SECURE FRONT-END INTERFACE

摘要

A secure front-end interface for a PLC, RTU or similar device is disclosed. A first server is coupled to the PLC via a communications link and is configured to receive status information from the device and transmit the information to a second server via a one-way data link. The second server has a network interface for coupling to a network and receives the information from the first server via the one-way data link and outputs the information via the network interface based upon a user request. The front-end interface may further include a second one-way data link coupled from the second server to the first server to allow user command entry. The secure front-end interface may alternatively consist only of a single server coupled between the device and the network which requires a user to enter a password before obtaining access to the status information.

主权项

1. A front-end interface for a device, comprising:
a first server coupled to a device via a dedicated communications link and having an output, the first server configured to receive information from the device and forward the information on the output; a one-way data link having an input coupled to the output of the first server and an output, the one-way data link configured to allow information to pass from the input to the output and to prevent any signal from passing from the output to the input; a second server having an input coupled to the output of the one-way data link and a network interface for coupling to a network, the second server configured to receive the information from the device forwarded from the first server via the one-way data link, the second server further configured to output the information to a user via the network interface based upon a user request received via the network interface for the information from the device; and wherein the second server is coupled to the first server only via the one-way data link.