33 FUNCTIONS
33.1 Safety Operation Mode
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Safety operation mode state transition
The Safety CPU retains the safety operation mode even in the event of a power failure, and therefore the current safety
operation mode state will remain unchanged even if the CPU module is powered off and on or is reset. Safety function
modules do not retain the safety operation mode in the event of a power failure, and the safety operation mode will be the
same as that of the Safety CPU when the CPU module is powered off and on or is reset.
If [Online] [User Authentication] [Initialization of all PLC Data] is performed, the safety operation mode
will revert to the default mode (TEST MODE). All programmable controller information can be initialized
regardless of the safety operation mode.
Safety operation mode
state
Status transition by operation
Power off on or reset Safety operation mode switching operation
TEST MODE SAFETY MODE SAFETY MODE TEST MODE
TEST MODE TEST MODE SAFETY MODE (wait-for-restart)
SAFETY MODE SAFETY MODE TEST MODE
SAFETY MODE (wait-for-restart) SAFETY MODE TEST MODE
TEST MODE
The Safety CPU is
powered off and on
or reset.
Mode switching
(SAFETY MODE → TEST MODE)
• Factory default
• When the safety CPU operation mode
becomes unknown
Mode switching
(SAFETY MODE (wait-for-restart)
→ TEST MODE)
Mode switching
(TEST MODE → SAFETY MODE)
SAFETY MODE
The Safety CPU is
powered off and on
or reset.
SAFETY MODE
(wait-for-restart)
The Safety CPU is powered on
or reset.
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