| 摘要 |
PURPOSE:To carry out the alteration switching by controlling the plural units of peripheral units via two or more control parts featuring the complementary relation, cutting off the faulty control part and then making other normal control part share the control of the faulty control part. CONSTITUTION:Control parts 1 and 2 are under the control of the higher-rank unit via circuits x and y, and give the control to 10 units of independent peripheral units 3a-3j with the complementary scanning. Such parts 1 and 2 incorporate 10 units of connection channels for peripheral units each. And these channels are divided into two groups of 5 units each via switching part 4 and then connected in switching between 3a-3e and 3f-3j. For contact groups 17-20 plus 17 and 24 of part 4, the connection is usually given between 17 and 24 as well as 19 and 27. But in case part 1 has some fault, the switching is given via relay 23 to secure the connection between contact groups 18 and 24. Thus all peripheral units are controlled at control part 2. And in case part 2 is faulty, part 1 substitutes to give the same control. |
