| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a supervisory controller for a multiplex transmission system in which a trouble, e.g. an abnormal transmission state, occurring on one of the primary or secondary side of multiplex transmission can be prevented from affecting on the other side and the multiplex transmission system can be prevented from malfunctioning entirely. SOLUTION: A transmission data storing section 8 stores transmission data relayed from a primary transmission line 31 to a secondary transmission line 32 and transmission data relayed reversely. Upon occurrence of system down due to an abnormality, a supervisor can reset a main controller 1 and a terminal 2 by removing the transmission data storing section 8 and analyzing the content thereof and can recover the system state immediately before occurrence of the abnormality.</p> |
