Configuring a Remote I/O Node is very similar to configuring a DeltaV controller. Select Properties from the Remote I/O Node's context menu to configure the Remote I/O Node. Use the dialog's context-sensitive help for information on the configuration options. Similarly, configuring a remote I/O card is similar to configuring standard DeltaV I/O cards. However, remote I/O cards have a configurable scan rate. The scan rate controls how often the card data is moved between the controller and the Remote I/O Node. Valid scan rates are 100 ms, 200 ms, 500 ms, and 1 second. The default value is 500 ms. Increasing the scan rate increases the loading on the network, controller, and Remote I/O Node.
Do not confuse a remote I/O card's scan rate, the rate at which the card data is moved between the controller and the Remote I/O Node, with a module's scan rate (also called module execution time). A module's scan rate is the rate at which the module executes. For modules configured to read signals from remote I/O channels, the module's scan rate should be twice as slow as the remote I/O scan rate. For example if the remote I/O scan rate is 100 ms, the module's scan rate should be 200 ms; if the remote I/O scan rate is 200 ms, the module's scan rate should be 500 ms. (Remember that valid scan rates are 100 ms, 200 ms, 500 ms, and 1 second.) A module scan rate of 100 ms is not supported by remote I/O cards and will negatively affect the card's performance.