DCS基本分級環節
● 現場控制單元：
指遠離控制中心而在現場附近使用的控制系統，可根據DCS本身機構實現對現場的監控和控制。現場控制單元的使用需要準備不同的設備，如配置插件，即根據系統的要求配置相應的中央處理器插件、電源插件和通信插件等，為后期的分級控制奠定基礎；
冗余配置是分級控制系統中重要的環節之一，在配置的過程中要對主機插件、電源插件和通信插件等實現冗余配置；實現隨現場的分級控制和監測需要對不同的硬件添加DCS，確保分級控制的可靠性。
● 操作站：
操作站中記錄并顯示控制系統中的不同數據，是展示人機交互的場所，常用的操作站中包括系主機控制、顯示設備和鍵盤輸入設備等，是主要使用人工操作記錄和反饋的場所，主要實現顯示不同數據、報警和操作等多種重要功能。
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Allen Bradley Safety Contactor 100-D140 100S-D140D22C
