S800 I/O是一种使用Profibus通信标准的远程I/O.同时也具备直接与ABB传动设备连接的功能，模件参数可以通过总线进行组态，典型参数包括标签名称、信号范围，滤波时间等。模件状态通过一系列指示灯表示，同时也可以通过总线进行远程诊测。模拟量数值表示为信号范围的0~100%，AI/AO模件每4个VO扫描周期刷新一次，RTD/TC模件每10个IO扫描周期刷新一次，数值周期性地在总线上进行传输，传输能力取决于总线及总线主设备，总线接口模件周期性扫描I/O模件，周期值为4~108ms，取决于I/O模件类型及数量。
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