| 摘要 |
PURPOSE:To immediately input/output status information and manipulated variable information with high urgency even if there are comparatively many status information by allowing I/O controllers to read out the status information of a signal generator at a prescribed period and write the read contents in a process I/O submemory. CONSTITUTION:The controllers 4011-401n read the status information of the signal generator at the prescribed information and writes the read contents in the process I/O submemory 12. Thereby, the status information is always stored in the memory 12 and updated at the prescribed period. When process signal processing processors 301-30m request the status information to the controllers 4011-401n, the controllers 4011-401n read out and transmit the status information stored in the memory 12. Consequently, the status information reading time of the controllers 401-40n can be omitted when the status information is requested and the waiting time from the request up to the reception of the status information to the processors 301-30m can be shortened.
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