G - Physics – 05 – B
Patent
G - Physics
05
B
G05B 19/02 (2006.01) G06F 13/00 (2006.01)
Patent
CA 2629796
There is provided a process control system comprising a process control device for issuing a requirement command; input-output devices 103 in multiplex configuration, for receiving the requirement command; a switchover function for switching between the master and standby states of the input-output devices, wherein at least one input-output device is mounted in any arbitrary slot 108 of an I/0 device mounting unit 102a, 102b; the input-output devices are provided with arbitrary logic addresses that are the numbers or codes unique to the input-output devices; and the process control device accesses the input- output devices 103 by using the logic addresses, so that the input-output devices in multiplex configuration can be separately mounted in the slots of different I/O device mounting units 109a, 109b. Accordingly, access to the multiplexed input and output devices 103a-3, 103b-3 is made through the use of logic addresses instead of physical addresses, and therefore physical restrictions are eliminated, whereby the degree of freedom in mounting input and output devices is increased.
Bando Akira
Fujita Ryo
Ishikawa Masakazu
Kobayashi Eiji
Kobayashi Masamitsu
Hitachi Ltd.
Hitachi Information & Control Solutions Ltd.
Kirby Eades Gale Baker
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