US 12,323,268 B2
Can-open master redundancy in PLC-based control system
Limin Chen, Cypress, TX (US); and Vikas Rakhunde, Cypress, TX (US)
Assigned to SCHLUMBERGER TECHNOLOGY CORPORATION, Sugar Land, TX (US)
Filed by Schlumberger Technology Corporation, Sugar Land, TX (US)
Filed on Nov. 16, 2023, as Appl. No. 18/510,852.
Application 18/510,852 is a continuation of application No. 18/160,377, filed on Jan. 27, 2023, granted, now 11,824,682.
Prior Publication US 2024/0259230 A1, Aug. 1, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. H04L 12/40 (2006.01)
CPC H04L 12/40013 (2013.01) [H04L 12/40019 (2013.01); H04L 2012/40215 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A method for controlling equipment at a wellsite, the method comprising:
measuring one or more parameters using a sensor,
wherein the sensor is configured to monitor a subsea wellbore, a subsea electronic module (SEM), a blowout preventer (BOP) stack, the equipment, or a combination thereof;
transmitting the one or more parameters from the sensor to a controller area network (CAN) network, wherein the CAN network is configured to connect to a first CAN module and a second CAN module;
transmitting the one or more parameters from the CAN network to the first CAN module, to the second CAN module, or both;
transmitting the one or more parameters from the first CAN module, the second CAN module, or both to a first subsea programmable logic controller (PLC), a second subsea PLC, or both;
transmitting the one or more parameters from the first subsea PLC, the second subsea PLC, or both to a surface PLC; and
transmitting a signal in response to the one or more parameters from the surface PLC to the equipment for controlling the equipment.