KEYENCE LC-2400 User Manual

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Instruction Manual

Ultra High Accuracy Laser Displacement Meter

96M1119

LC-2400 Series

Safety Precautions

This manual describes how to install the LC-2400 Series as well as its operating procedures and precautions. Please read this manual carefully to get the best from your LC-2400 Series.

Symbols

General Precautions

The following symbols alert you to important messages. Be sure to read these messages carefully.

WARNING

CAUTION

Note

• At startup and during operation, be sure to monitor the functions and performance of the LC-2400 series.

• We recommend that you take substantial safety measures to avoid any damage in the event a problem occurs.

• Do not open or modify the LC-2400 series or use it in any way other than described in the specifications.

• When the LC-2400 series is used in combination with other instruments, functions and performance may be degraded, depending on operating conditions and the surrounding environment.

Failure to follow instructions may lead to injury. (electric shock, burn, etc.)

Failure to follow instructions may lead to product damage.

Provides additional information on proper operation.

CAUTION

• Do not use the LC-2400 series for the purpose of protecting the human body.

Turn the power OFF when connecting or disconnecting the sensor head connector, power supply cables, or any of the optional boards. Otherwise, the laser diode or other electronic components may become degraded or damaged.

Contents of the Package

The LC-2400 series includes the following items. Check that none of the items are missing or damaged.

● Display unit model: LC-D1A/LC-D1W (Qty: 1)

If the control unit was ordered separately, the display unit is not included.

● Control unit model: LC-C1A / LC-C1W/LC-C2(1)

If the display unit was ordered, the control unit is incorporated in the display unit.

● Sensor head

Check that the requested sensor head is included in the contents. model: LC-2420 model: LC-2440

LC-2430 LC-2450

● 3-m connecting cable (1)

1., 2.

● 2-m power cable (1)

Note

● Ferrite core ESD-SR-25 (TOKIN) for RS-232C cable (2)

● Ferrite core ZCAT3035-1330 (TDK) for CONTROL I/O cable (2)

● Power supply key (2) ● 24-pin control I/O connector (1)

● 4-pin laser remote grounding

● Instruction manual (1)

plug (1)

Inserting this plug into the LASER REMOTE connector on the rear panel

LC–2400 Series

enables laser emission. (See page 15.)

Instruction Manual

1. Depends on quantity ordered

2. 5-m or 10-m cable is also available. (To use a 5-m or 10-m cable with the LC-2400 series that has been calibrated for a 3-m cable the unit must be recalibrated by KEYENCE. We also offer the LC2400 series configured for 5-m and 10-m cables.)

3. Included with the LC-2400W series.

• The 5-m or 10-m cable is not available for the LC-2400W series.

• The LC-C1W cannot be used seperately from the display unit.

WARRANTIES AND DISCLAIMERS

Sea page 113.

Conventions The following symbols are used in this manual:

Failure to follow instructions may lead to injury.

WARNING

CAUTION

(electric shock, burn, etc.) Cautions against procedures which may result in

malfunctions or measurement errors as well as hazardous operating conditions. Be sure to read this information carefully.

Turn to this page for more detailed information on a given subject.

Note

Read here for more details or for reference information on a given subject. This information can be read as required.

LC-2400 operation keys.

iii

How to Use This Instruction Manual

This instruction manual is composed of 9 chapters. An introduction to each chapter is given below: Users who are using the LC-2400 series for the first time are encouraged to read through the entire instruction manual.

Chapter Guide

1. LASER SAFETY PRECAUTIONS

This chapter describes the safety precautions for dealing with the laser in the LC-2400 series.

2. SYSTEM CONFIGURATION

This chapter introduces the LC-2400 series measurement system. A "Quick Reference Table" is also included to help you quickly locate the information and procedures that you require.

3. PART NAMES AND FUNCTIONS

This chapter identifies parts used in the LC-2400 series.

4. OPERATING INSTRUCTIONS

This chapter explains in detail how to operate the LC controller. Please read and follow the instructions in this chapter carefully before operating the LC.

5. CONNECTIONS

This chapter explains the procedures for installing a sensor and connecting it to the LC controller.

6. SETTING UP

This chapter explains how to set the parameters quickly and easily for obtaining accurate measurements with the LC-2400 series. Read how to set the parameters in this chapter after checking the system setup against the table given in Chapter 2-4 "Quick Reference Table".

