Omron ZX Series - Key Lock Function

Through-beam Sensor Heads: FUN Mode Functions Section 3-8
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3-8-17 Key Lock Function
The keys can be disabled on the Amplifier Unit. Once the keys have been
disabled, no key input will be accepted until the lock is released.
Use this function to prevent inadvertent changes to settings.
Refer to 4-5-5 Key Lock.