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(gè)串行擴(kuò)展和/或遠(yuǎn)程背板的組合。擴(kuò)展背板可以是前面列出的任何RX3i或RELIANCE WR-D4005型號(hào)。遠(yuǎn)程背板可以是《RELIANCE WR-D4005輸入/輸出模塊規(guī)格手冊(cè)》（GEK-0898）中列出的任何RELIANCEWR-D4005.遠(yuǎn)程背板。? 如果系統(tǒng)僅包括擴(kuò)展背板，則從CPU到最后一個(gè)背板的總距離不能超過(guò)15米（50英尺）? 如果系統(tǒng)包括任何遠(yuǎn)程背板，則從CPU到最后一個(gè)背板的總距離不能超過(guò)213米（700英尺）。
遠(yuǎn)程背板在更遠(yuǎn)的距離上提供與擴(kuò)展背板相同的功能。遠(yuǎn)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(dāng)背板彼此相距很遠(yuǎn)且不共享同一接地系統(tǒng)時(shí)，可能會(huì)出現(xiàn)這種情況
CPU和遠(yuǎn)程背板之間的通信可能比CPU和擴(kuò)展背板之間的通訊花費(fèi)的時(shí)間稍長(zhǎng)。與總的CPU掃描時(shí)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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