Title:
PLANT CONTROL SYSTEM
Document Type and Number:
WIPO Patent Application WO/2007/060959
Kind Code:
A1
Abstract:
A plant control system includes at least one control device and an engineering
device for modifying the security state of the control device. The control device
has a security management unit for receiving a security level modification request
downloaded from the engineering device and modifying the security level of the
control device by referencing a password held by the control device, and a modification
permission unit allowing modification of the security level by the security
management unit.
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Inventors:
OHSAKO SATORU (JP)
Application Number:
PCT/JP2006/323242
Publication Date:
May 31, 2007
Filing Date:
November 21, 2006
Export Citation:
Assignee:
YOKOGAWA ELECTRIC CORP (JP)
OHSAKO SATORU (JP)
OHSAKO SATORU (JP)
International Classes:
G05B23/02; G05B9/02; G06F21/00; G06F21/60; G06F21/62
Foreign References:
| JP2005301935A | 2005-10-27 | |||
| JP2005222464A | 2005-08-18 | |||
| JPH04294401A | 1992-10-19 | |||
| JP2001175301A | 2001-06-29 |
Attorney, Agent or Firm:
NAITO, Teruo et al. (Nishi-shimbashi 1-chome Minato-ku, Tokyo 03, JP)
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