Access to cam tables

PLCopen requires provision of a structure with the name CAM_REF, which must be passed on as an input parameter to the PLCopen FB CamTableSelect. If the call is successful, the PLCopen FB CamTableSelect returns a so-called CAM_ID, which is also defined in PLCopen.

As defined by PLCopen, both CAM_REF and CAM_ID are manufacturer specific.

As a result of the integration of data retention for cam tables and the features of the ISG-MCE, in the ISG realization the data types of CAM_REF and CAM_ID are identical. They merely contain an ordinal number to clearly identify a cam table.

For visualization and possibly modification of table contents, there is currently no function under KW software at the PLC end because no pointers are supported in the system.

The "tab_ldr.lis" file is interpreted during start up. It contains the file names of the cam tables to be loaded. All (*.tab) table files, which must also be in the list directory of the ISG-MCE, are interpreted and are loaded into the table memory.

The following figure elucidates this.