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Resetting Data Block Messages (DB9.DBX107.1)

The persistent "1" value in DB9.DBX107.1 after issue resolution and PLC restart indicates a latched error or flag. Your attempted reset logic isn't sufficient because the bit is likely being re-set elsewhere in the program or by a hardware condition.

Here's a more robust approach, along with debugging steps:

Recommended Reset Logic:

1. Find the Setting Logic: First, identify where DB9.DBX107.1 is being set to '1'. Use the cross-reference function in TIA Portal (Navigate -> Cross-References) to locate all instances where DB9.DBX107.1 is written to.
2. Conditional Reset: Reset the bit *only* when the triggering condition for the original set is no longer true. This prevents it from immediately being re-latched.
3. Reset Code Example (Ladder Logic):

         Network 1:  // Reset Button Logic
         A     M105.1   // Reset Push Button
         AND   NOT   //Important!  Only reset when the original fault is cleared.
         R     DB9.DBX107.1
       

Debugging Steps:

• Online Monitoring: Go online with the PLC and monitor DB9.DBX107.1. Observe *exactly* when it gets re-set to '1'.
• Force Value: Temporarily force DB9.DBX107.1 to '0' online to see if it holds. If it immediately reverts to '1', something is actively setting it.
• Search Program: Use TIA Portal's search function to look for instances of "DB9.DBX107.1" within your program blocks.

Resources:

• Siemens Support Article: How do you reset a bit in a data block?
• TIA Portal Documentation: TIA Portal Documentation

If these steps don't resolve the issue, please provide more details about the triggering condition for DB9.DBX107.1, and I can assist further.