How do I use an unsolicited message to send data to FactoryTalk Transaction Manager?
In some cases it is desirable to use an unsolicited message from a programmable logic controller (PLC) to log data to a database. This is usually used to reduce network traffic by eliminating the need to have RSLinx Classic continually poll the PLC for changes in the data. There are several steps to setting up a transaction in FactoryTalk Transaction Manager to receive an unsolicited message and log it to a database. PLC Message Instruction: This example is for a PLC-5. In RSLogix5, access the message instruction (MSG) setup dialog. Set the PLC Communication Command to PLC-5 Typed Write. The Data Table Address is the starting address of the block you wish to transmit and the Size of Elements is the number of words or elements that you wish to transmit. Although the Target Device Data Table Address does not exist in the PLC itself, the DDE/OPC item in FactoryTalk Transaction Manager must match this address. RSLinx Classic Topic Configuration: In RSLinx Classic, display the DDE/OPC Topic
