I am working with an array of DINTs to create alarms and streamline my process. I am attempting to leverage a loop in structured text for efficiency, specifically to handle around 120 alarms. However, I encountered an issue when trying to set a bit in a DINT[10] array, receiving an error of "invalid member specifier." I initially thought I could access it using "Tag[0].i", but it seems to be incorrect.
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mk42 asked about a specific PLC model. Click to expand to find out more about the 1769-L33ER PLC.
When asked about the specific programmable logic controller (PLC) being referred to, mk42 hinted at "Tag[0].[j]" as a potential match.
Hey everyone, I'm curious if it's feasible to use indirect addressing to access specific bits within a dint data type tag in Studio5000 ladder logic. Any insights on this topic? Join the discussion on the MRPLC forums!
AMarks95 mentioned having an array of DINTs to represent alarms and wanting to streamline the process using a loop in structured text for efficiency. However, encountering an error message when trying to set a bit in a DINT[10] array. The expected method of accessing it via "Tag[0].i" did not work as expected. It is suggested to consider using or creating a User-Defined Type (UDT) for alarms and then creating an array based on that for a smoother implementation.
It seems like you're trying to directly set values in an array of DINTs which may be causing the issue. Instead of using direct access like "Tag[0].i", try looping through the array in a FOR loop and assign bits one at a time using structured text. Make sure to keep in mind that bit indexes start at 0. Structured text allows you to do this very effectively and can help streamline your process with large number of alarms. If it's still not working, do check the array boundary conditions to prevent any out-of-bounds errors.
It sounds like you're on the right track with your idea to use a loop for efficiency, but the way you're trying to access the bit in the DINT array might need a bit of tweaking. Instead of using "Tag[0].i", try using "Tag[0] AND (1 << bit_position)" to manipulate specific bits in your DINT. If you're setting a particular bit, you can use "Tag[0] := Tag[0] OR (1 << bit_position);" to set it, where `bit_position` is the index of the bit you want to modify. Also, make sure that the array is properly indexed and that you are operating within the bounds. This should help resolve the member specifier issue you're facing!
It sounds like you're on the right track by trying to use loops for efficiency, but it looks like you're running into some syntax issues. When working with arrays in structured text, the correct way to access and manipulate the bits of a DINT would typically be through a bitwise operation. If you're looking to set a specific bit in a DINT array, you would generally use a bitwise OR operation with a bit mask, like this: `Tag[index] := Tag[index] OR (1 << bitNumber);`. Make sure to replace `index` and `bitNumber` with the actual values for your use case. Double-check also that you're not trying to access a member of a DINT as if it were a user-defined type; this can often lead to the "invalid member specifier" error. Hope this helps!
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Answer: Answer: To efficiently handle alarms using a DINT array in structured text, you can iterate through the array using a loop to streamline the process and manage multiple alarms effectively.
Answer: Answer: The error "invalid member specifier" typically occurs when there is a syntax issue in accessing a specific element within a structured data type. Make sure to use the correct syntax to access elements in your DINT array.
Answer: Answer: To access elements in a DINT[10] array within structured text, you should use the correct syntax, such as "Tag[0]" to refer to the first element in the array. Avoid using incorrect specifiers like "Tag[0].i" which may lead to errors.
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