Mitsubishi Electric MELSEC-F FX3U-CAN User Manual page 222

FX -CAN User's Manual
3U
2. FROM/TO LED
LED State
OFF
ON
3. Tx/Rx LED
LED State
OFF
ON
4. ERROR LED
LED State
OFF
*1
SINGLE FLASH
*1
DOUBLE FLASH
*1
BLINKING
*1
FLICKERING
ON
*1. ERROR LED has four kinds of flicker states: single flash, double flash, blinking, and flickering. This
LED flickers as follows.
SINGLE FLASH
DOUBLE FLASH
BLINKING
FLICKERING
216
PLC is not accessing BFMs in FX
memory values directly.
PLC is accessing BFMs in FX
memory values directly.
FX -CAN is not transmitting or receiving CAN messages.
3U
FX -CAN is transmitting or receiving CAN messages.
3U
No error
At least one of the error counters of the module has reached or exceeded the error passive level.
Check the following points in the network.
• 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.
A NMT guarding failure (NMT-Slave or NMT-Master) or a heartbeat failure has occurred.
Check the error status in BFM #29.
General error has occurred.
Check the error status in BFM #29.
LSS Services in progress
FX -CAN is in BUS-OFF state, or CPU error occurs in PLC main unit.
3U
The LED will always be ON if there is a BUS_OFF error, a general error (BFM #29, bit 0), or the FROM/TO
watchdog is expired.
• Check the error status in BFM #29.
• Check the ERROR LED of the PLC
• Check the sequence program for FROM/TO watchdog.
0.2 s
0.2 s 0.2 s
0.2 s 0.2 s
0.05 s 0.05 s
Description
-CAN using FROM/TO instructions or other instructions which specify buffer
3U
-CAN using FROM/TO instructions or other instructions which specify buffer
3U
Description
Description
→ For FX
→ For FX
3GC
→ For FX
→ For FX
3UC
→ For FX5U PLC, refer to MELSEC iQ-F FX5U User's Manual (Hardware)
→ For FX5UC PLC, refer to MELSEC iQ-F FX5UC User's Manual (Hardware)
→ For the FROM/TO watchdog, refer to Section 6.9
1 s
0.2 s
14.1 Preliminary Checks
→ Refer to Section 14.2
→ Refer to Section 14.2
→ Refer to Section 14.2
Series PLC, refer to FX
3G 3G
Series PLC, refer to FX
3GC
Series PLC, refer to FX
3U 3U
Series PLC, refer to FX
3UC
1 s
14 Diagnostics
Hardware Edition
Hardware Edition
Hardware Edition
Hardware Edition