Hello everyone, I am working with a DINT array containing 99 entries. I am looking for a way to assign values to each array element based on the number selected on the HMI. For example, if the operator selects ID 15 and enters a length of 50, the HMI will write 50 to DINT[15]. Is there a way to achieve this functionality?
If your Human Machine Interface (HMI) allows for indirect addressing, you can perform all actions within it. The handling of this feature may vary depending on the HMI environment, with the ID typically serving as an internal placeholder within the HMI system. For instance, the "Length" box could be represented as ExampleDINT[Placeholder]. If your HMI does not support indirect addressing, you can achieve the same functionalities within the Programmable Logic Controller (PLC) using similar methods. However, you may need to incorporate additional logic to complete the task. This could involve creating a buffer tag for the number "50" and implementing a mechanism to detect changes in order to trigger the writing of the value "15." Alternatively, you could add an execute button on the screen for manual input. Utilize your ID number to copy the data to the correct index and monitor for index changes to update the displayed number effectively.
JJG0701 asked if there is a way to assign values to a DINT array with 99 entries based on the numbers selected on the HMI. For example, if the operator selects and enters ID 15 and inputs 50 as the Length, the HMI will write 50 to DINT[15]. To write a single value to a specific array index, a simple mov operation can be used. If the intention is to write different values to multiple array indices starting at 15, a FAL instruction should be utilized.
Absolutely, you can achieve this by linking the selected ID from your HMI to an index in your array. Then, you simply assign the value entered by the operator to the array element at that index. Remember, most programming languages use zero-based indexing, so adjust accordingly if your ID starts from 1. Do check for boundary conditions to avoid overwriting data beyond the array length. Lastly, don't forget to refresh your HMI to reflect the latest status of your DINT array for better GUI experience.
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Answer: 1. How can I assign values to a DINT array based on HMI input in a PLC system? - To assign values to a DINT array based on HMI input, you can use the HMI to select an index (ID) and enter a value, which the PLC will then write into the corresponding element of the DINT array.
Answer: - The process involves capturing the selected index (ID) and value input from the HMI interface, then using this information to write the value into the corresponding element of the DINT array in the PLC program.
Answer: - Certainly! Here's a basic example of how you can achieve this functionality: - Read the selected index (ID) and value input from the HMI. - Use the selected index to access the corresponding element in the DINT array. - Write the entered value into the selected element of the DINT array.
Answer: - It is important to validate the input values from the HMI to ensure they fall within the acceptable range for the array indices. Additionally, error handling mechanisms should be in place to handle any unexpected input or communication issues between the HMI
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