Commanding via the PLC

The PLC can control the upload start or trigger it itself via the control unit (CU) on the PLC interface (HLI). To do this, the PLC must enable the control unit using the enable_w signal.

HLI syntax for CNC Builds as of V2.11.20xx

The explanations and graphics below are compiled for CNC Builds as of V2.11.28xx.
The behaviour in CNC Builds up to V2.11.20xx is analogous except for the related HLI syntax.

Commanding via the PLC 1:

Starting point – control unit enabled

Every request is forwarded to the HLI. The data item request_r is set to TRUE on the CU. It is then possible to determine in the PLC whether the upload process is started. A start requires setting command_w to TRUE. As soon as state_r reverts to FALSE, the PLC must set command_w to FALSE. This completes writing of the diagnosis data.

Commanding via the PLC 2:
Upload signal profile with control unit enabled

Starting point – control unit disabled

Every request commands the upload process directly, provided no other upload is active. The request command comes either via the NC command or via the CNC object.

Commanding via the PLC 3:
Upload signal profile with control unit disabled