Data transmission system using the same, and numerical control apparatus of distributed numerical control system

摘要

PURPOSE: To transmit the data to a specific secondary station at a speed higher than a simultaneous broadcast transmission period by starting a speed commander unit through a CPU part based on the data stored in a buffer register when a common frame is sent from an axis group management unit and a timer interruption signal is outputted. ;CONSTITUTION: An axis group management unit 110, i.e., a primary station carries out twice the continuous and successive transmission of data to the secondary stations after transmission of FF, i.e., the simultaneous broadcast and then transmits the data to a specific secondary station. When the primary station transmits the FF, each secondary station produces an interruption. Thus a CPU 131₂ fetches the data written in a buffer register 131₅ by the interruption of each secondary station and also outputs a start signal S1 to a timer circuit 131₆. The circuit 131₆ sends a timer interruption signal S2 back to the part 131₂ after 1ms. Receiving the signal S2, the part 131₂ fetches the data from the register 131₆ by the FF like an interruption.;COPYRIGHT: (C)1996,JPO