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26 PAC8000* IO PROFINET Scanner User’s Manual–September 2017 GFK-2839B
2.9 PAC8000 PROFINET Scanner Power-up and Restart
Once PNS is powered up, the OK LED remains ON. If a fatal error occurs during powerup,
the LED blinks instead.
If the module encounters a hardware failure, invalid firmware image, or the powerup
diagnostics fail, the module will not become operational; it may enter firmware update mode.
Cycling power to the module should restore operation.
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