7. MEASUREMENT PROCEDURE

This chapter explains measurement procedures using various targets.

8. EXTERNAL I/O FUNCTIONS

This chapter explains how to communicate with external I/O devices such as a personal computer.

9. APPENDIX

The appendix includes a troubleshooting guide, a glossary, and a description of the expansion I/Os.

TABLE OF CONTENTS

CHAPTER 1 LASER SAFETY PRECAUTIONS 1

1-1 Classification...................................................................................2

1-2 Warning Label.................................................................................2

1-3 Label Location ................................................................................3

1-4 Safety Consideration ......................................................................3

1-5 Safety Features Provided with the LC-2400 Series........................4

CHAPTER 2 SYSTEM CONFIGURATION 5

2-1 Basic System Configuration............................................................6

2-2 Expansion System Configuration....................................................7

2-3 Sensor Head Types and Functions ................................................8

2-4 Quick Reference Table ...................................................................9

CHAPTER 3 PART NAMES AND FUNCTIONS 11

3-1 Controller ......................................................................................12

Front Panel ..............................................................................12

Rear Panel...............................................................................14

3-2 Sensor Head.................................................................................16

CHAPTER 4 OPERATING INSTRUCTIONS 17

4-1 Instructions for Using Controller and Sensor Head ......................18

After Receiving the LC-2400 Series ........................................18

Daily Maintenance Instructions................................................18

Replacing Battery ....................................................................19

Instructions for Sensor Setup ..................................................20

Hints on Correct Use ...............................................................10

CHAPTER 5 CONNECTIONS 21

5-1 Connecting Controller to Sensor Head .........................................22

5-2 Connecting Power Supply Cable ..................................................22

Connecting Controller to Sensor Head

When Using the Display Unit.................................................22

Connecting the Power Supply Unit

to a Separate Control Unit ....................................................23

5-3 Grounding Controller ....................................................................23

Grounding the Controller

When Using the Display Unit.................................................23

Grounding the Control Unit......................................................23

5-4 Installing LC-B3 Board (2CH Sensor Head Board).......................24

5-5 Installing GP-IB or DIGITAL I/O Board .........................................24

5-6 Adjusting Sensor Head Position ...................................................25

CHAPTER 6 SETTING UP 27

6-1 Basic Operation of Controller........................................................28

6-2 Selecting Measurement Mode ......................................................30

6-3 Calibrating Sensitivity (Gain Selection).........................................30

6-4 Selecting the Display/Output Mode ..............................................31

6-5 Correcting Measurement Error (Calibration).................................32

6-6 Offset Values ................................................................................35

6-7 Reducing Variation in Measurement Data

(Setting Number of Averaging Measurements) ..........................36

6-8 Reducing the Effect of Target Surface Irregularities

(Setting Low-pass Filter Value)...................................................36

6-9 Setting Range for Light Intensity (INT. LIMIT) ..............................37

6-10 Setting Upper/Lower Limits for Measurements

(Setting Tolerance) .....................................................................39

6-11 Setting Number of Digits Displayed ..............................................40

6-12 Storing and Loading Settings (Programming)...............................41

CHAPTER 7 MEASUREMENT PROCEDURE 43

7-1 Measuring with One Sensor Head................................................44

7-2 Measuring with Two Sensor Heads ..............................................45

CHAPTER 8 EXTERNAL INPUT/OUTPUT 49

8-1 RS-232C Interface ........................................................................50

8-2 Control I/O (Standard Equipment on Display Unit) .......................71

8-3 Analog Voltage Output (Standard Equipment) .............................73

8-4 Digital I/O (Standard Equipment on Control Unit).........................74

CHAPTER 9 APPENDIX 79

9-1 Trouble-Shooting Guide................................................................80

9-2 Hints on Highly Accurate Measurement .......................................83

9-3 Specifications................................................................................84

9-4 Dimensions ...................................................................................85

9-5 Characteristics ..............................................................................87

9-6 Initial Setting List...........................................................................89

9-7 Glossary........................................................................................90

9-8 Expansion I/O (Optional) ..............................................................94

9-9 Index ...........................................................................................111

WARRANTIES AND DISCLAIMERS 113

CHAPTER 1

LASER SAFETY PRECAUTIONS

1-1 Classification ................................................................... 2

1-2 Warning Labels ................................................................ 2

1-3 Label Location ................................................................. 3

1-4 Safety Consideration ....................................................... 3

1-5 Safety Features Provided with the LC-2400 Series ......... 4

1-1 Classification

AVOID EXPOSURE

LASER RADIATION IS EMITTED FROM THIS APERTURE.

