Wiring Schema for Shared Safety Controller Terminals
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Solution Overview
Problem
Machine safeguarding systems face challenges in efficiently connecting multiple safety devices to a safety controller due to limited terminal availability, leading to increased costs and complexity in wiring and inventory management.
Innovation Solution
A method and apparatus for generating a wiring schema that allows multiple safety devices to share test signals through external terminal blocks, optimizing terminal usage and enabling the connection of more devices to a safety controller, while also providing a cost-effective and expandable safety evaluation device capable of monitoring various safety and non-safety inputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple safety devices are connected to a safety controller with limited terminals, then the number of connected devices is restricted, but increasing terminal availability increases device complexity and cost
Solution Approach 1:
External terminal blocks serve as intermediary components between safety devices and the safety controller. These terminal blocks provide additional connection points, allowing multiple safety devices to be connected without requiring proportional increases in the controller's terminal count. The terminal blocks act as mediators that expand connectivity while maintaining system modularity and reducing direct wiring complexity to the controller.
2Reliability
If each safety device requires dedicated terminals, then connection reliability is maintained, but terminal consumption increases beyond available terminals
Solution Approach 1:
Multiple safety devices are merged to share common terminals through external terminal blocks. Instead of requiring dedicated terminals for each device, the system combines device connections at the terminal block level, allowing multiple devices to interface with fewer controller terminals. This merging approach maintains connection reliability through proper electrical connectivity while reducing overall terminal consumption.
Solution Approach 2:
External terminal blocks provide universal connection points that can serve multiple safety devices simultaneously. These terminal blocks function as multi-functional interfaces, accommodating various device types (light curtains, emergency stops, safety mats) through standardized connection points, thereby reducing the need for device-specific terminals on the controller.
3Adaptability or versatility
If more terminals are provided on the safety controller, then more safety devices can be connected, but device cost and inventory complexity increase
Solution Approach 1:
The terminal provision function is segmented between the safety controller and external terminal blocks. Rather than integrating all terminals directly into the expensive controller unit, the system divides terminal functionality across separate, lower-cost terminal blocks. This segmentation allows the controller to maintain fewer integrated terminals while achieving expanded connectivity through add-on terminal blocks, reducing overall device cost and inventory complexity.
Data Source
AI summary
Apparatus and associated methods relate to generating a wiring schema with more than one safety device sharing at least one test signal through one or more external terminal blocks when the number of terminals required by safety devices exceeds the number of available terminals of a safety controller. In an illustrative example, the method may include determining a total number of terminals A of safety devices to be connected to a safety evaluation device having a number of terminals B. If A is greater than B, the method may then include generating a wiring schema that one or more external terminal blocks may show indicia of electrical connections between an identified set of safety devices and a shared terminal of the safety evaluation device associated with that set. Various embodiments may advantageously expand a number of devices possible to be connected beyond a number of terminals.