Digital Controller Ladder Program Execution
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Solution Overview
Problem
Current digital indicating controllers, such as temperature controllers, require extensive labor and time to implement sequence control functions due to the need for external sequencers or PLCs, involving complex programming and wiring, which increases costs and reduces efficiency.
Innovation Solution
A digital indicating controller with a built-in sequence computation function that allows for the execution of ladder programs using input and setup data, enabling faster processing and communication with external apparatuses for parameter tuning and interlock operations, eliminating the need for external circuits and reducing wiring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a temperature controller is combined with a sequencer or PLC to implement sequence control, then sequence control function is achieved, but device complexity and wiring requirements increase
Solution Approach 1:
The patent merges the sequence control function directly into the temperature controller by providing a sequence computation section that executes ladder programs. This integration eliminates the need for external sequencers or PLCs, reducing device complexity while maintaining sequence control capability. The controller can now perform both temperature control and sequence control functions within a single device.
Solution Approach 2:
The temperature controller is designed with multi-functionality by incorporating a sequence computation section that can execute ladder programs in addition to standard temperature control functions. This universal design allows the single device to perform diverse functions including sequence control, alarm monitoring, and interlock operations without requiring additional external equipment.
2Adaptability or versatility
If external sequencers or PLCs are used for sequence control, then sequence control capability is provided, but labor and time for programming and wiring increase
Solution Approach 1:
By integrating the sequence computation section directly into the temperature controller, the patent eliminates the need for separate external devices. This merger removes the time-consuming tasks of wiring external sequencers and programming separate control systems, as all functions are now implemented within the single controller using its built-in ladder program execution capability.
Solution Approach 2:
The temperature controller performs sequence control computations internally using its own sequence computation section and ladder program execution capability. This self-service approach eliminates the need for external computational devices and reduces the time required for system configuration, programming, and implementation.
3Adaptability or versatility
If the program of the temperature controller is modified to implement sequence control, then sequence control function is added, but labor and time for program modification and field evaluation increase
Solution Approach 1:
The patent incorporates a sequence computation section that is pre-configured to execute ladder programs. This preliminary preparation of the computational infrastructure allows sequence control functionality to be activated simply by loading appropriate ladder programs, rather than requiring complex program modifications and extensive field evaluation to implement sequence control capabilities.
Data Source
AI summary
A digital indicating controller outputs data provided by performing control computation of input data and has a communication function with an external apparatus. The digital indicating controller includes a sequence computation section which executes a ladder program with at least any of the input data, the data provided by performing control computation, internal and external setup data, internal and external setup parameters, or data from the external apparatus as condition input and outputs the execution result.