1-2 Warning Labels

1-1 Classification

1-2 Warning Labels

The LC-2400 series employs a visible semiconductor laser as its light source classified as follows:

Model LC-2420 LC-2430 LC-2440 LC-2450

Class FDA (CDRH) Class II

IEC/EN 60825-1:1993+

A2: 2001

DIN EN 60825-1 2001 Klasse 2

Class 2

Warning Labels

1) Warning labels

FDA Class II

CAUTION

LASER RADIATIONDO NOT STARE INTO BEAM

SEMICONDUCTOR LASER 670nm MAXIMUM OUTPUT 1.9mW (AVERAGE OUT PUT 950µW) PULSE DURATION 10µSEC CLASS II LASER PRODUCT

IEC Class 2

IEC (French) Classe 2

AVOID EXPOSURE

LASER RADIATION IS EMITTED FROM THIS APERTURE.

AVOID EXPOSURE

LASER RADIATION IS EMITTED FROM THIS APERTURE.

AVOID EXPOSURE

LASER RADIATION IS EMITTED FROM THIS APERTURE.

CAUTION

LASER RADIATIONDO NOT STARE INTO BEAM

SEMICONDUCTOR LASER 670nm MAXIMUM OUTPUT 1.9mW (AVERAGE OUT PUT 950µW) PULSE DURATION 10µSEC CLASS II LASER PRODUCT

DIN Klasse 2

CHAPTER 1 Laser Safety Precautions

1-3 Label Location

LASER RADIATION IS EMITTED FROM THIS APERTURE.

CAUTION

LASER RADIATION IS EMITTED FROM THIS APERTURE.

CAUTION

LASER RADIATION IS EMITTED FROM THIS APERTURE.

CAUTION

FDA

• LC–2420/2430

1-3 Label Locations 1-4 Safety Consideration

FDA Warning labels are attached to the sensor head as shown below. The IEC/DIN Warning labels are packaged with the LC-2400 Series. Affix the Warning labels on the sensor head as shown below.

• LC–2440/2450

CAUTION

LASER RADIATIONDO NOT STARE INTO BEAM

SEMICONDUCTOR LASER 670nm MAXIMUM OUTPUT 1.9mW (AVERAGE OUT PUT 950µW) PULSE DURATION 10µSEC CLASS II LASER PRODUCT

IEC/DIN

• LC–2420/2430

LC–2420 LC–2420

AVOID EXPOSURE

LASER RADIATION IS EMITTED FROM THIS APERTURE.

AVOID EXPOSURE

LASER RADIATION IS EMITTED FROM THIS APERTURE.

CAUTION

LASER RADIATIONDO NOT STARE INTO BEAM

SEMICONDUCTOR LASER 670nm MAXIMUM OUTPUT 1.9mW (AVERAGE OUT PUT 950µW) PULSE DURATION 10µSEC CLASS II LASER PRODUCT

CAOTION-LASER RADIATION WHEN OPEN

DO NOT STARE INTO BEAM

Aperture Aperture

LC–2420 LC–2420

Aperture Aperture

CAUTION

LASER RADIATIONDO NOT STARE INTO BEAM

SEMICONDUCTOR LASER 670nm MAXIMUM OUTPUT 1.9mW (AVERAGE OUT PUT 950µW) PULSE DURATION 10µSEC CLASS II LASER PRODUCT

AVOID EXPOSURE

LASER RADIATION IS EMITTED FROM THIS APERTURE.

• LC–2440/2450

AVOID EXPOSURE

LASER RADIATION IS EMITTED FROM THIS APERTURE.

LC–2440LC–2440

CAUTION

LASER RADIATIONDO NOT STARE INTO BEAM

SEMICONDUCTOR LASER 670nm MAXIMUM OUTPUT 1.9mW (AVERAGE OUT PUT 950µW) PULSE DURATION 10µSEC CLASS II LASER PRODUCT

CAOTION-LASER RADIATION WHEN OPEN

DO NOT STARE INTO BEAM

LC–2440LC–2440

1-4 Safety Consideration

Use of controls or adjustments or the performance of procedures other than those specified herein may result in hazardous radiation exposure.

