Acquire Image Tool Properties Customizing The Error Response Program The default error response program does not perform any operations: This program should be modified to implement any custom operations that are required. Typically, this might involve setting application specific variables or triggering other custom operations. As an example, here is custom code that shows a typical customization that might take place. When the error program is called, it will use digital I/O to communicate with an external PLC. After continuing, it checks the system power state: ACE Reference Guide, 18317-000 Rev A Page 702