| 摘要 |
PURPOSE:To grasp completely alarm generating state of a slave station by preserving the alarm information until a confirming signal is transmitted from a master station in a system where a master station supervises centralizingly slave stations. CONSTITUTION:Contacts l1-ln are closed in response to the alarm state generated in slave stations, then a microprocessor 104 executes periodically a program to detect alarm through a PIA101. When the alarm is detected, the processor 104 energizes an S relay 108 to transmit it to the master station 102. A confirming signal is returned from the master station 2, and when alarm is generated at the same time in plural slave stations 11-1X, the microprocessor 203 selects only one slave station among them and returns sequentially the confirming signal. The slave station 11 transmits a start signal to the master station 2 and awaits the return of the confirming signal until the confirming signal is received while preserving the alarm information in a RAM105. |
