Function block MCV_Axis

The data of an AXIS_REF structure is updated by the MCV_Axis FB that, as an input/output variable, has an AXIS_REF structure. This FB also performs the following tasks:

Logging an axis onto the MCE via the HLI. This is done by setting the "plc_present_w" flag in the axis-specific HLI area
Logging on the PLC via the HLI that the PLC can command spindle reset, controller enabling, feed enabling and drive ON for a specific axis to the MCE.
During initialization, the HLI's consistency is verified by checking the version identifier and the size of the HLI.
Acceptance of the error messages reported by the MCE for each axis

In every PLC application that uses the functionality of the ISG-MCP PLCopen function blocks, one instance of this FB must be created for each axis used and an AXIS_REF structure must be assigned to it as a VAR_IN_OUT parameter in the form g_array_axis_ref[i].

To ensure this, the ISG-MCP contains the MCV_P1_PLATFORM program (see Section Function block MCV_P1_PLATFORM), which must be instanced in the tasks of a PLC application. This ensures that the working data of one axis is updated in every PLC cycle.

Function block MCV_Axis 1: — Figure 1-4: Provision of AXIS_REF via the "MCV_Axis" FB

Programming example

Declaration in ST:

cam_in_1     : MC_CamIn;

Call in ST:

cam_in_1    (master:=  fb_ax[0].axis_ref,  slave  :=  b_ax[1].axis_ref);