其实还是应该耐下心来看看帮助，英文不用翻译了吧：
The operating system of the CPU calls OB86 whenever the failure of an expansion rack (not with CPU 318), a DP master system, or a station is detected in the distributed I/Os (both when entering and outgoing event)
OB86_EV_CLASS BYTE Event class and identifiers:
[COLOR=#FF0000]B#16#38: outgoing event
B#16#39: incoming event[/COLOR]