The laser beam is not harmful to the skin. There is, therefore, no danger in exposing arms or hands to the beam. The only possible health hazard is in exposing the eyes to the laser beam. Damage to the eyes can occur if the operator stares directly into the beam.

Follow the safety precautions below to ensure operator safety:

• Operate the LC-2400 series only according to the procedures described in this instruction manual.

Otherwise, injury may occur due to expose to the laser beam.

• Do not disassemble the sensor head.

Laser emission from the LC-2400 series is not automatically stopped if the sensor head is disassembled. If you disassemble the sensor head for inspection or repair, you may be exposed to the laser beam. If the LC-2400 series malfunctions, contact KEYENCE immediately.

• Do not look directly at the laser beam.

Looking directly at the laser beam may result in serious eye injury.

CAUTION

WARNING

CHAPTER 1 Laser Safety Precautions

1-5 Safety Features Provided with the LC-2400 Series

• Diffuse-reflective sensor head (LC-2440/LC-2450)

• Regular-reflective sensor head (LC-2420/LC-2430)

Open

• Protective enclosure

We recommend that you install a protective enclosure around the sensor head to prevent any person from getting near the sensor head during operation.

• Protective goggles

We recommend that you wear protective goggles when using the LC2400 series.

Note

The intense light from this laser can be harmful to the eyes during prolonged viewing. Normal reflex blinking is usually enough to prevent any eye damage. However, it is best to wear laser protective glasses whenever working around a sensor head.

1-5 Safety Features Provided with the LC-2400 Series

The LC-2400 series comes with the following safety features:

■ Laser ON alarm LED

Both the sensor head and the controller panel have a visible LED that lights when laser is ready to be and is being emitted.

Note

LEDs can be checked to see if they are lit even when you are wearing laser protective glasses.

Reference: Laser ON alarm LED (p.12, 14, 16)

■ Delay of laser beam emission

To prevent an operator from being exposed to the laser beam, the laser beam is emitted three seconds after the laser ON alarm LED lights.

■ Laser emission remote control input connector

The laser emission control connector is located on the rear panel of the control unit. The laser can be turned on or off by a remote control signal through this connector.

Reference: Laser Remote Grounding Connector (p.15)

■ Key-operated power switch

The controller power switch can be locked using the attached key. When the LC-2400 controller is OFF, the key can be removed.

■ Laser beam shield

The sensor head transmitter comes with a laser beam shield.

Precautions for parameter setup and measurements

If there is a danger of an operator looking into the laser beam when working in front of the sensor head, close the laser beam shield as shown below before starting operations. Close or open the laser beam shield as shown below:

CHAPTER 1 Laser Safety Precautions

CHAPTER 2

SYSTEM CONFIGURATION

2-1 Basic System Configuration ............................................ 6

2-2 Expansion System Configuration .................................... 7

2-3 Sensor Head Types and Functions ................................. 8

2-4 Quick Reference Table.................................................... 9

2-1 Basic System Configuration

The LC-2400 series is equipped with I/O ports for connecting to external equipment and a slot for installing an optional expansion board. By connecting personal computers or other devices to the LC-2400 series, measurement data obtained with the LC-2400 series can be used for various applications.

2-1 Basic System Configuration

The LC controller consists of a display unit and control unit. If required, the control unit can be used separately from the display unit. There are also two expansion slots; one for the optional LC-B3 board which, when installed, allows the use of a second sensor head and a second slot for either a DIGITAL I/O board or GP-IB board.

However, the LC-2400W series does not incorporate these expansion slots.

Display unit (model: LC-D1A/LC-D1W)

Control unit (model: LC-C1A/LC-C1W/LC-C2)

Expansion slot for DIGITAL I/O board* (model: LC-B1)

or GP-IB board*(model: LC-B2)

1., *2.

CHAPTER 2 System Configuration

Expansion slot for LC-B3 2CH sensor head board*

1., *2.

1CH sensor head port: for LC-2420/LC-2430/LC-2440/LC-2450

*1. Optionally available from KEYENCE *2. Cannot be used with the LC-2400W series.

2-2 Expansion System Configuration

For flexible expansion, a variety of external equipment can be connected to the LC-2400 series, as shown below.

2-2 Expansion System Configuration

Connect a PLC , photoelectric sensor , or proximity sensor . This port is used to switch memory banks, input auto-zero and hold signals, and output alarm signals.

With a commercially available printer connected, you can record measurement results.

*1.

