Process control system
AssigneeYokogawa Electric Corporation
InventorsHiroaki Nakajima, Noriko Kase, Kiyotaka Kozakai, Atsushi Terayama
Life of this patent
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Abstract
A process control system includes: a controller; at least one input and output module connected to the controller; and an allowable propagation delay value calculator in the controller, the allowable propagation delay value calculator being configured to calculate, based on the number of input and output modules connected to the controller, an allowable range for propagation delay time between the controller and the input and output module.
Claims10
A process control system for a plant, which is a safety instrumented system that detects an abnormality in an operation of the plant and performs a control to secure safety of the plant, comprising:
- a controller comprising at least one processor executing at least one program;
- at least one input and output module connected to the controller;
- and
- an allowable propagation delay value calculator in the controller, the allowable propagation delay value calculator calculating, based on the number of input and output modules connected to the controller, an allowable range for propagation delay time between the controller and the input and output module,
- wherein the controller is operated at a predetermined control cycle and performs a delay diagnosis based on a value of the allowable range for the propagation delay time and performs a control to secure safety of the plant.
Dependencies are inferred from the claim text.