ISO 13842: What is OTE?

OTE means Output of the test equipment. This refers to the error output of a diagnostic channel which is triggered when a fault in the safety function is detected (and triggers a reaction such as a safe shutdown).

Source: ISO 13842-1:2023 Table 1, also shown in DGUV BGIA-Report 2/2008 Funktionale Sicherheit von Maschinensteuerungen - Anwendung der DIN EN ISO 13849, figure 6.6