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FieldServer FS-RA-CLX-BAS instruction manual Appendix A.4. Dealing with ControlLogix RPI Settings

Models: FS-RA-CLX-BAS

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Appendix A.4. Dealing with ControlLogix RPI Settings

When setting up the SlotServer for ControlLogix, it is necessary to select the Request Packet Interval (RPI). The RPI is the rate at which data is transferred to and from the SlotServer IO buffers. The following factors need to be considered when deciding on an RPI:

1.Minimum RPI setting for the SlotServer is 100ms.

2.The Scan_Interval parameter of the two Logix Map descriptors must be larger than the RPI to ensure smooth communications and prevent timeouts.

3.The number of message blocks used does not affect the RPI setting, but will affect the effective update rate for any one message block. The effective update rate for data to/from the SlotServer’s Data Arrays to the Logix CPU tags is the scan interval of the block since data is updated to the block every scan interval. Increasing the number of blocks will decrease the effective update rate per block. This update rate does not include the time taken to obtain data from the third party network, which is dependant entirely on the third party protocol involved.

4.The program scan rate should be set to run faster than the RPI. We recommend twice as fast. If the ladder program scan is slower than the RPI rate, it would be possible to miss some blocks altogether. It is further recommended that diagnostics be added to the ladder program to detect missed blocks

The effective update rate can be calculated using the following formula:

Effective update rate (EUR) = Scan interval * (number of msg block pairs6)

e.g. (EUR)

=

0.2s

* 1 = 0.2s

when using only one input and output block

e.g. (EUR)

=

0.2s

* 25 = 5s

when using the full LonWorks Open Interface configuration.

6a message block pair consists of an output and input block

FieldServer Technologies 1991 Tarob Court Milpitas, California 95035 USA Web:www.fieldServer.com Tel: (408) 262-2299 Fax: (408) 262-2296 Toll_Free: 888-509-1970 email: support@fieldServer.com

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FieldServer FS-RA-CLX-BAS instruction manual Appendix A.4. Dealing with ControlLogix RPI Settings
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FS-RA-CLX-BAS specifications

The FieldServer FS-RA-CLX-BAS is a robust communication gateway designed to facilitate interoperability between building automation systems and various network protocols. Its main objective is to provide seamless integration, allowing different systems to communicate effectively, regardless of their underlying technologies.

One of the standout features of the FS-RA-CLX-BAS is its support for a wide range of communication protocols. It can easily bridge between BACnet, Modbus, Johnson Controls N2, and several others, making it an invaluable tool in diverse environments where equipment from multiple manufacturers needs to work together. This extensive compatibility helps streamline operations, reduce costs, and enhance system efficiency.

The device is designed with a user-friendly interface that simplifies setup and configuration. It features a web-based management platform that allows system integrators and technicians to configure settings, monitor system performance, and perform troubleshooting tasks remotely. This accessibility is particularly beneficial in minimizing downtime and ensuring that systems operate optimally.

FieldServer Technologies has also implemented advanced data logging capabilities within the FS-RA-CLX-BAS. Users can track real-time data trends, monitor system performance, and analyze historical data to make informed decisions. This feature is essential for identifying inefficiencies and enabling proactive maintenance, thus extending the lifespan of building systems.

The FS-RA-CLX-BAS is built with durability and reliability in mind, designed for use in demanding environments. Its compact design and robust construction allow for easy integration into existing setups without requiring extensive modifications. Additionally, with support for both wired and wireless communication methods, it offers flexibility in installation.

Beyond its core functions, the FS-RA-CLX-BAS is also equipped with security features to protect sensitive data being transmitted across networks. Encryption protocols help ensure that communications remain secure, mitigating risks associated with unauthorized access.

In summary, the FieldServer FS-RA-CLX-BAS stands out as a versatile and reliable solution for integrating various building automation systems. With its multi-protocol support, user-friendly interface, advanced data logging capabilities, and robust security measures, it empowers facility managers and system integrators to enhance operational efficiency while maintaining a high level of security and reliability. This makes it a key asset for modern building management and automation strategies.