Mitsubishi Electric MELSEC Q Series Programming Manual page 35

1 OVERVIEW
(11) It is recommended that operation cycle of Motion CPU is set to 0.8ms or more for
safety observation function. If the operation cycle is set to shorter than 0.8ms, an
operation cycle over will occur.
(12) When safety observation function is enabled, the self-diagnostics of CPU module
is executed after power supply ON. Therefore, the time until CPU module
becomes RUN state is about 15 seconds longer than time without safety
observation function.
(13) Safety observation functions cannot be used in combination with the high-speed
universal model QnUDVCPU PLC CPU module.
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