| 摘要 |
PURPOSE:To apply degeneracy operation of an information transmitter without unnecessary data processing and data transmission by separating immediately a faulty part when a slave station detects a fault. CONSTITUTION:If a process input card 12 of a slave station 3 is faulty, the card 12 sends a fault signal to a control electronics circuit CE 11. The CE 11 input a fault input to a processor 5 via a bus 9. The processor 5 uses a fault interruption routine of a program incorporated in a ROM 7 to recognize a group address and a word address for the fault and sets fault information and a degeneracy parameter into an error table and a degeneracy parameter storage table of the corresponding group address and word address. In fetching an input signal, the degeneracy parameter storage table in a RAM 8 is used to check at first the presence of degeneracy in the unit of groups and then to check whether the degeneracy in the unit of cards exists in the corresponding group or not, and when the degeneracy parameter is set, the card is not scanned but the next word is scanned.
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