RF ADAPTER FOR FIELD DEVICE WITH LOOP CURRENT BYPASS
First Claim
1. A wireless adapter for use in a two-wire process control loop configured to couple to a process field device in an industrial process control system which is coupled to the two-wire process control loop and provide wireless communication to the process field device, comprising:
- first and second loop terminals configured to couple in series with the two-wire process control loop;
wireless communication circuitry coupled to the first and second loop terminals adapted to provide wireless communication to the process field device; and
loop current bypass circuitry electrically connected between the first and second loop terminals configured to provide a loop current path therebetween in response to an open circuit in a current path of the wireless communication circuitry between the first and second loop terminals.
1 Assignment
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Accused Products
Abstract
A wireless adapter for use with a two-wire process control loop is configured to couple to a process field device in an industrial process control system. The wireless adapter is coupled to the two-wire process control loop and provides wireless communication to the process field device. The adapter includes first and second loop terminals configured to couple in series with the two-wire process control loop. Wireless communication circuitry is coupled to the first and second loop terminals and is adapted to provide wireless communication to the process field device. Loop current bypass circuitry is electrically connected between the first and second loop terminals and is configured to provide a loop current path therebetween in response to an open circuit in wireless communication circuitry.
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Citations
22 Claims
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1. A wireless adapter for use in a two-wire process control loop configured to couple to a process field device in an industrial process control system which is coupled to the two-wire process control loop and provide wireless communication to the process field device, comprising:
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first and second loop terminals configured to couple in series with the two-wire process control loop; wireless communication circuitry coupled to the first and second loop terminals adapted to provide wireless communication to the process field device; and loop current bypass circuitry electrically connected between the first and second loop terminals configured to provide a loop current path therebetween in response to an open circuit in a current path of the wireless communication circuitry between the first and second loop terminals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of providing wireless communication to a process field device coupled to a two-wire process control loop using a wireless adapter, comprising:
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coupling first and second loop terminals of the wireless adapter to the two-wire process control loop; providing power to wireless communication circuitry from the two-wire process control loop through the first and second loop terminals; providing wireless communication to the process field device using wireless communication circuitry powered with power received from the two-wire process control loops; electrically bypassing the wireless communication circuitry by providing a current path between the first and second loop terminals in response to an open circuit in a current path through the wireless communication circuitry. - View Dependent Claims (18, 19, 20, 21, 22)
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Specification