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XYCOM 9487-47B1319020000模擬量控制器
使用Datalinks Datalink是PowerFlex驅(qū)動器用來在數(shù)據(jù)之間來回傳輸數(shù)據(jù)的機制控制器。數(shù)據(jù)鏈接允許讀取或?qū)懭腧?qū)動器參數(shù)值不使用顯式消息。啟用時，每個Datalink占用一個ControlLogix控制器中的32位字。
使用PowerFlex 750系列驅(qū)動器Datalinks時，以下規(guī)則適用：?Datalink的目標(biāo)可以是任何主機參數(shù)，包括外圍設(shè)備例如，驅(qū)動器參數(shù)535-[Accel Time 1]可以是驅(qū)動器中安裝的任何或所有選項模塊的目標(biāo)。
?通過驅(qū)動器Datalink機制傳遞的數(shù)據(jù)由以下因素決定主機參數(shù)01…16-[DL From Net 01-16]和主機的設(shè)置參數(shù)17…32-[DL To Net 01-16]。
?當(dāng)包含數(shù)據(jù)鏈路的I/O連接處于活動狀態(tài)時，這些數(shù)據(jù)鏈路正在使用的被鎖定，并且在該I/O連接之前無法更改變得空閑或不活動。
?當(dāng)您使用Datalink更改值時，該值不會寫入非易失性存儲（NVS）。該值存儲在易失性存儲器中驅(qū)動器斷電時丟失。因此，在需要時使用Datalinks經(jīng)常更改參數(shù)的值。
PowerFlex 750系列驅(qū)動器外圍設(shè)備的數(shù)據(jù)鏈路（嵌入式EtherNet/IP僅PowerFlex 755驅(qū)動器上的適配器和選項模塊，如編碼器或通信模塊）在外設(shè)有I/O連接時被鎖定帶控制器。當(dāng)控制器與驅(qū)動器有I/O連接時，驅(qū)動器不允許重置為默認(rèn)值、配置下載或任何其他可能更改運行系統(tǒng)中I/O連接組成的操作。I/O必須首先禁用與控制器的連接，才能更改各自的數(shù)據(jù)鏈路。
根據(jù)使用的控制器，可以通過以下方式禁用I/O連接執(zhí)行以下操作：
?禁止RSLogix 5000軟件中的模塊
?將控制器置于程序模式
?將掃描儀置于空閑模式
?斷開驅(qū)動器與網(wǎng)絡(luò)的連接示例梯形圖邏輯計劃信息
本章各節(jié)中的梯形圖邏輯程序示例用于并操作PowerFlex 750系列驅(qū)動器。
示例程序的功能
示例程序使您能夠執(zhí)行以下操作：
?從驅(qū)動器接收邏輯狀態(tài)信息。
?發(fā)送邏輯命令以控制驅(qū)動器（例如，啟動、停止）。
?向驅(qū)動器發(fā)送參考，并從驅(qū)動器接收反饋。
?向驅(qū)動器發(fā)送/接收數(shù)據(jù)鏈路數(shù)據(jù)。
邏輯命令/狀態(tài)字
這些示例使用邏輯命令字和邏輯狀態(tài)字
PowerFlex 750系列驅(qū)動器。參見附錄D，邏輯命令/狀態(tài)字：PowerFlex 750系列驅(qū)動器以查看詳細(xì)信息。
Using Datalinks
A Datalink is a mechanism used by PowerFlex drives to transfer data to and from the controller. Datalinks allow a drive parameter value to be read or written to without using an Explicit Message. When enabled, each Datalink occupies one 32-bit word in a ControlLogix controller. The following rules apply when using PowerFlex 750-Series drive Datalinks: ? The target of a Datalink can be any Host parameter, including those of a peripheral. For example, drive parameter 535 - [Accel Time 1] can be the target of any or all option modules installed in the drive. ? The data passed through the drive’s Datalink mechanism is determined by the settings of Host Parameters 01…16 - [DL From Net 01-16] and Host Parameters 17…32 - [DL To Net 01-16]. ? When an I/O connection that includes Datalinks is active, those Datalinks being used are locked and cannot be changed until that I/O connection becomes idle or inactive. ? When you use a Datalink to change a value, the value is NOT written to the Nonvolatile Storage (NVS). The value is stored in volatile memory and lost when the drive loses power. Thus, use Datalinks when you need to change a value of a parameter frequently. Datalinks for PowerFlex 750-Series drive peripherals (embedded EtherNet/IP adapter on PowerFlex 755 drives only and option modules such as an encoder or a communication module) are locked when the peripheral has an I/O connection with a controller. When a controller has an I/O connection to the drive, the drive does not allow a reset to defaults, configuration download or anything else that could change the makeup of the I/O connection in a running system.
Example Ladder Logic Program Information
The example ladder logic programs in the sections of this chapter are intended for and operate PowerFlex 750-Series drives. Functions of the Example Programs The example programs enable you to do the following: ? Receive Logic Status information from the drive. ? Send a Logic Command to control the drive (for example, start, stop). ? Send a Reference to the drive and receive Feedback from the drive. ? Send/receive Datalink data to/from the drive. Logic Command/Status Words These examples use the Logic Command word and Logic Status word for PowerFlex 750-Series drives. See Appendix D, Logic Command/Status Words: PowerFlex 750-Series Drives to view details.The I/O connection with the controller must first be disabled to allow changes to the respective Datalinks. Depending on the controller being used, the I/O connection can be disabled by doing the following: ? Inhibiting the module in RSLogix 5000 software ? Putting the controller in Program mode ? Placing the scanner in idle mode ? Disconnecting the drive from the network
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