Control Signal Delay Scheme for Short-Cycle Data Acquisition
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Solution Overview
Problem
Existing control systems face challenges in acquiring data from lower-level control devices at a cycle shorter than the input cycle due to communication unit restrictions, despite oversampling configurations.
Innovation Solution
A control system with a delay unit in the second control device that outputs signals delayed by different times and an input unit in the first control device that receives these signals at intervals longer than the shortest delay time, along with a storage unit to store these signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If oversampling configuration is provided in the higher-level control device, then time resolution is improved, but it is not effective due to communication unit restrictions
Solution Approach 1:
A delay unit is introduced as an intermediary component in the lower-level control device that generates multiple delayed versions of the input signal. These delayed signals are then transmitted through the communication unit to the higher-level control device, enabling the higher-level device to obtain multiple samples without requiring the communication unit to operate at higher speeds.
Solution Approach 2:
The delay unit performs preliminary processing by creating multiple delayed signal versions before transmission. This preliminary action allows the higher-level control device to receive and process multiple samples within the same communication cycle, achieving oversampling effectiveness despite communication unit restrictions.
2Productivity
If data is transmitted at a shorter cycle than the input cycle from the communication unit, then data acquisition speed is improved, but data loss or overlap may occur
Solution Approach 1:
The input signal is segmented into multiple delayed versions, each representing a different time point. By transmitting these segmented signal versions through the communication unit at the original input cycle, the higher-level control device can acquire data at a shorter effective cycle without causing data loss or overlap, as each delayed signal is clearly distinguished in time.
3Measurement precision
If multiple delayed signals are transmitted through the communication unit, then effective oversampling is achieved, but signal processing complexity increases
Solution Approach 1:
The delay unit in the lower-level control device performs the complex signal processing task of generating multiple delayed versions automatically. This self-service approach eliminates the need for the higher-level control device to implement complex processing logic, as the delayed signals are already prepared and simply need to be received and stored in sequence.
Data Source
AI summary
A control system includes: a first control device; a second control device; and a communication unit configured to input and output a predetermined signal between the first control device and the second control device, in which the second control device includes: a delay unit configured to output a plurality of output signals, each of which is a signal obtained by delaying an input signal by a plurality of different delay times; and an output unit configured to output the plurality of output signals of the delay unit to the communication unit, and the first control device includes: an input unit configured to be input the plurality of output signals from the communication unit at a time interval longer than the shortest delay time; and a storage unit configured to store the plurality of input output signals.