Catalog Number 1756-IF4FXOF2F Rockwell

Catalog Number 1756-IF4FXOF2F Rockwell

Catalog Number 1756-IF4FXOF2F Rockwell

The Studio 5000 Engineering and Design Environment combines engineering and design elements into a common environment. The first element in the Studio 5000 environment is the Logix Designer application. The Logix Designer application is the rebranding of RSLogix 5000 software and will continue to be the product to program Logix5000™ controllers for discrete, process, batch, motion, safety, and drive-based solutions.

1. Timing Relationships in the Same Chassis:

• When the 1756-IF4FXOF2F module is in the same chassis as its owner-controller, the timing relationships between RPI, RTS, and the Event task with a Module Input Data State Change trigger are crucial.
• RTS (Real-Time Sampling):
  • Describes the rate at which the module retrieves new input data samples from its channels.
  • The module scans all channels with each RTS, and due to the inability to scan simultaneously, there’s an approximate 1 μs time gap.
  • After completing the scan, the module sends updated data across the backplane, triggering the Event task.
• RPI (Requested Packet Interval):
  • Represents the rate at which the module produces and receives data from the controller.
  • Outputs are consistently updated at the RPI rate regardless of the RTS value.

2. Considerations for Remote Modules:

• When the 1756-IF4FXOF2F module is not in the same chassis as its owner-controller, certain considerations come into play.
• Update Rates for Network Interface Cards:
  • Update rates may be slower for network interface cards and network bandwidth, especially with faster RTS rates (less than 4 ms).
• ControlNet Network:
  • If on a ControlNet network, the module retrieves channel input data at the RTS rate, but data production on the network occurs only at the RPI rate.
• EtherNet/IP Network:
  • On an EtherNet/IP network, the module retrieves channel input data at the RTS rate but produces data on the network at a rate no faster than the RPI divided by four.

3. Choosing a Communication Format:

• To determine the suitable communication format for your data storage application, consider the following factors:
• CST Timestamp:
  • A CST timestamp is valuable when you need to know when data samples are retrieved or when establishing a time relationship with other modules or axis data.
• Data Production Rate:
  • The combination of RTS and RPI values determines the rate at which new data is produced, influencing the choice of communication format.

4. Integration of Analog Data and Other Modules:

• If your application involves integrating analog data with other modules or axis data, consider the presence of a CST timestamp.
• Understanding the rate at which new data is produced is essential, determined by the interplay of RTS and RPI values, as explained in the Timing Relationships section.

By organizing the information in this manner, the article conveys a clear progression from timing relationships within the same chassis to considerations for remote modules and ultimately guides the reader in choosing an appropriate communication format for their specific application.