它正逐步取代传统的继电器控制系统。
It is gradually replacing the traditional relay control system.
介绍了一种用PLC改造继电器控制系统的方法。
The method of transforming the relay control system with PLC was introduced.
电器控制系统主件均采用进口元件，性能优良，可靠性高。
Electric control system master pieces are imported components, good performance, high reliability.
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