6 FUNCTIONAL SAFETY
6.4 Safety sub-function
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Status of I/O signals at startup and error detection
• At startup
After power-on, each output device constantly outputs the OFF signal until completion of the diagnosis. After the diagnosis is
completed, the devices assigned with [Pr. PSD08 Output device selection DO1] are output.
The diagnosis completion timing differs depending on whether safety sub-function control is by an input device or by a
network. For safety sub-function control by input device, refer to the following.
For safety sub-function control by network refer to the following.
Page 350 Safety sub-function control by network
• At error detection
When an error is detected in a servo amplifier and an alarm that disables SSM occurs, each output device turns off.
If some other type of alarm occurs, the output from the assigned devices will continue.
ON
OFF
ON
OFF
ON
OFF
ON
OFF
Power supply
STOS (STO output)
Diagnosis in progress
CN8-6 pin
CN8-7 pin