RELIANCE WR-D4005工控控制卡件
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中文資料：
RELIANCE WR-D4005可以包括最多七個串行擴展和/或遠程背板的組合。擴展背板可以是前面列出的任何RX3i或RELIANCE WR-D4005型號。遠程背板可以是《RELIANCE WR-D4005輸入/輸出模塊規(guī)格手冊》（GEK-0898）中列出的任何RELIANCEWR-D4005.遠程背板。? 如果系統(tǒng)僅包括擴展背板，則從CPU到最后一個背板的總距離不能超過15米（50英尺）? 如果系統(tǒng)包括任何遠程背板，則從CPU到最后一個背板的總距離不能超過213米（700英尺）。
遠程背板在更遠的距離上提供與擴展背板相同的功能。遠程背板具有額外的隔離電路，可以減少不平衡接地條件的影響，當背板彼此相距很遠且不共享同一接地系統(tǒng)時，可能會出現(xiàn)這種情況
CPU和遠程背板之間的通信可能比CPU和擴展背板之間的通訊花費的時間稍長。與總的CPU掃描時間相比，這種延遲通常很小。
英文資料：
The RELIANCE WR-D4005 can include a combination of up to seven Serial Expansion and/or Remote Backplanes. The Expansion Backplanes can be any of the RX3i or RELIANCE WR-D4005 models listed earlier. The Remote Backplanes can be any of the RELIANCE WR-D4005 Remote Backplanes listed in the RELIANCE WR-D4005 I/O Module Specifications Manual, GEK-0898. ? If the system includes only Expansion Backplanes, the total distance from the CPU to the last backplane cannot be more than 15 meters (50 feet) ? If the system includes any Remote Backplanes, the total distance from the CPU to the last backplane cannot be more than 213 meters (700 feet).
Remote Backplanes provide the same functionality as Expansion Backplanes over a much greater distance. Remote Backplanes have extra isolation circuitry that lessens the effect of unbalanced ground conditions that can occur when backplanes are located long distances from each other and do not share the same ground system
Communications between the CPU and a Remote Backplane may take slightly longer than communications between the CPU and an Expansion Backplane. This delay is usually small compared to the total CPU scan time.
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