Configure CIP Options - Connections for ControlLogix Processors

To configure connections for ControlLogix processors, perform the following steps:
  1. Enter the maximum number of allowable ControlLogix messaging connections per PLC. The default number of connections is 4.
  2. Select the
    Messaging Connection Parameters
    . Once RSLinx Classic opens a connection to send a CIP request to a ControlLogix processor, it leaves the connection open for future CIP requests, however, a connection timeout interval and a retry interval are specified when the connection is opened.
    • Connection Timeout Interval - If this timeout interval expires before the connection is used again, RSLinx Classic, the ControlLogix processor, and any bridge between them terminates the connection.
    • Retry Interval - If RSLinx Classic sends a CIP request on a connection and the retry interval expires before a response is received, RSLinx Classic resends the request. If the ControlLogix processor received the original request, it recognizes this as a retry and does not process the request again.
  3. Select the
    Use Connections for Writes to ControlLogix processors
     check box when writing to a ControlLogix processor from DDE/OPC. The default is to use a CIP connection to write data. If you are not sending data to the controller very often, clear this check box; however, in some cases this may cause messages to be lost.
  4. If an entire UDT is 480 bytes or less, select the
    Optimize User Defined Templates
     check box to try to read the entire UDT at a time from the ControlLogix processor.
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