Lk-g-m-no3-e – KEYENCE LK-G Series User Manual

Page 86

3-28

LK-G-M-NO3-E

3 Function Settings

■

Peak hold/bottom hold/peak-to-peak hold/average hold

The values within the period of time (sampling period) determined by the external TIMING input are
measured, and the display and output are retained. The sampling period differs between Trigger 1 and 2.

•

For Trigger 1, the sampling period is between the rising edge of the TIMING input to the rising edge of the next TIMING
input. When the TIMING input turns ON, the measurement value in the sampling period immediately before
is outputted.
The RESET process is not performed when the TIMING input is turned on.

•

For Trigger 2, the sampling period is between the falling edge of the TIMING input to the rising edge of the next TIMING
input. When the TIMING input turns ON, the measurement value in the sampling period immediately before is output.
The RESET process of the internal measurement value is performed when the timing input is turned off.

• In the following cases, the comparator standby status (the display shows "

------

") is displayed until the

first measurement value is fixed. When the power is turned on/when a setting is changed/when a program
No. is changed/when RESET is inputted/when Auto-zero is inputted

• The comparator output is outputted according to the measurement value.
• The ON state of each output indicates the state where the NPN or PNP open-collector output is turned on.
• The ON state of each input indicates the state where it is short-circuited between the terminal and the COM

terminal for NPN type, and the voltage is applied between the terminal and the COM terminal for PNP type.

• The RS-232C output is synchronized with the timing input when "Auto transmission" in the Environment set-

ting is set other than OFF. (page 3-49)

• Refer to "Functions of the Input and Output Signals" (page 4-7) for details of binary output.
• If the TIMING input becomes ON during the RESET processing, the comparator standby status (the display

shows "

------

") is displayed.

• When the internal measurement value becomes the alarm state, the measurement result varies depending

on the settings of the alarm process.
With hold: The measurement result is outputted by using the value immediately before the retained value.
Without hold: The measurement value is outputted while ignoring the alarm state period at the time of peak
hold. When the whole sampling period is in the alarm state, the alarm (-FFFFFF) becomes the measure-
ment result. At the time of other than peak hold, the alarm (-FFFFFF) becomes the measurement result.

The TIMING input and RESET input can be controlled using the RS-232C (page 5-8).

• Set the average filter (the number of times for averaging) to 1 if the measurement mode is set to average hold.
• When the mode is set without the alarm hold, and a large value is set for the average number of

times, the measurement result may not trigger an alarm. Check the alarm output to ensure that the
alarm state is properly recognized.

Peak hold

Measures the maximum value within the specified period of time (sampling period).

Bottom hold

Measures the minimum value within the specified period of time (sampling period).

Peak-to-peak hold

Measures the differential value of the maximum and minimum values within the
specified period of time (sampling period).

Average hold

Measures the average value within the specified period of time (sampling period).

(e.g) Measurement value in peak-hold setting

Internal measurement value

Sampling

period

Sampling period

RESET
process

Comparator standby

(------ display)

Measurement value

Comparator

Measurement value

Comparator

OFF

TIMING input

OFF

RESET input

OFF

Comparator output

Binary output

RS-232C output

Trigger 1

Trigger 2

Sampling

period

Sampling period

Sampling

period

Sampling

period

Sampling period

--------

Reference

Note