Safety I/O HOLD time exceeded error

What does 1500H mean?

The duration for which the I/O system remained in a HOLD state exceeded its pre-set time limit. This typically occurs in safety-critical applications when there are issues with system switching or communication with Safety Integrity Level 2 (SIL2) Process CPUs.

• An error occurred on the switching of systems incorporating SIL2 Process CPUs, causing an extended HOLD state.
• An error occurred in communications with a SIL2 Process CPU, leading to the prolonged I/O HOLD condition.

Click steps to track your progress.

1. 1

   Check all components and logic involved in the switching of systems that utilize SIL2 Process CPUs for any errors.

2. 2

   Verify the integrity and functionality of communication links and protocols with the SIL2 Process CPU for any detected errors.