一般傳統的線纜設備中的張力控制系統大多為開迴路，生產該線纜時為符合客戶阻抗標準，會刻意降低線纜的張力以致於製作出的線纜偏粗，意即線料用量會過多而導致材料成本偏高，解決的方法為利用閉迴路進行張力控制，可使線纜達到最佳線徑，以節省材料成本；在張力閉迴路設計中，經系統的動態評估後，本研究採用PI ( Proportional-Integral )的控制架構，為方便實驗進行，本研究特別建立一套張力控制的模擬系統，其中PI控制器參數的決定，捨去費時的試誤法(Try and error)改採Ziegler–Nichols (Z-N)參數調整法求得；在實驗設計上，本研究利用三菱的可程式邏輯控制器（Programmable Logic Controller, PLC）內建的PID模組進行張力控制，為了便於收集張力變化的資料，本文利用Visual C#透過三菱公司提供的MX Component軟體套件建立即時資訊收集的功能。實驗結果顯示該張力模擬控制系統透過Z–N調整法所得到的PI參數，在無外部干擾下，可達到精確且快速的張力控制，其誤差範圍可達類比數位轉換器(ADC)解析度± 1個數值(對應本實驗的張力大小約0.0005 N)。

Generally, the tension control systems in traditional cable equipment are mostly open loop. When the cable is produced, in order to meet customer’s impedance requirement, the tension of cable is deliberately reduced so that the diameter of the produced cable is too thick. That means the amount of copper will be consumed too much and the material cost will be high. To overcome the problem, the tension control by closed-loop manner is proposed to make the cable reach the best diameter to save the material cost. After evaluating the dynamic characteristics of the system, the PI (Proportional-Integral) control architecture is adopted in this study. To facilitate the experiment, a tension control system is established, in which the PI controller parameters are determined by Ziegler-Nichols (Z-N) tuning method instead of the time-consuming try and error. In the experimental design, the PID module built in Mitsubishi PLC (programmable logic controller) for tension control is used. To make the collection of tension data easy, Visual C# is used to develop are al-time information capturing platform via MX component software package provided by Mitsubishi. Experimental results show the PI parameters obtained by the Z-N tuning method can achieve precise and fast tension control. Under no external disturbance, its control error can reach the resolution of ADC (analog-to-digital convertor) ± 1 value (corresponding to the tension force of this experiment is about 0.0005 N).