Foxboro P0903CW combination of 32 LED/switch pairs a 16 section numeric keypad and one NUM LOCK LED

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The Annunciator/Numeric Keyboard (P0903CW) is a combination of 32 LED/switch pairs, a 16 section numeric keypad and one NUM LOCK LED. The keypad section is suitable for entering numeric data into the system. The 32 LED/switch pairs are arranged in an eight column by four row matrix similar to the annunciator keyboard, and also provides for the insertion of eight polyester labels.

The Annunciator Keyboard (P0903CV) is an array of 48 LED/switch pairs arranged in a 12 column by four row matrix. It also contains a horn silence switch and a lamp-test switch. Each LED, under control of the workstation processor's software, may be ON, OFF, or FLASHING as determined by the process conditions. These LEDs, when used in conjunction with the unit's audible annunciator, form an effective means of calling a user's attention to specific areas of the system.

The annunciator keyboard provides a pocket for each column of four switches. The columns accept a polyester label used to print the LED/switch names. Each annunciator switch location has two LEDs; red and yellow. The color for each switch position may be chosen by removing one of the two “knockouts” per switch location from the polyester annotation legend.

The audio alarms feature multiple pitches which indicate audible differentiation of system alarms and process alarm priorities. An external audio output jack is available for an attachable, customer supplied, audio amplifier with speakers. The external speakers provide sufficient capacity to be heard if the keyboard is located in a noisy environment. The keyboards have a lamp test function (LED test) which simultaneously illuminates all the LEDs.

The overlay of the keyboards have a raised embossed circle on each key, and positive tactile/ audible feedback to assure proper switch closure.

The Annunciator Keyboard/Panel and Annunciator/Numeric keyboards are designed for a temperature range and a control room environment where the temperature is controlled and the relative humidity is indirectly controlled.