Process device with supervisory overlayer
First Claim
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1. A process device for measuring a process variable of an industrial process, comprising:
- a process variable sensor configured to sense the process variable;
device circuitry coupled to the process variable sensor configured to process an output from the process variable sensor and provide an output related to the sensed process variable;
a databus configured to carry data between at least two components of the process device, the two components contained within the process device;
safety response circuitry contained within the process device and which is separate from the two components, the safety response circuitry comprising;
a device interface to couple to the process device and provide an output related to operation of a component of the process device, wherein the device interface comprises a connection to the databus of the process device which is used to transfer digital data between the at least two components of the device and a microprocessor of the device;
a component monitor to monitor data carried on the databus, and monitor operation of the component of the process device based upon the output from the device interface and responsively identify a safety event of the component indicative of a failure of the component and provide a safety event output; and
a safety response module to respond to the safety event of the component based upon the safety event output in accordance with a safety response; and
wherein the device interface, component monitor and safety response module are isolated from other components of the process device to provide redundancy.
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Abstract
A process device is configured to meet a desired Safety Integrity Level (SIL). A device interface is configured to couple to the process device and provide an output related to operation of a component of the process device. A component monitor monitors operation of the component and identifies a safety event of the component. A safety response module responds to a safety event of the component in accordance with a safety response.
60 Citations
29 Claims
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1. A process device for measuring a process variable of an industrial process, comprising:
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a process variable sensor configured to sense the process variable; device circuitry coupled to the process variable sensor configured to process an output from the process variable sensor and provide an output related to the sensed process variable; a databus configured to carry data between at least two components of the process device, the two components contained within the process device; safety response circuitry contained within the process device and which is separate from the two components, the safety response circuitry comprising; a device interface to couple to the process device and provide an output related to operation of a component of the process device, wherein the device interface comprises a connection to the databus of the process device which is used to transfer digital data between the at least two components of the device and a microprocessor of the device; a component monitor to monitor data carried on the databus, and monitor operation of the component of the process device based upon the output from the device interface and responsively identify a safety event of the component indicative of a failure of the component and provide a safety event output; and a safety response module to respond to the safety event of the component based upon the safety event output in accordance with a safety response; and wherein the device interface, component monitor and safety response module are isolated from other components of the process device to provide redundancy. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification