Maintenance interface device for a use in a process control network
First Claim
1. A portable maintenance interface device for use in a process control system comprising:
- an interface implementing a two-wire, two-way, loop-powered digital communication protocol for connecting to an element in the process control system;
a power detection circuit coupled to the interface for detecting the presence and absence of an operating power in the element; and
a display coupled to the power detection circuit and that displays a status of the operating power based on the presence of the operating power in the element.
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Accused Products
Abstract
A maintenance interface device for use in a digital, loop-powered process control network includes an interface to either a two-wire input/output port of a field device or to a two-wire communication media, a control logic for determining a simple status of the field device or communication loop, and a display for displaying the simple status. The maintenance interface device may be used for fault analysis to detect whether a field device or a communication loop is operational or nonoperational, powered or unpowered, and generating a valid communication signal or generating an invalid communication signal. The maintenance interface device is adapted to perform simple functionality tests on a plurality of devices in a process control network including a loop controller, a digital control system, an operator console, a workstation, a personal computer, and a bridge to thereby detect the functionality of those devices on a communication wire. The maintenance interface device is self-powered, powered from the device under service, or powered from a communication media such as a bus.
211 Citations
23 Claims
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1. A portable maintenance interface device for use in a process control system comprising:
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an interface implementing a two-wire, two-way, loop-powered digital communication protocol for connecting to an element in the process control system;
a power detection circuit coupled to the interface for detecting the presence and absence of an operating power in the element; and
a display coupled to the power detection circuit and that displays a status of the operating power based on the presence of the operating power in the element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
a loop controller, a digital control system, an operator console, a workstation, a personal computer, and a bridge.
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11. A maintenance interface device for use in a process control system comprising:
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an interface implementing a two-wire, two-way, loop-powered digital communication protocol for connecting to an element in the process control system;
a power detection circuit coupled to the interface for detecting the presence and absence of an operating power in the element; and
a display coupled to the power detection circuit and that displays a status of the operating power based on the presence of the operating power in the element, wherein the two-wire, two-way, loop-powered digital communication protocol includes an SP-50 communication protocol. - View Dependent Claims (12, 13)
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14. A portable maintenance interface device comprising:
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an interface implementing a two-wire, two-way, loop-powered digital communication protocol for connecting to an element in a process control system;
a power detection circuit coupled to the interface for detecting the presence and absence of an operating power in the element;
an analog-to-digital converter coupled to the interface for connecting to the element in the process control system and acquiring a digital communication signal;
a controller coupled to the power detection circuit and coupled to the analog-to-digital converter including;
a first control logic that analyzes the operating power of the element; and
a second control logic that analyzes the digital communication signal to detect the presence and absence of a digital communication signal in the element; and
a display coupled to the power detection circuit and coupled to the controller that displays a status of the operating power based on the presence of the operating power in the element and that displays a status of the presence of the digital communication signal in the element. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. A maintenance interface device for use in a process control system comprising:
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an interface implementing a two-wire, two-way, loop-powered digital communication protocol for connecting to an element in the process control system;
a digital communication signal detection circuit coupled to the interface to detect the presence and absence of a digital communication signal in the element; and
a display coupled to the digital communication signal detection circuit that displays a status of the presence of the digital communication signal in the element, wherein the two-wire, two-way, loop-powered digital communication protocol includes an SP-50 communication protocol. - View Dependent Claims (22, 23)
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Specification