| 摘要 |
PURPOSE:To shorten a transmission cycle, by checking on the trouble and power supplying state of each subordinate station, detecting the final address of a subordinate station capable for operation, and transmitting information. CONSTITUTION:A master station 1 is connected to subordinate stations 3n-31 through transmission lines 2, and each subordinate station is provided with control units 4 and 4' and input and output units 5 and 5' to control terminal devices 6 and 6'. After outputting a synchronizing signal, the master station 1 checks on trouble and power supplying states of respective subordinate stations 3n-31 to detect the final address of a subordinate station which is ready for operation. Then, the synchronizing signal is outputted again to output a successively detected final address, and data corresponding to it is outputted successively. This data output is performed successively without address specification while the completion of the data transmission is confirmed by counting operation at intervals of unit time of the data transmission and subtracting address. Once the cycle of transmission reaches the prescribed number of times, checking operation is performed again. |
