| 摘要 |
PROBLEM TO BE SOLVED: To provide a PLC (program controller) system which easily avoids trouble, continues to drive and control a control object device even if the trouble occurs to a PLC, and is low in cost and high in reliability. SOLUTION: The PLC system stores the control object devices (EA1-EA3, EB1-EB3 to EN1-EN3), which are subordinated to the devices of its own and other devices, for each group (A-N), and drives/controls or stops/controls the control object devices (EA1-EA3, EB1-EB2 to EN1-EN3) for each group (A-N). When the trouble occurs to one of the program controllers (PLC-A to PLC-N), other program controllers (PLC-A to PLC-N) drive/control the control object devices subordinated to the above program controller to which the trouble occurs in a preliminarily fixed order. COPYRIGHT: (C)2005,JPO&NCIPI
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