| 摘要 |
PURPOSE:To omit data transfer by a processor and to use a valuable common source effectively, by using a communication buffer by a communication controller, a communication I/O control program and an application program in common. CONSTITUTION:Plural control stations 11-1k are dispersedly arranged on respective positions to be controlled, plural supervisory stations 21-2m are arranged on the areas owned by the operators and both the stations 11-1k and 21-2m are connected by a communication line 3 to constitute a dispersion controlling device. Each station 11-1k is provided with a cluster controlling unit 5 and a redundancy unit 6, and process controlling units 41-4n are connected to the respective units 5, 6 through an internal communication line 7. The buffer of a memory in the unit 5 is controlled by a communication I/O controlling program and is used by the communication controller and the application program in common. Consequently, data transfer by the processor is omitted and the variable common source is effectively used. |
