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德國BECKHOFF倍福IE系列應用于防水,可移動控制領域中。上海勇控自動化提供
運行原理
目前有多種用于提供實時能力的以太網(wǎng)方案: 例如,通過較的協(xié)議層禁止 CSMA/CD 存取過程,并使用時間分片或輪詢技術來取代它。其它方案使用交換機,并采用的時間控制方式分配以太網(wǎng)報文。盡管這些解決方案能夠比較快和準確地將數(shù)據(jù)包傳送到所連接的以太網(wǎng)節(jié)點,但帶寬的利用率卻很低,特別是對于典型的自動化設備,因為即使是對于非常小的數(shù)據(jù)量,也必須要發(fā)送一個完整的以太網(wǎng)幀。而且,重新定向到輸出或驅(qū)動控制器以及讀取輸入數(shù)據(jù)所需的時間主要取決于執(zhí)行方式。通常也需要使用一條子總線,特別是在模塊化 I/O 系統(tǒng)中,這些系統(tǒng)與 Beckhoff K-bus 一樣,通過同步子總線系統(tǒng)加快傳輸速度,盡管如此,這樣的同步還是無法避免通訊總線傳輸?shù)难舆t。
通過采用 EtherCAT 技術,Beckhoff 突破了其它以太網(wǎng)解決方案的這些系統(tǒng)限制: 不必再像從前那樣在每個連接點接收以太網(wǎng)數(shù)據(jù)包,然后進行解碼并復制過程數(shù)據(jù)。當幀通過每一個設備(直達 I/O 端子模塊)時,EtherCAT 從站控制器讀取與該設備相關的數(shù)據(jù)。同樣,輸入數(shù)據(jù)可以飛速插入至數(shù)據(jù)流中。幀被傳遞(僅被延遲幾位)過去的時候,從站會識別出相關命令,并進行相應處理。此過程是在從站控制器中通過硬件實現(xiàn)的,因此與協(xié)議堆棧軟件的 Run-Time 系統(tǒng)或處理器性能無關。網(wǎng)段中的zui后一個 EtherCAT 從站將經(jīng)過充分處理的報文發(fā)回,這樣該報文就作為一種響應報文由*個從站返回到主站。
從以太網(wǎng)的角度看,Ether¬CAT 總線網(wǎng)段是一個可接收和發(fā)送以太網(wǎng)幀的大型以太網(wǎng)設備。但是,該“設備“不包含帶下游微處理器的單個以太網(wǎng)控制器,而只包含大量的 EtherCAT 從站。與其它任何以太網(wǎng)設備一樣,EtherCAT 不需要通過交換機就可以建立通訊,因而產(chǎn)生一個純粹的 EtherCAT 系統(tǒng)。
IE1000 | Fieldbus Box | Extension Box, 8 digital inputs 24 V DC, filter 3.0 ms, 8 mm; I/O connection with connector: 8 mm, 3-pin, snap-on |
IE1001 | Fieldbus Box | Extension Box, 8 digital inputs 24 V DC, filter 3.0 ms, M8; I/O connection with connector: M8, 3-pin, screw-type |
IE1002 | Fieldbus Box | Extension Box, 8 digital inputs 24 V DC, filter 3.0 ms, M12; I/O connection with connector: M12, 5-pin, screw-type |
IE1010 | Fieldbus Box | Extension Box, 8 digital inputs 24 V DC, filter 0.2 ms, 8 mm; I/O connection with connector: 8 mm, 3-pin, snap-on |
IE1011 | Fieldbus Box | Extension Box, 8 digital inputs 24 V DC, filter 0.2 ms, M8; I/O connection with connector: M8, 3-pin, screw-type |
IE1012 | Fieldbus Box | Extension Box, 8 digital inputs 24 V DC, filter 0.2 ms, M12; I/O connection with connector: M12, 5-pin, screw-type |
IE1502 | Fieldbus Box | Extension Box, up/down counter 24 V DC, 100 kHz, M12; I/O connection with connector: M12, 5-pin, screw-type |
IE2000 | Fieldbus Box | Extension Box, 8 digital outputs 24 V DC, IMAX = 0.5 A, 8 mm; I/O connection with connector: 8 mm, 3-pin, snap-on |
IE2001 | Fieldbus Box | Extension Box, 8 digital outputs 24 V DC, IMAX = 0.5 A, M8; I/O connection with connector: M8, 3-pin, screw-type |
IE2002 | Fieldbus Box | Extension Box, 8 digital outputs 24 V DC, IMAX = 0.5 A, M12; I/O connection with connector: M12, 5-pin, screw-type |
IE2020 | Fieldbus Box | Extension Box, 8 digital outputs 24 V DC, IMAX = 2 A (∑ 4 A), 8 mm; I/O connection with connector: 8 mm, 3-pin, snap-on |
IE2021 | Fieldbus Box | Extension Box, 8 digital outputs 24 V DC, IMAX = 2 A (∑ 4 A), M8; I/O connection with connector: M8, 3-pin, screw-type |
IE2022 | Fieldbus Box | Extension Box, 8 digital outputs 24 V DC, IMAX = 2 A (∑ 4 A), M12; I/O connection with connector: M12, 5-pin, screw-type |
IE2040 | Fieldbus Box | Extension Box, 8 digital outputs 24 V DC, IMAX = 2 A (∑ 12 A), 8 mm; I/O connection with connector: 8 mm, 3-pin, snap-on |
IE2041 | Fieldbus Box | Extension Box, 8 digital outputs 24 V DC, IMAX = 2 A (∑ 12 A), M8; I/O connection with connector: M8, 3-pin, screw-type |
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