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3.2 CI/CM PROFIBUS modules CI/CM PROFIBUS模板 The AC 900F is designed for operation with different PROFIBUS communication interfaces like the CI 930F, CI 773F and CM 772F that can be connected on the left side of the PM CPU module。 AC 900F 專為具有不同 PROFIBUS 通信的操作而設(shè)計(jì)，像CI 930F、CI 773F和CM 772F這樣可以在左側(cè)連接PM CPU模塊的一側(cè)。
PROFIBUS communication interfaces ensure communication via the PROFIBUSDP Fieldbus. The internal coupler bus connects the CI/CM with the CPU module. This applies to data and power supply. A dual-port RAM is used for data exchange PROFIBUS通訊接口確保通過PROFIBUS DP現(xiàn)場總線進(jìn)行通訊。內(nèi)部耦合器總線將CI/CM和CPU模板連接起來。這適用于數(shù)據(jù)和電源（指的是通過內(nèi)部耦合器）。雙端口RAM適用于數(shù)據(jù)交換。 3.2.1 CI 930F PROFIBUS-DP Master Interface CI 930F PROFIBUS-DP主站接口 The below description applies to CI 930F with ordering numbers 3BDH....R0002 and ....R0005 only. CI 930F provides two on-board PROFIBUS interfaces A/B for increased availability regarding PROFIBUS communication 以下描述僅適用于訂貨編號(hào)為3BDH....R0002和3BDH ....R0005 的CI 930F，CI 930F提供了兩個(gè)板載PROFIBUS接口A/B以提升PROFIBUS通訊可用性。
LEDs for status display LED狀態(tài)顯示燈 Label 標(biāo)簽 PROFIBUS Interface A Profibus通訊接口A PROFIBUS Interface B Profibus通訊接口B Data arriving at CI 930F via the coupler bus are routed in parallel to both A and B connections. The first data coming in over line A or line B with a correct telegram start are routed to the coupler bus. With simultaneity, either line A or line B is selected at random. Testing and selection is always based on the first character. In the case of a telegram start with error on A, the control logic in CI 930F switches to the redundant line B. The same procedure applies vice-versa for line B. 數(shù)據(jù)通過耦合器總線到達(dá) CI 930F ， A 和 B 連接為平行路由。線路A或者線路B是第一批使用正確報(bào)文開頭的數(shù)據(jù)到耦合器總線的路徑。伴隨同步性，選擇線路A還是線路B是隨機(jī)的。測試和選擇始終基于第一個(gè)字符、在報(bào)文開頭出錯(cuò)的情況下，CI930F的控制邏輯會(huì)切換到線路B，同樣的道理，如果B線路出錯(cuò)，會(huì)自動(dòng)切換到A。
LED status displays LED燈狀態(tài)顯示 After having been switched on, the CI 930 PROFIBUS module performs a self-test during power-up. During initialization, with newly configured modules or after a change of the operating mode, all LEDs may light up briefly before reaching the defined status. 上電后，CI 930 PROFIBUS模板執(zhí)行自檢。在初始化過程中，使用新配置的模塊或在操作模式更改后，所有 LED 可能會(huì)在達(dá)到定義狀態(tài)之前短暫亮起。 Line redundancy OFF LED A (line A)
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