| 摘要 |
A safety node 1 for a hydrocarbon extraction facility control system, the node comprising: a hydraulic input 11; a hydraulic output 12; a directional control valve 10 disposed between the hydraulic input and the hydraulic output; and a functional safety electronics module 4 containing a logic solver 6 in operable communication with the directional control valve; wherein the logic solver is configured to operate the directional control valve to permit hydraulic communication between the hydraulic input and the hydraulic output in response to the presence of a given condition and inhibit hydraulic communication between the hydraulic input and the hydraulic output in response to the absence of a given condition. |
