西门子SIMATICS5纤维光学接口模块使用手册pdf,Thereisasteadyincreaseinthedemandsoftheusersofprogrammablecontrollersformore decentralization,andthishasconsiderablysharpenedtherequirementstobemetbytheinterface modulesandtransmissionlink.Afiberopticsinterfacemodulehasthereforebee