Is it possible for an HMI to access the Description of ControlLogix PLC tags? It is a recent development for PLCs to store tag descriptors in their own memory, allowing them to be uploaded along with the program. Being able to read and write these descriptors would greatly save time for HMI operators.
When working with an HMI in FactoryTalk software, it is essential to ensure that you are using firmware version 21 or newer on the controller. To display the description, you can utilize a String Display object. Additionally, FactoryTalk View should be at least version 6.2. To access the extended tag property, use the format TagName.@ExtendedProperty, where TagName represents the controller tag and ExtendedProperty signifies the extended tag property. For instance, you can use [Shortcut]SodaCIPTanks.Water.Value.@Description to view the tag description. Please note that this connection is read-only, and any modifications to the description in the PLC must be done directly on the controller.
User tonydmm2 inquired whether an HMI can access the descriptions of ControlLogix PLC tags. Recently, PLCs have begun storing tag descriptors in their memory, making it possible to retrieve them during uploads. This feature could save time if the HMI could access and modify these descriptors. Can an HMI access bit positions or array positions as well? For example, in the case of an INT data type with 16 bits, users can read the description of a bit using "TagName.0.@Description." However, they are also interested in retrieving the bit position. Is this functionality available?
Operaghost mentioned the importance of specifying the HMI being used. In FactoryTalk, the description can be retrieved and displayed using a String Display object, requiring a controller firmware of v21 or newer and FactoryTalk View version 6.2 or higher. To access this information, use the format TagName.@ExtendedProperty where TagName represents the controller tag and ExtendedProperty is the extended tag property. For instance, [Shortcut]SodaCIPTanks.Water.Value.@Description. This feature is read-only, preventing modifications to the PLC description via the HMI. Can an HMI access bit positions or array positions? If so, assistance is requested in this matter. For example, when dealing with an INT (16 bits), the description of a bit can be obtained using "TagName.0.@Description." However, the ability to retrieve the bit position is also desired. Is this functionality achievable?
Absolutely, it is indeed possible for an HMI to access the Description of ControlLogix PLC tags. This feature has been a game-changer in enhancing operator efficiency. However, accessing the descriptions largely depends on the communication protocol being used. Furthermore, the specific HMI software might need certain scripting or it may require a direct support integration feature to read these descriptions. It's important to evaluate these factors before implementation to maximize the benefits of this feature.
Absolutely, accessing the tag descriptors from a ControlLogix PLC can significantly streamline HMI development and maintenance. With the recent advancements, if the HMI software supports it, operators can pull these descriptors directly into their projects, making it easier to understand the functions without having to refer back to separate documentation. That not only improves efficiency but also reduces the potential for errors, as everyone is literally on the same page regarding tag function. It would be great to see more HMI manufacturers integrating this capability!
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Answer: 1. Can an HMI access the Description of ControlLogix PLC tags? - Yes, it is possible for an HMI to access the Description of ControlLogix PLC tags if the PLC is storing tag descriptors in its memory and allowing them to be uploaded along with the program.
Answer: - HMI operators can save time by easily accessing and understanding the tag descriptions, which can help improve efficiency and reduce the chances of errors during operation.
Answer: - Yes, the ability for PLCs to store tag descriptors in their memory and allow them to be uploaded along with the program is a recent development that provides added convenience for HMI operators.
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