Software-Configured Safety Controller Without Physical Adjusters

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Solution Overview

Problem

Safety controllers with physical adjustment elements, such as potentiometers or DIP switches, are expensive, prone to tampering, and malfunction in harsh environments, affecting operational reliability.

Innovation Solution

Permanently program operating parameters in a non-volatile memory, eliminating physical adjustment elements and using a software-based configuration tool to emulate their functions, ensuring tamper resistance and environmental robustness.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If physical adjustment elements (potentiometers or DIP switches) are used to set operating parameters, then the safety controller can be configured for different applications, but the manufacturing cost increases and the device becomes vulnerable to tampering and environmental malfunctions

Engineering Contradiction:

Improveconfiguration flexibilityVSAvoidoperational reliability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent replaces physical adjustment elements (mechanical potentiometers and DIP switches) with a software-based configuration system. Operating parameters are stored in a program memory and loaded into a register memory, eliminating mechanical components entirely. This substitution provides configuration flexibility through software while improving reliability by removing vulnerable mechanical parts that can be tampered with or malfunction in harsh environments.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Adaptability or versatility

If physical adjustment elements are used to set operating parameters, then the safety controller can be adapted to specific requirements, but the manufacturing cost increases

Engineering Contradiction:

Improveparameter adjustabilityVSAvoidmanufacturing cost

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent eliminates mechanical adjustment elements and implements a purely software-based parameter storage and retrieval system. Operating parameters are stored in program memory and automatically loaded into register memory during operation. This approach significantly reduces manufacturing costs by removing expensive mechanical components while maintaining full parameter adjustability through software configuration.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Ease of operation

If physical adjustment elements are used, then the safety controller can be manually configured, but unauthorized changes can impair the safety function

Engineering Contradiction:

Improvemanual configurabilityVSAvoidtamper resistance

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent replaces accessible mechanical adjustment elements with a protected software-based system. Parameters are stored in program memory and loaded into register memory through controlled software operations, making them inaccessible to unauthorized physical manipulation. This maintains operational configurability while significantly improving tamper resistance, as the software system can implement authentication and protection mechanisms that prevent unauthorized changes.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

4Ease of operation

If physical adjustment elements are used, then the safety controller can be set in the field, but dust and adverse environmental conditions cause malfunctions

Engineering Contradiction:

Improvefield adjustabilityVSAvoidenvironmental susceptibility

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The patent eliminates mechanical adjustment elements that are susceptible to environmental factors such as dust, moisture, and contamination. The software-based parameter storage and retrieval system has no moving parts or contacts that can be affected by harsh environments. Configuration can still be performed in the field through software interfaces, but without the environmental vulnerabilities associated with mechanical components.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentEP4679207A1Safety controller and method for producing a safety controller

Publication Date: 2026.01.14 PILZ GMBH & CO KG

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AI summary

The invention relates to a safety controller (1) comprising: - a plurality of safety inputs (30a, 30b, 30c, 30d) for connecting signal transmitters and a plurality of safety outputs (31a, 31b, 31c, 31d) for connecting actuators, - a safe control device (20) configured to execute a control program (210) by means of which input signals of the safety inputs (30a, 30b, 30c, 30d) can be evaluated and control signals for controlling the safety outputs (31a, 31b, 31c, 31d) can be generated, wherein operating parameters of the safety controller (1), which include at least switch-on delays and/or switch-off delays for the actuators connectable to the safety outputs (31a, 31b, 31c, 31d), are adjustable.and wherein the settings of at least some of the adjustable operating parameters of the safety controller (1) are permanently programmed and stored in a non-volatile memory medium (21) of the safe control device (20) in a retrievable manner.