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The CNC system consists of a motion control subsystem, sequence control (PLC) subsystem, and HMI subsystem. Each subsystem may have a CPU or the CNC system may be implemented by a single CPU. Since the API behavior is largely dependent on the interaction between the processors, the application programmers and the CNC system designer must pay special attention to the behavior of the APIs. The API commands must be for general purpose use. The API system for these commands must be constructed on the assumption that it is installed on such a controller configuration. For the software-controlled CNC type and the existing or board type CNC + PC type, the API is formulated by a policy such as in the following table. For functions in which the acquisition and setting operations can be executed by a single processing, the operations are given the names Get and Set. On the other hand, for functions that deal with a large amount of data and require multiple acquisition and setting operations, the operations are given the names Read and Write. Open and close processings are required for such API sets. They are classified by file type in the API organization table. A pointer indicating the buffer which contains the PAPISTR structure representing the controller node name. The controller node name to be assigned to the handle should be specified using characters (including the terminal indicator) not exceeding PAPI_MAX_NODE_NAME in number.
Tags : application programming interface, application programmers, cnc system, api commands, max node, controller configuration, control subsystem, sequence control, api system, control plc, motion control, apis, general purpose, assumption, pointer
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