| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent an entire system from being stopped by a temporary fault by automatically starting only the terminal of abnormality generation from the interruption of power supply without any human intervention by providing a power source turning-on means at the terminal and providing a reset command control means, an initial setting means and a fault processing means at a controller. SOLUTION: When the power source of a terminal controller 2 is turned on, a power-on reset circuit 27 is operated, an internal circuit is reset, various circuits are completely initialized at this time point and next, a start processing PRG 32a is executed by an MPU 31. Then, data in an initial setting data area 29 or the like are read out and data in the specified area of a register or a memory are set to initial values. Further, all the data transmission routes and terminals, where abnormality is generated, are turned into active state and data transmission is started again. Thus, after any communication fault is caused between master and slave, according to a fault recovery processing PRG 22d, only the slave turned into data processing fault is automatically subjected to a reset operation at the time of power on without any human intervention.</p> |
