Common use of PC BASED OPERATOR INTERFACE Clause in Contracts

PC BASED OPERATOR INTERFACE. The operator interface, [I], consists of a PC, color monitor, cursor positioning device, keyboard, and printer. It can be used as the sole operator interface or as a local maintenance work station with all operator control and monitoring coming from communication links with a plant distributed control system (DCS). Operators use the monitor, cursor positioning device, and keyboard. The keyboard is not necessary. However, the keyboard is convenient for accessing displays with dedicated function keys and adjusting setpoints by entering a numeric value such as 100 mw rather than issuing a manual raise/lower command. The keyboard is primarily used for maintenance such as editing application software or alarm messages. Setpoint and logic commands require an initial selection, such as the command to engage the turning gear, which is followed by a confirming execute command. The monitor is available in various sizes and types, and it can be used for desktop mounting, packaged as a drop-in insert for a control room console, or mounted in a separate free-standing cabinet.