Mitsubishi Electric QS001CPU User Manual page 29

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OVERVIEW
(2) The safety CPU operation mode is equipped for safe system operation
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
(b) TEST MODE
For the details of operations available in the SAFETY MODE and TEST MODE, refer
to the following manual.
(3) Enriched operation history and error history
The CPU module can record up to 3000 logs of user operations performed on the
CPU module, and errors occurred in the CPU module, CC-Link Safety, or CC-Link IE
Field Network.
User operations and errors will be recorded as operation/error history data in
chronological order.
Checking the operation/error history data helps users perform troubleshooting easier.
The contents recorded in the operation/error history are shown in Table1.2.
Information
Operation
history
information
Error history
information
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.
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.
QSCPU User's Manual (Function Explanation, Program Fundamentals)
Table1.2 Recorded contents of operation/error history
Contents
User's operations for the CPU module are
stored as a history.
(Operations which change the CPU module
status are recorded.)
The following errors are stored as a history.
• Error/failure detected by self-diagnostics
• Hardware error
• Error detected in CC-Link Safety
• Error detected in the CC-Link IE Field
Network
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)
1.1 Features
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