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Operations at the Time of Communication Error

 

Communication Error

Error Codes

Operation

From controller to communication option

bUS

  • Master drive

    Detects bUS [Option Communication Error] and operates as specified by F6-01 [Communication Error Selection].

  • Slave drive

    Detects CE [Modbus Communication Error] and operates as specified by H5-04 [Communication Error Stop Method].

Note:

  • After error detection, each drive can continue the operation specified by the last received command if the F6-01 and H5-04 settings agree. Because the controller cannot stop the operation, you must supply a stopping method, for example an emergency stop switch.

  • If you set H5-05 = 0 [Comm Fault Detection Selection = Disabled], the drive will not detect CE. The H5-04 setting does not have an effect.

From communication option to master drive

oFAxx

  • Master drive

    Detects oFAxx and coasts to stop.

  • Slave drive

    Detects hLCE [High Level Communication Errors] and coasts to stop.

From master drive to slave drive

CE

The master drive stops communicating with the slave drive in these conditions: Reset the fault to restart communication.

The slave drive detects CE after H5-09 [CE Detection Time] is expired.Then it operates in as specified with H5-04 [Communication Error Stop Method].

  • A message error occurred in the send data from the slave drive 10 consecutive times.

  • Response from the slave drive timed out 10 consecutive times.