Analog Input/PWM Output Malfunction (AI531/CD522)

What does E4-258 mean?

For analog input AI531, the measurement is incorrect due to an excessively high potential difference. For PWM output CD522, the duty cycle is operating outside its acceptable range. Both issues can lead to inaccurate control, component damage, or system instability, requiring immediate attention to prevent operational errors.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Review the module's configuration for correct scaling, input ranges, and PWM duty cycle limits.

2. 4

   Inspect the I/O module and connected devices for any signs of damage or malfunction.