InValue Expired (Positive)

What does 0x40C9 mean?

The input value (InValue) has expired, and its current state is above zero. This suggests that the input signal has either become invalid or has risen above its expected range, leading to a safety state. The fault provides the FB instance, the current InValue, and the MaxAllowedValue for detailed diagnosis.

• Complete loss of input signal (e.g., 0-10VDC sensor with broken wire resulting in 10V or higher due to pull-up resistance).
• Sensor malfunction where its output consistently rises above its specified maximum range (e.g., 10VDC from a 0-10V sensor when process is normal).
• Incorrect scaling or offset applied to the analog input, causing valid readings to be interpreted as over-range (e.g., parameter P3-03).
• Faulty analog input module channel (e.g., EL3xxx channel 2) reading above its defined input range.

Click steps to track your progress.

1. 1

   1. Measure the voltage or current at the analog input terminals (e.g., AI_B) of the safety module.

2. 2

   2. Verify the sensor's output (e.g., 4-20mA, 0-10V) directly at the sensor terminals.

3. 3

   3. Check the scaling and offset parameters (e.g., P3-03, P3-04) in the TwinSAFE configuration for the analog input.

4. 4

   4. Inspect the input signal wiring for short circuits to an external voltage or incorrect termination.

5. 5

   5. Replace the sensor if its output remains above the valid range even when the process value is acceptable.