2ch sensor head port

1ch sensor head port

Control I/O port

With the optionally available 2CH board (model: LC-B3), you can connect the second sensor head (model: LC-2420 /-2430/-2440/-2450) to the controller.

Connect the first sensor head (model: LC-2420 /-2430/-2440/-2450).

*1., *2.

RS-232C port

With the DIGITAL I/O board (model: LC-B1) or GP-IBboard (model: LC-B2), you can send data to and receive it from a personal computer.

You can send data to and receive it from a personal computer through one of the interface (RS-232C, DIGITAL I/O , GP-IB ).

*1. *1.

Expansion slot

Analog voltage output

*1., *2. *1., *2.

With an oscilloscope or pen recorder connected, you can monitor changes in light intensity and target displacement through analog voltage signals.

*1. Optionally available from KEYENCE *2. Cannot be used with the LC-2400W series.

CHAPTER 2 System Configuration

2-3 Sensor Head Types and Functions

The LC-2400 Series gives you a choice of 4 sensor head models.

LC-2420/LC-2430: Regular-reflective sensor heads

Regular-reflective sensor heads are used to measure targets having a highly reflective or mirror-like surface.

LC-2440/LC-2450: Diffuse-reflective sensor heads

Diffuse-reflective sensor heads are used to measure targets having a lowreflective or opaque surface.

CHAPTER 2 System Configuration

2-4 Quick Reference Table

Sensor setup, cable connections, and various parameters must be set before starting measurement. However, some of the parameters are not necessary, depending on system configuration and the type of measurements being done. The following table shows the procedures to follow, in sequential order, before starting measurement. Find the items pertaining to your setup in the table to determine which sections of the manual are required reading.

Type of measurement

Trial measurement Measuring height Measuring eccentricity Measuring thickness Measuring difference in height

Section No. Page No.

5-1 Connecting Controller to Sensor Head p.22 R R R R R 5-2 Connecting Power Supply Cable p.22 R R R R R 5-3 Grounding Controller p.23 R R R R R 5-4 Installing LC-B3 Board (2CH Sensor Head Board) p.24 R R 5-5 Installing GP-IB or DIGITAL I/O Board p.24 5-6 Adjusting Sensor Head Position p.25 R R R R R 6-1 Basic Operation of Controller p.28 R R R R 6-2 Selecting Measurement Mode p.30 R R R R R 6-3 Calibrating Sensitivity (Gain Selection) p.30 R R R R 6-4 Selecting the Display/Output Mode p.31 R R 6-5 Correcting Measurement Error (Calibration) p.32 R R R R 6-6 Offset Values p.35 O O O O 6-7 Reducing Variation in Measurement Data

(Setting Number of Averaging Measurements)

6-8 Reducing the Effect of Target Surface Irregularities

(Setting Low-pass Filter Value) 6-9 Setting Range for Light Intensity (INT. LIMIT) p.37 O O O O 6-10 Setting Upper/Lower Limits for Measurements

(Setting Tolerance) 6-12 Storing and Loading Settings (Programming) p.41 R R R R 7-1 Measuring with One Sensor Head p.44 R R 7-2 Measuring with Two Sensor Heads p.45 R R

p.36 R R R R

p.36 O O O O

p.39 O O O O

R: Required reading O: Optional reading

CHAPTER 2 System Configuration

CHAPTER 3

PART NAMES AND FUNCTIONS

3-1 Controller ....................................................................... 12

3-2 Sensor Head.................................................................. 16

3-1 Controller

mm µ m

3-1 Controller

Front Panel

OFF

POWER

Key-operated power switch

Display

HIGH

LOW

LASER ON

Display

AUTO 1 2 3 4

INT.

LIMIT OFFSET CAL

LIMIT

12345

Display unit

ANALOG

BAUD

DIGIT

RATIO

RATE

PROGRAM

LOCK

HIGH

LOW

LASER ON

Operation keys

LASER DISPLACEMENT METER

NORMAL P–P

1CH 2CH

GAIN

PRM

LOAD

SAVE

PROGRAM

2–HEAD

AVERAGE

FILTER

PEAK

ADD SUB

INTENSITY

LC-2400A

BOTTOM

ZERO

HOLD

LC-2400A

OFF

POWER

LC-2400W

STAND-BY

POWER

Reference: Refer to P.44.

