US 12,455,557 B2
Apparatuses and methods for non-disruptive replacement of simplex I/O components
Sergio Diaz, Pflugerville, TX (US); Gary K. Law, Georgetown, TX (US); and Trevor Duncan Schleiss, Austin, TX (US)
Assigned to FISHER-ROSEMOUNT SYSTEMS, INC., Round Rock, TX (US)
Filed by FISHER-ROSEMOUNT SYSTEMS, INC., Round Rock, TX (US)
Filed on Jun. 10, 2022, as Appl. No. 17/837,264.
Prior Publication US 2023/0400838 A1, Dec. 14, 2023
Int. Cl. G05B 19/418 (2006.01)
CPC G05B 19/41865 (2013.01) [G05B 19/4183 (2013.01); G05B 19/4188 (2013.01)] 22 Claims
OG exemplary drawing
 
1. A simplex Input/Output (I/O) component included in a process control system operating to control an industrial process in a process plant, the simplex I/O component comprising:
a user interface;
a first communication interface communicatively connecting the simplex I/O component to a field device disposed in the process plant; and
a second communication interface communicatively connecting the simplex I/O component to an I/O subsystem, the I/O subsystem communicatively connected to a controller that receives, via the simplex I/O component and the I/O subsystem, data generated by the field device, generates a control signal based on the received data, and sends the control signal to the field device, another field device, or another controller to control the operation of the industrial process; and
the simplex I/O component configured to:
obtain the data generated by the field device via the first communication interface and send the obtained data to the I/O subsystem the second communication interface;
receive, via the user interface of the simplex I/O component, an instruction to enter into a replaceable state of operation, the replaceable state of operation indicative of an imminent physical removal and replacement of the simplex I/O component; and
responsive to the received instruction, enter into the replaceable state and send, via the second communication interface to the I/O subsystem, an indication of the simplex I/O component being in the replaceable state to thereby cause the I/O subsystem to, upon a subsequent failure of the I/O subsystem to receive an expected signal from the simplex I/O component, and based on the indicated replaceable state of the simplex I/O component, store a most recently received data value generated by the field device for sending to the controller.