| 摘要 |
PURPOSE:To obtain a method without transmission delay by transmitting outgoing control information according to the multi-drop system and transmitting incoming supervisory information according to the system relaying a memory in each slave station. CONSTITUTION:Plural slave stations are connected in series with a master station 1 in the one-pair NCDT system. Then the transmission of the outgoing control information is conducted by the multi-drop system and the incoming supervisory information is transmitted with the relaying of the memory 21 in each slave station. In performing the relaying, a cyclic data (CDT) from the low-order slave station is received and written in the memory 21. Then the timing when the reception of a synonim (SYN) of the CDT data is finished is controlled simultaneously to the transmission start timing of the SYN of the CDT data when the CDT data is read from the memory 21 and transmitted to the high- order slave station. |
