Safety Controller Architecture With Independent Communication Units
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Solution Overview
Problem
Existing safety control systems face challenges in flexible data communication due to spatial constraints and device layout, making it difficult to dispose a CPU unit with a safety interface unit attached, particularly in manufacturing sites.
Innovation Solution
The safety system employs independent communication units that communicate data according to different periods or events, using various transmission protocols and lines, allowing for flexible and independent data exchange with safety components without affecting each other.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a CPU unit with a safety interface unit attached is disposed at a manufacturing site, then data communication with safety components is achieved, but spatial constraints and device layout make it difficult to implement
Solution Approach 1:
The safety controller is divided into a CPU unit and separate first and second communication units. These communication units can be disposed independently from the CPU unit, allowing flexible spatial arrangement while maintaining reliable data communication with safety components through multiple independent communication paths.
2Adaptability or versatility
If multiple communication units are used for data communication with safety components, then communication flexibility is improved, but system complexity increases
Solution Approach 1:
The communication functionality is segmented into separate first and second communication units, each capable of independent data communication with safety components. This segmentation provides communication flexibility while keeping each unit's internal complexity manageable and independent.
Solution Approach 2:
Both the first and second communication units are designed to perform the same communication function with safety components. This multi-functionality approach allows flexible configuration where either unit can handle communication tasks, reducing the need for specialized complex circuitry in each unit.
Data Source
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AI summary
A safety system includes: a memory; a processor connected to the memory and configured execute a safety program; a first communication unit configured to communicate data with one or more safety components via a first transmission line; and a second communication unit configured to communicate data with one or more safety components via a second transmission line. The second communication unit and the first communication unit independently of each other perform processing involved in communicating data. In the memory, a first data area that holds data communicated by the first communication unit and a second data area that holds data communicated by the second communication unit are arranged independently of each other.