规约 stipulations of an agreement 高级别协议 ul upper level protocol; ulupper level protocol ..
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This article introduces communication theory of optical fiber, model based on optical fiber Ethernet and choose of stipulations of an agreement.
本文介绍了光纤的基本原理、基于光纤以太网的集控站网络模型，以及通讯规约的选择。
The communicate stipulations of an agreement is constituted according as the characteristic of S7-200 PLC. The main procedure flow chat is drawn. The part of debugging result is shown.
结合S7—200系列plc的特点，制定了通信规约，画出了PLC的主程序流程图，并给出了部分调试结果。
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