Mitsubishi Q00JCPU User Manual page 342

6
FUNCTIONS
(4) Error history checking
(5) CPU module operation at the time of error detection
6
6.17 Self-diagnostics Function
- 101
The CPU module stores 16 latest error codes. (
The failure history can be checked in the GX Developer function PLC diagnostics
mode.
The failure history can be stored even when the power is shut off using the battery
backup.
(a) Mode at error detection
When an error is detected from the self-diagnosis, there are two types of modes
that the CPU module operation can change to.
1) CPU module calculation stop mode
At detection of an error, the CPU module stops operation and turns OFF all
external outputs of the modules set to "Clear" (default) in the "error time output
mode" in the I/O assignment setting of the PLC parameter dialog box. (The
output (Y) on the device memory is held.)
Note that the external outputs of the modules set to "Hold" in the "error time
output mode" are held. (The output (Y) of the device memory is held.)
2) CPU module calculation continue mode
At detection of an error, the CPU module executes programs other than the
one that has developed the error.
Section 6.18)