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| AM Stereo receiver |
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Control apparatus having remote PLC device and control method for same
| Details |
Inventors: Shidara, Tatsuya; Yamashita, Akihiro;
Assignee: Mitsubishi Denki Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: Gordon; Paul P.
Assistant Examiner:
Attorney, Agent or Firm: Sughrue, Mion, Zinn, Macpeak & Seas, PLLC
In a control apparatus including a main control section and a plurality of remote PLC devices each connected to the main control section, the main control section has a PLC computing unit controlling the entire system and a remote PLC communication control section executing data transaction via a communication line with the plurality of remote PLC devices, and each remote PLC device including a communication control section executing data transaction via a communication line with the main control section, a memory section for storing therein a sequence program transmitted through the communication line and specified to the remote PLC device, a machine input/output I/F section for executing data transaction with external machine controlled by the remote PLC device, and a PLC computing section for executing PLC processing according to a sequence program and based at least on data transmitted from the main control section and data obtained from the machine input/output I/F section. |
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DETAILED DESCRIPTION It is an object of the present invention to provide a control apparatus having a remote PLC device in which data transfer between the main body of a control apparatus and a remote IO unit is not restricted by computing performance of the PLC computing apparatus in the main body of the control apparatus, nor by transferring capability of a communication line, and the control method.
In a control apparatus having a remote PLC device according to the present invention having a main control section and a plurality of remote PLC devices connected via a communication line to this main control section, the main control section comprises a PLC computing unit for managing an entire system comprising this main control section and the plurality of remote PLC devices, and a remote PLC communication control section for executing data transaction through the communication line with the plurality of remote PLC devices; and the remote PLC device comprises a communication control section for executing data transaction via the communication line with the main control section, a memory section for storing therein a sequence program transmitted via the communication line and specified to the system, a machine input/output I/F section for executing data transaction with an external machine controlled by the system, a PLC computing section for executing PLC processing with the sequence program according to at least data transmitted from the main control section and data obtained from the machine input/output I/F section.
The main control section makes each of the remote PLC devices repeatedly execute the PLC processing according to the sequence program specified to the device, and also executes cyclic data transaction with the remote PLC device with a cycle not dependent on operations of a CPU of the main control section.
Data transfer between the main control section and the remote PLC device is executed with a data frame, and this data frame contains at least header information indicating a station number and a transaction state of the remote PLC device and data for the external machine driven by the remote PLC device
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Audio Signal Processing 
