6
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6.2 Safety CPU Operation Mode
6.2.1 Safety CPU operation mode
6
FUNCTIONS
(3) Safety CPU operation mode switching
Diagram 6.3 shows the state when the safety CPU operation mode is switched.
POINT
1. Safety CPU operation mode information is retained by the CPU module
battery.
When using the CPU module, connect the battery included in the CPU
module.
2. Programs cannot be executed in "SAFETY MODE (wait-for-restart)".
(Even if the RUN/STOP/RESET switch is operated STOP RUN or a remote
RUN is executed from GX Developer, the safety CPU module does not go into
the Run status.)
3. In the following cases, the unit starts up in TEST MODE
• The first power-on after the unit is purchased.
• When the safety CPU operation mode became unstable due to low
battery. (The operation contents "OP001:SYSTEM INITIALIZE
OPERATION MODE" are stored in the operation/error history.)
Diagram 6.3 State when the safety CPU operation mode is switched
Safety CPU operation mode switching
(SAFETY MODE to TEST MODE)
Safety CPU operation mode switching
(TEST MODE to SAFETY MODE)
Safety CPU operation mode switching
(SAFETY MODE (wait-for-restart) to
TEST MODE)
PLC power-on
CPU module reset
cancel
PLC power-on
CPU module reset
cancel
PLC power-on
CPU module reset
cancel
TEST MODE
SAFETY MODE
SAFETY MODE
SAFETY MODE
(wait-for-
restart)
At the factory
When safety CPU operation mode becomes
unstable due to low battery voltage.
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