Mitsubishi MELSEC QS Series User Manual page 28

1
OVERVIEW
(2) The safety CPU operation mode is equipped for safe system operation
(3) Enriched operation history and error history
1
- 4 1.1 Features
The CPU module is equipped with two safety CPU operation modes. "SAFETY
MODE" for safe system operation and "TEST MODE" for system construction and
maintenance.
These two modes prevent the user's erroneous operations for safe system operation.
(a) SAFETY MODE
SAFETY MODE is a mode for safe system operation. This mode prohibits the
write operation from a programming tool and the device test operation during the
system operation.
(b) TEST MODE
TEST MODE is a mode for maintenance. This mode enables the write operation
from a programming tool and the device test operation to debug or maintain the
sequence program.
The CPU module can record a total of 3000 details of the CPU module operation by
the user and errors occurred in the CPU module or CC-Link Safety as operation/error
history data.
Recording the details of the CPU module operation by the user into the operation/
error history clarifies the occurrence order of operations and errors. Troubleshooting
becomes easier by confirming the error/operation history.
The contents recorded in the operation/error history are shown in Table1.2.
Table1.2 Recorded contents of operation/error history
Information
User's operations for the CPU module are
Operation
stored as a history.
history
(Operations which change the CPU module
information
status are recorded.)
The following errors are stored as a history.
Error history • Error/failure detected by self-diagnostics
information • Hardware error
• Error detected by CC-Link Safety
Contents History Information per Entry
• Operation code
• Operation message
• Operation execution date
• Result code
• Operation attached information
• Error code
• Error message
• Occurrence date
• Error information category (common
information/individual information)
• Error information (common
information/individual information)