Field device with display
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Abstract
A display for on-site visualization of conditions of an automated process is disclosed. It comprises a display controller which at least temporarily provides a state indication signal representing a constellation of states of at least two process data signals. At least one of the two process data signals is derived from a signal generated externally to the field device. The field device has a display element which responds to a change in the state indication signal with a significant change in its appearance, thus signaling the constellation of the states of the two process data signals in a visually perceptible manner. Therefore, the field device is particularly suited for on-site monitoring of entire plants or sections thereof by operating personnel.
20 Citations
37 Claims
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1-6. -6. (canceled)
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7. A field device installed in a plant implementing an automated process, said field device comprising:
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a display controller which receives at least a first process data signal representing a first process variable from said automated process and a second process data signal representing a second process variable from said automated process, at least said second process data signal being derived from an external signal generated externally to the field device; and
a display element for on-site visualization of process data, said display element being controlled by said display controller based on said first and second process data signals, wherein;
said display controller at least temporarily provides a value indication signal representing an instantaneous value of said second process data signal; and
said display element at least temporarily presents said signal value in a visually perceptible manner. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
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16. A system for monitoring an automated process, said system comprising:
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at least two field devices installed in a plant implementing said automated process, a first one of said field devices generating a first process data signal representing a first process variable and a second one of said field devices generating a second process data signal representing a second process variable, wherein;
the first one of said field devices derives from said first and said second process data signals a state indication signal representing a predefined process condition of said automated process. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 29)
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26. A plant section, comprising:
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a tank having a discharge pipe; and
at least two field devices communicating with each other, a first one of said field devices being installed on said discharge pipe of said tank and generating a first process data signal, which represents an outflow from said tank, and a second one of said field device being mounted above a maximum tank level and generating a second process data signal, which represents a fill level in said tank wherein;
at least one of said two field devices includes a display element of variable appearance; and
said display element is controlled based on said first and second process data signals. - View Dependent Claims (27, 28, 30, 31, 32, 33, 34, 35, 36)
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37. A method for monitoring a tank, the method comprising steps of:
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using a first field device installed on a discharge pipe of said tank for generating a first process data signal representing an outflow from said tank;
using a second field device mounted above a maximum tank level for generating a second process data signal representing a fill level in said tank;
generating from said first and said second process data signals a state indication signal representing a predefined condition of said tank to be monitored; and
using said state indication signal for controlling a display element of at least one of said first and second field devices visually signalling said predefined condition of said tank.
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Specification