37 FUNCTIONS
37.8 Switching Safety Operation Mode
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37
37.8
Switching Safety Operation Mode
This section describes how to switch the safety operation mode.
Safety operation mode transition timing
The following table shows the timing at which safety operation mode switches.
The SIL2 Process CPU retains the safety operation mode status even when the CPU module is powered off or
is reset.
Safety operation mode switching direction
Safety operation mode switch timing
TEST MODE
SAFETY MODE
When the CPU module is powered off and on or is reset after the safety
operation mode switching operation
SAFETY MODE
TEST MODE
At the safety operation mode switching operation
(1) After switching from TEST MODE to SAFETY MODE, the safety operation
mode will be SAFETY MODE (wait-for-restart). (The status will be wait-for-
restart until the CPU module is powered off or is reset.) An error occurs if
the SIL2 Process CPU is switched to the RUN state when in SAFETY
MODE (wait-for-restart).
(2) After switching the safety operation mode (TEST MODE
SAFETY
MODE), the mode will switch to SAFETY MODE when the CPU module is
powered off and on or is reset.
(3) After switching the safety operation mode (SAFETY MODE
TEST
MODE), the mode will switch to TEST MODE.
(1)
(2)
(3)
Safety operation mode
The CPU module is
powered off or being
reset.
TEST MODE
SAFETY MODE
(wait-for-restart)
The CPU module is
powered off or being
reset.
SAFETY MODE
TEST MODE
User operation
Power-on/Reset of the CPU
module
Writing programs and parameters
to the CPU module
Mode switching (other than RUN)
(TEST MODE → SAFETY MODE)
Power-off/Reset of the CPU
module
Power-on/Reset of the CPU
module
Mode switching
(SAFETY MODE → TEST MODE)
Factory default
Summary of Contents for MELSEC iQ-R-R00CPU
Page 2: ......
Page 151: ...9 MONITOR FUNCTION 9 1 Real Time Monitor Function 149 9 MEMO ...
Page 323: ...18 SEQUENCE SCAN SYNCHRONIZATION SAMPLING FUNCTION 321 18 MEMO ...
Page 330: ...328 20 ROUTING SETTING 20 3 Precautions MEMO ...
Page 423: ...26 BASIC CONCEPT 26 8 State Transition of the Redundant System 421 26 MEMO ...
Page 1014: ...1012 APPX Appendix 15 Added and Enhanced Functions MEMO ...
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