TwinCAT ADS Device CAM

The TwinCAT camshaft controller can be described as a virtual field device (automation device). It makes a TwinCAT ADS (Automation Device Specification) interface available for other communication partners (such as other virtual field devices or Windows programs), through which it can be parameterised or queried. The use of ADS standardises the access to the camshaft controller, placing it in the group of available virtual field devices.

The READ and WRITE operations on the camshaft controller interface occur via two indices, as specified through ADS: the index group (32bit) and the index offset (32bit).
The following pages provide a more detailed description of the group and offset indices of the camshaft controller ADS interface.