to Section 5.7
Bit
Description
Action
Bit 0
General error
General error has occurred.
This bit is ON if bit 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 12 or 15 are ON. Check the ON bit.
Bit 1
Hardware error
Please contact your local Mitsubishi Electric Representative.
Bit 2
Internal power supply
error
Internal power supply error has occurred.
If this error flag is not cleared after a module reset (BFM #25 bit 0) or another power cycle, FX
3U
-
J1939 is probably damaged. Please contact your local Mitsubishi Electric representative.
For module restart, refer to Section 5.7
Bit 3
CAN controller is in
BUS OFF state
The FX
3U
-J1939 is bus OFF.
The FX
3U
-J1939 has too many transmission errors. Check the following points in the network. And
then, turn on the power for PLC again or restart the FX
3U
-J1939.
For module restart, refer to Section 5.7
•
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_H, CAN_L and CAN_GND are wired correctly.
•
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.
Bit 4
FLASH memory error
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.
For module restart, refer to Section 5.7
Bit 5
Invalid write access to
configuration BFM
while:
*1
•
In online mode
(BFM #25 bit 0 =
ON)
•
Initialization state
(BFM #25 bit 7 =
ON)
•
Save/restore
operation (BFM #22
bit 0, 1 or 2 = ON)
Do not write to configuration BFM when module is online. Write to configuration BFMs, after switching
to configuration mode and off line mode.
For the communication status (BFM #25), refer to Section 5.7
Bit 6
BFM setting error
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.
Refer to Section 5.16
