TLY-A2540P-BJ64AA A-B  Analog Input Module

The RPI is the update rate that is specified for a particular piece of data on the network. The RPI can be specified for the adapter and include all of the I/O modules communicating through it (using a rack-optimized connection) or specified for a particular module (using direct connection). When you add a module or an adapter to the I/O configuration of a controller, you must enter the RPI as a parameter. This value specifies how often to produce the data for that device. For example, if you specify an RPI of 50 ms, it means that every 50 ms the device should send its data to the controller or the controller should send its data to the device. RPIs are only used for devices that produce data. For example, a ControlLogix EtherNet/IP bridge in the same chassis as the controller does not require an RPI because it is not a dataproducing member of the system; it is used only as a bridge to remote racks.

The 1794-AENTR and 1794-AENTRXT adapters support both direct and rack-optimized connections. A direct connection is a real-time data transfer link between the controller and the device that the configuration data references. Direct connection messaging occurs at a cyclic rate that is specified by the RPI during configuration. A rack-optimized connection is a grouping of data from multiple I/O module into a single block of data sent over a single connection at the same data rate. Rack-optimized connections reduce the total number of connections that are needed to transfer data when using many I/O modules in a system. The following example illustrates the benefit of rack-optimized connections. Assume you have set up a system that contains eight discrete I/O modules interfaced to an adapter. If you use direct connections to transfer data to each of these I/O modules, you need eight connections to transfer all of the data, one to each of the eight I/O modules. If you use a rack-optimized connection to transfer the data, you only need a single connection – The connection to the adapter.

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