你所有关心的故障信息，都可以通过相应的OB块读出谁出错，错在哪，错误码是什么等。根据错误类型不同，需要组态编程相应的OB块。


OB70 I/O Redundancy Error (only in H systems)
OB72 CPU Redundancy Error (only in H systems)


OB80 Time Error
OB81 Power Supply Error
OB82 Diagnostic Interrupt
OB83 Insert/Remove Module Interrupt
OB84 CPU Hardware Fault
OB85 Program Cycle Error
OB86 Rack Failure
OB87 Communication Error
OB121 Programming Error
OB122 Access Error