Access Route Control for Hot-Swappable Field Device I/O
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Solution Overview
Problem
Existing control systems in process control environments require system shutdown for replacing controller hardware, as the combination of control applications and field devices is rigidly configured, limiting flexibility and efficiency in hardware replacement and software updates.
Innovation Solution
A control system with access route controllers that enable communication between control applications and field devices via a network, allowing for flexible input/output operations and seamless migration of control applications between controllers without system interruption, using a unified access method regardless of the control application's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If field devices are directly connected to a controller with a fixed control application, then the system configuration is simple and reliable, but the system must be stopped when replacing controller hardware
Solution Approach 1:
The system is segmented into multiple control apparatuses (first control apparatus and second control apparatus), each capable of independently controlling field devices. This segmentation allows the control function to be distributed, enabling hardware replacement without system shutdown by switching between control apparatuses.
Solution Approach 2:
Multiple control apparatuses are configured with identical control applications and I/O node configurations, making them universally interchangeable. Each control apparatus can perform the same control functions, allowing seamless replacement without affecting system operation or requiring reconfiguration.
2Ease of operation
If control applications are bound to specific controllers, then the control logic is simple and easy to manage, but hardware replacement requires system shutdown and reconfiguration
Solution Approach 1:
The system changes the binding parameter from physical controller identity to logical control apparatus identity. Control applications are configured to access field devices through I/O nodes with standardized parameters, allowing the physical controller to be replaced while maintaining the same logical configuration and avoiding downtime.
3Device complexity
If a single controller handles all control applications, then the system architecture is simple, but the processing and communication loads are concentrated
Solution Approach 1:
The control function is segmented across multiple control apparatuses, distributing the processing and communication loads. Each control apparatus handles a portion of the control applications and field device communications, reducing the burden on individual controllers while maintaining overall system simplicity through standardized interfaces.
Data Source
AI summary
A control system includes at least one field device, a first control apparatus, a second control apparatus, and a network. The first control apparatus has a first field device, included among the one or more field devices, directly connected thereto and includes a first access route controller and a first control application capable of controlling the first field device. The second control apparatus includes a second access route controller and a second control application capable of controlling the first field device. The first access route controller and the second access route controller are configured to work together to control an input/output route from the first control application and the second control application to the first field device.