【正文】 步驟4 DeviceNet組態(tài)軟件（RSNetworx for DN） DeviceNet基本知識Multiple data exchange methods, including Polled, Cyclic, and Change of State (COS)If “Polled and COS” or “Polled and Cyclic” is used, the adapter receives the I/O from the polled messages. It transmits its Logic Status and Feedback in COS or Cyclic messages. Other data is transmitted in Polled messages.Polled: Polled Rate. Change of State: Heartbeat Rate. Cyclic: Send Rate.I/O Messaging:Explicit Messaging.Important: There must be a request message and a response message for all Explicit Messages, whether you are reading or writing dataDevicenet Object Model:Class (Object type)Instance of Class (Object ID)Service (Service Code, available services depend on the class and instance that you are using)Attribute of Class or Instance (Object Attribute).Explicit and UCMM (Unconnected Message Manager) Messages RSNetworx for DN操作步驟Cyclic and Polled data exchanges are configured in the scanner, COS data exchange must be configured in both the adapter and the scanner.Using I/O Messaging: Some types of I/O messaging allow a parameter value to be changed without using an Explicit Message. When you use them to change a value, the values are not written to the NonVolatile Storage (NVS). They should be used for frequently changed parameters in program.Using Explicit Messages.! Typically, Explicit Messages may write parameter data to NonVolatile Storage (NVS). Do not create a program that uses Explicit Messages to write parameter data to NVS. (When frequently written, the NVS will quickly exceed its life cycle and cause the drive to malfunction.) For MSG: PathThe path includes the following: