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YASKAWA
TOEP C730600 91B Modbus TCP/IP Installation Manual
63
Network Monitor
Description
Late Collisions
Cumulative number of late collisions.
Deferred Collisions
Cumulative number of deferred collisions.
Excessive Collisions
Cumulative number of excessive collisions.
Frame Too Large
Cumulative number of frames that exceed the maximum frame size.
Note:
Cumulative counters are reset when the power supply is cycled.
9
Troubleshooting
◆
Drive-Side Error Codes
Drive-side error codes appear on the drive keypad.
lists causes of the
errors and possible corrective actions. Refer to the drive Technical Manual for additional
error codes that may appear on the drive keypad.
■
Fault
Both
bUS [Option Communication Error]
and
EF0 [Option Card External Fault]
can
appear as a fault. When a fault occurs, the keypad ALM LED stays lit. When an alarm
occurs, the ALM LED flashes.
If communication stops while the drive is running, use these questions as a guide to help
remove the fault:
•
Did you correctly connect the Modbus TCP/IP
TM
communication line to the option?
•
Is the communication line properly connected to the option? Is it loose?
•
Is the PLC program working? Is the controller/PLC CPU stopped?
•
Did a momentary power loss interrupt communications?
Code
Name
Causes
Possible Solutions
bUS
Option
Communication Error
The drive did not receive a
signal from the controller.
The communications cable
wiring is incorrect.
•
Check for wiring errors.
•
Correct the wiring.
An existing short circuit or
communications disconnection
Check disconnected cables and short
circuits and repair as needed