It stops the movement of the axes and the spindle, eliminating all the enable signals and canceling all the analog outputs of the CNC. When detected from the position loop, it opens the position loop and sets the LOPEN mark to ·1·.

If it is in execution, it interrupts the execution of the part program of the CNC of all channels.

Besides this, it activates the external emergency output.

SERCOS communication has been interrupted. It may be caused by an interruption in the connection ring (optical fiber disconnected or broken) or by a wrong configuration.

1. The identifying wheel does not match the sercosid.
2. Parameter P120 (SERSPD) does not match the transmission speed.3. The drive version is incompatible with the CNC.4. There is an error on the SERCOS board.5. Different transmission speed (baudrate) at the drive and at the CNC.

A drive has been turned off and back on due to a power supply failure. When starting up again, it displays the error 4027 ‘The drive has started up again’ An attempt has been made to read or write an non-existent variable or too many variables in a drive through the fast channel.

To check that the connection ring is not interrupted, check that the light goes through the optical fiber. If it is due to a wrong configuration, contact the Service Department.

If the error is due to the fast channel:

 Check that all the variables to be read or written through the fast channel actually exist.

 Save the SERCOS LOG into a file and see which axis causes the error. Set PLC machine parameters "SRD700 and SWR800" of that drive to "0". Reset the CNC and verify that no errors come up. Set the parameters one by one to the desired value until the failure occurs. When locating the parameter, look that variable up in the drive manual to verify that it exists in that version and it may be accessed. If so, the error may come up because it tries read or write too many variables in that drive.