Mitsubishi Electric MELSEC iQ-R-R00CPU User Manual page 658

Safety operation mode state transition
The SIL2 Process 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. The SIL2
function module does 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 SIL2 Process CPU when the CPU module is powered off and on or is reset.
• Factory default
• When the safety CPU operation mode
becomes unknown
The Safety CPU is
powered off and on
or reset.
Safety operation mode status
TEST MODE
SAFETY MODE
SAFETY MODE (wait-for-restart)
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.
37 FUNCTIONS
656
37.8 Switching Safety Operation Mode
Mode switching
(SAFETY MODE → TEST MODE)
TEST MODE
Mode switching
(SAFETY MODE (wait-for-restart)
→ TEST MODE)
Mode switching
(TEST MODE → SAFETY MODE)
State transition by operation
Power off  on or reset
 TEST MODE
 SAFETY MODE
 SAFETY MODE
SAFETY MODE
The Safety CPU is powered on
or reset.
SAFETY MODE
(wait-for-restart)
Safety operation mode switching operation
TEST MODE  SAFETY MODE SAFETY MODE  TEST MODE
 SAFETY MODE (wait-for-restart)


The Safety CPU is
powered off and on
or reset.

 TEST MODE
 TEST MODE