通信總線不是物理“接線直達”到 CPU MPI 接口，也就是 MPI 接口和通信總線是分開的。該總線結構能夠在“大” CPU 中找到。也就是從 CPU315-2 PN/DP 上到並包括 CPU319-3 PN/DP。這種情況，在 CPU 屬性對話框中選擇“診斷/時鐘”標簽，為同步模式設置“As slave”或“As Master” 在 PLC 中。如果 S7-300 配置作為主時鐘，那麼 CPU 時鐘消息通過工業以太網 CP 傳送到工業以太網子網上從時鐘站。
如果 S7-300 配置作為從時鐘，那麼主時鐘時鐘消息通過工業以太網 CP 傳送到 CPU。
在 S7-300 站硬件配置中配置通過工業以太網 CP 轉發時鐘消息。在 S7-300 站硬件配置中，打開工業以太網 CP 屬性對話框並選擇“時鐘同步”標簽。使能“Forward time of day”功能，點擊“OK”關閉該對話框。
6ES7954-8倍德立（廈門）科技有限公司
銷售經理:張衛東 聯係電話：13055237500 座機：0592-6085900 QQ:3454941352
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優勢品牌：
Siemens（西門子）:
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AB（羅克韋爾）:1734/1746/ 1747/ 1756/1762係列， 承接AB羅克韋爾全係列PLC 變頻器、觸摸屏、軟啟動、伺服等業務.
Schneider（施耐德）:PLC控制器、140處理器、輸入輸出模塊、電源模塊、變頻器低壓配件等。
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