1793-OB16P/AB Digital Output Module

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Brand Name                 AB

Product reference      1793-OB16P

In this example, the Logix5000 controller uses a ControlNet communication module in the local chassis to connect to the ControlNet network. The distributed (remote) I/O has a ControlNet adapter to connect it to the ControlNet network.

Make sure: • all wiring and cabling is properly connected • the communication driver [such as, AB-PCIC(S)-1] is configured for the programming workstation Setting a Requested Packet Interval (RPI) When you configure an I/O module, you define the RPI for the module. The RPI specifies the period at which data updates over a connection. For example, an input module sends data to a controller at the RPI that you assign to the module. Configure the RPI in milliseconds. RPIs are only used for modules that produce or consume data. For example a local ControlNet communication module does not require an RPI because it is not a data-producing member of the system; it is used only as a bridge. In Logix5000 controllers, I/O values update at a period that you configure via the I/O configuration folder of the project. The values update asynchronously to the execution of logic. At the specified interval, the controller updates a value independently from the execution of logic. Set the RPI only as fast as needed by the application. The RPI determines the number of packets per second on a connection. Each I/O module has a limit of how many packets it can handle per second. If you exceed this limit, the module cannot open any more connections.

When you configure a remote ControlNet communications module or an I/O module, you select a communication format. The communication format you choose determines the data structure for the tags that are associated with the module. Many I/O modules support different formats. Each format uses a different data structure. The communication format that you choose also determines: • Direct or rack-optimized connection • Ownership of outputs For a remote ControlNet communications module, you must select one of the formats listed below

For I/O modules, the available communication formats depend on the module type. In general:

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