Allen-Bradley · MicroLogix 1400 Programmable Controllers
An output overlap is detected, meaning multiple functions are assigned to the same physical output. This is a configuration error (e.g., PTO0 and PTO1 attempting to use a single output) that causes the controller to fault, and the User Fault Routine does not execute.
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Review the PTOX instruction configuration for all PTOX instances (e.g., PTO0, PTO1) and verify that each is assigned to a unique physical output.
Check for any other controller functions that might be inadvertently assigned to the same physical output as a PTOX instruction.
Modify the program to ensure each physical output (e.g., Output 2, 3, or 4) is used by only one instruction at a time.