| 摘要 |
<p>PROBLEM TO BE SOLVED: To previously prevent the generation of an unexpected output to a plant due to the restart of transmission after the substitution of an I/O card. SOLUTION: An I/O information management device having a terminal board 6 for connecting a cable from a field equipment to manage the state of a plant, an information transmission medium 5 connected to the terminal board 6, an I/O device 2 for inputting/outputting information transmitted from the medium 5 and an arithmetic unit 1 for computing information to be transmitted by the medium 5 is provided with an information storage device 3 for temporarily storing the information transmitted by the medium 5 at the time of substituting the medium 5 or stopping the transmission, the information temporarily stored in the device 3 is compared with information outputted from the unit 1 thereafter, and when the contents of both the information coincide with each other, the transmission of the information from the medium 5 to the device 1 through the I/O device 2 is restarted, and when the contents of both the information are different, an alarm is outputted.</p> |
