| 摘要 |
<p>PURPOSE:To provide the duplex loop network system effectively maintaining the communication between normally connected nodes even though a fault occurs in any section of transmission lines. CONSTITUTION:Master node M sending the prescribed control information and slave nodes S1, S2,...S4 receiving and sending the control information are connected in loop shape through 0 system transmission line 1 as a first transmission line. A 1-system transmission line 2 as a second transmission line is also established. Respective slave nodes S1-S4 are provided with a transmission line changeover function switching transmission lines 1 and 2 as needed, reception fault signal output function outputting reception fault signals in inputting no control information, and clock signal output function oscillating based on the reception fault signal and outputting clock signals outside.</p> |
