KEYENCE LK-2000 Series - Manual (Page 16)

16
Alarm hold function
DIP switch 1
When DIP switch 1 is set to the upper position, the sensor does not
produce the 12 V (31.2 mA) analog output during alarm output (range
over/light quantity alarm), but retains the analog output value just prior to
alarm output. This function is canceled when measurement is again
possible.
When the DIP switch 1 is set to the lower position, the sensor produces
the 12 V (31.2 mA) analog output during alarm output.
Note: The alarm output is produced in the alarm condition even if the
alarm hold function is used.
FUNCTIONS DIP SWITCHES
The condition in which the measurement is
impossible can be ignored, eg. the detection of
holes in a target.
Key-lock function
DIP switch 2
When DIP switch 2 is set to the upper position, the sensor locks the shift
adjustment, span adjustment, ZERO RESET and RESET keys so that
each function cannot change. The shift (AUTO ZERO) and span values
are fixed just prior to the lock operation.
Use this function to prevent the output voltage from being acciden-
tally reset to zero.
When the DIP switch 2 is set to the lower position, the key-lock function
is set to FREE and the lock operation is canceled.
The AUTO ZERO input through the external input terminal is effective
regardless of the LOCK or FREE setting. (However, with the LOCK set,
the data will not be stored when the power is turned off.)
HOLD
12 V
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DIP Switch
Analog
output
Analog
output
DIP switch
(lower position)
(12 V)
DIP switch
(upper position)
(HOLD)
LK-031
LOCK
FREE
1 2 3