What is the first step in determining the reason for the safety loop light fault?

The first step in determining the reason for the safety loop light fault involves checking the position of the Master key. This is crucial because the Master key is a significant control element in safety systems; it often serves to enable or disable certain functions or operations in machinery. If the Master key is not in the correct position, it can lead to the activation of fault indicators, such as the safety loop light, indicating that the system is impaired or not in the proper safe operational state.

Investigating the position of the Master key first allows you to rule out or confirm whether a fundamental control issue is causing the fault. If the key is not positioned correctly, the subsequent steps may be unnecessary, as correcting this issue can resolve the problem immediately.