Single-Channel Modular I/O Redundancy for Continuous Process Control
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Solution Overview
Problem
Existing distributed modular I/O systems in industrial automation lack redundancy for single-channel I/O submodules, leading to interruptions in operation when a submodule fails, which is undesirable in applications requiring continuous process control.
Innovation Solution
The implementation of a distributed modular I/O system with redundant single-channel I/O submodules and network switches, allowing for seamless communication and data transfer between controllers and I/O devices, ensuring continuous operation even if one submodule fails, by using redundant adapter modules, power conditioning modules, and Ethernet switches to maintain system integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If redundant I/O submodules and network switches are implemented, then fault tolerance and system availability are improved, but device complexity and cost increase
Solution Approach 1:
The I/O device is divided into multiple independent single-channel I/O submodules (first I/O submodule, second I/O submodule, etc.), each handling a separate communication channel. This segmentation allows individual submodules to be replaced without affecting others, enabling maintenance without system interruption while managing complexity through modular design
Solution Approach 2:
The system configuration is changed to include redundant components (redundant I/O submodule, redundant network switch) that can be activated when primary components fail. This parameter change from single-channel to multi-channel configuration improves reliability while maintaining manageable complexity through standardized modular interfaces
2Duration of action of stationary object
If the system operates with high availability requirements, then continuous process control is ensured, but the system requires more redundant components increasing complexity
Solution Approach 1:
Redundant I/O submodules and network switches are pre-configured and standing by before failure occurs. When a primary submodule fails, the redundant module is already in place and can be activated immediately, ensuring continuous operation without requiring complex real-time reconfiguration
Solution Approach 2:
The redundant I/O submodules are designed with universal interfaces and identical functionality to the primary submodules. Each submodule can perform the same I/O communication functions, allowing any redundant module to replace any failed module regardless of position, simplifying the redundancy management while ensuring continuous operation
Data Source
AI summary
An input/output (I/O) device for a distributed modular I/O system includes a base adapted to be connected to an associated support structure. A terminal block is connected to the base and includes a plurality of wiring connections adapted to be connected to field wiring of an associated controlled system. The I/O device further includes first and second I/O modules each including a plurality of removable single-channel I/O submodules that are each releasably connected to the base and each configured for a select I/O operation for input and output of data relative to the associated controlled system. One or more pairs of the single-channel I/O submodules can be configured to be redundant within or between the first and second I/O modules. Each of the single-channel I/O submodules is operatively connected to wiring connections of the terminal block through the base. The I/O device further includes first and second network switches connected to the base. The first and second network switches are adapted to be respectively connected to first and second backplane circuits. The I/O device further includes first and second system modules connected to the base and each respectively connected to both of the first and second network switches. The first and second system modules are also each respectively operatively connected to all of the removable single-channel I/O submodules of both of the first and second I/O modules such that the first and second system modules control communication of I/O data between the first and second network switches and the single-channel I/O submodules.