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XYCOM 9487-47B1319020000模拟量控制器
使用Datalinks Datalink是PowerFlex驱动器用来在数据之间来回传输数据的机制控制器。数据链接允许读取或写入驱动器参数值不使用显式消息。启用时，每个Datalink占用一个ControlLogix控制器中的32位字。
使用PowerFlex 750系列驱动器Datalinks时，以下规则适用：•Datalink的目标可以是任何主机参数，包括外围设备例如，驱动器参数535-[Accel Time 1]可以是驱动器中安装的任何或所有选项模块的目标。
•通过驱动器Datalink机制传递的数据由以下因素决定主机参数01…16-[DL From Net 01-16]和主机的设置参数17…32-[DL To Net 01-16]。
•当包含数据链路的I/O连接处于活动状态时，这些数据链路正在使用的被锁定，并且在该I/O连接之前无法更改变得空闲或不活动。
•当您使用Datalink更改值时，该值不会写入非易失性存储（NVS）。该值存储在易失性存储器中驱动器断电时丢失。因此，在需要时使用Datalinks经常更改参数的值。
PowerFlex 750系列驱动器外围设备的数据链路（嵌入式EtherNet/IP仅PowerFlex 755驱动器上的适配器和选项模块，如编码器或通信模块）在外设有I/O连接时被锁定带控制器。当控制器与驱动器有I/O连接时，驱动器不允许重置为默认值、配置下载或任何其他可能更改运行系统中I/O连接组成的操作。I/O必须首先禁用与控制器的连接，才能更改各自的数据链路。
根据使用的控制器，可以通过以下方式禁用I/O连接执行以下操作：
•禁止RSLogix 5000软件中的模块
•将控制器置于程序模式
•将扫描仪置于空闲模式
•断开驱动器与网络的连接示例梯形图逻辑计划信息
本章各节中的梯形图逻辑程序示例用于并操作PowerFlex 750系列驱动器。
示例程序的功能
示例程序使您能够执行以下操作：
•从驱动器接收逻辑状态信息。
•发送逻辑命令以控制驱动器（例如，启动、停止）。
•向驱动器发送参考，并从驱动器接收反馈。
•向驱动器发送/接收数据链路数据。
逻辑命令/状态字
这些示例使用逻辑命令字和逻辑状态字
PowerFlex 750系列驱动器。参见附录D，逻辑命令/状态字：PowerFlex 750系列驱动器以查看详细信息。
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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