AUTO 1 2 3 4

ANALOG

LIMIT OFFSET CAL

12345

INT. LIMIT

RATIO

BAUD RATE

DIGIT

PROGRAM

GAIN

PRM

LOCK

No. Name Function Ref. page

1 Display panel Displays measured values, preset values and error mes-

sages.

p.82

2 GAIN LEDs Indicates the receiver sensitivity. One of the four LEDs

corresponding to the current sensitivity will be lit. When the receiver sensitivity is set to AUTO, one of the four

p.30

LEDs and the AUTO LED will be lit.

3 PARAMETER LEDs Lights when setting parameters such as upper/lower toler-

ance limits, offset, calibration, intensity limit, analog ratio, baud rate and display digit. The LED corresponding to the

p.28

parameter currently being changed lights.

4 PROGRAM LEDs The LED corresponding to the selected program number will

be lit. The LEDs blink during program selection.

5 PANEL LOCK LED Lights when the operation keys are disabled. 6 Laser ON alarm LED Lights when the laser beam is ready to be and is being

emitted from the sensor head.

7 LOW LED Lights when a measured value falls below the preset lower

limit in each measurement mode.

8 GO LED Lights when a measured value is within the preset tolerance

range of that measurement mode.

9 HIGH LED Lights when a measured value exceeds the preset upper limit

of that measurement mode.

p.41

p.55

p.4., 26

p.39

CHAPTER 3 Part Names and Functions

Operation Keys

3-1 Controller

NORMAL P–P

GAIN

PRM

LOAD

SAVE

PROGRAM

1CH 2CH

2–HEAD

AVERAGE

FILTER

PEAK

ADD SUB

INTENSITY

BOTTOM

ZERO

HOLD

No. Name Function Ref. page

0 NORMAL key Press this key to measure targets in the NORMAL mode. p.30 A P-P key Press this key to measure targets in the Peak-to-Peak mode. p.30 B 2CH key Press this key to measure targets with the second sensor

head (2CH slot) when two sensor heads are connected.

p.31, 45

C PEAK key Press this key to measure target in the PEAK mode. p.30 D BOTTOM key Press this key to measure target in the BOTTOM mode. p.30 E ADD key Press this key to measure thickness using two sensor heads. p.31, 46 F SUB key Press this key to measure height deviation using two sensor

heads.

p.31, 47

G FILTER key Press this key to set a (Low-pass) FILTER value. p.36 H ZERO key Press this key to reset a measured value to "0". p.29 I INTENSITY key Press this key to display received laser beam intensity. p.29 J HOLD key Press this key to hold a measured value. p.29 K ENTER key. Press this key to enter the value you set. p.28 L Numeral change keys Press this key to change values. Press or to shift

digits and press or to increase or decrease values as

p.28

well as change signs.

M SAVE key Press this key to save a measured value. p.41 N LOAD key Press this key to load stored parameter settings. p.41 O PRM key Press this key to change parameter settings. p.28 P AVERAGE key Press this key to set the number of averaging measure-

ments.

p.36

Q GAIN key Press this key to change receiver sensitivity. p.30 R 1CH key Press this key to use the first sensor head (1CH port) when

two sensor heads are connected.

p.31,44

CHAPTER 3 Part Names and Functions

3-1 Controller

Rear Panel

Display unit

Control unit

CONTROL I/O

HEAD No.

INTENSITY

RS-232C

MONITOR

DISPLACEMENT

BATTERY LASER ON LASER

LC–C1

]

HEAD No.

REMOTE

[

100~240V AC

FUSE 3.15A

POWER

OFF

No. Name Function Ref. page

S CONTROL I/O port Inputs signals (program, hold on/off, auto-zero on/off, etc.)

from and outputs signals to external equipment.

T INTENSITY output connector Outputs the laser beam intensity measured with the LC in

analog voltage.

U DISPLACEMENT output Outputs the measured displacement value as an analog

connector voltage.

p.71

p.74

p.73

V Expansion I/O slot Install GP-IB board* or digital I/O board* in this slot. p.24, 95 W 1CH sensor head connector Connect the 1CH sensor head to this connector. p.22 X Ventilating fan Radiates heat from the controller. p.16 Y Power supply connector Connect the power supply cable to this connector. p.22 Z F.G. terminal Ground the controller through this terminal. p.23 [ LASER REMOTE connector The LASER REMOTE connector is used to control laser

emission by an external input signal. When this connector is not used, be sure to connect the attached laser remote

p.11

grounding plug to this connector.

\ Laser ON alarm LED Lights when a laser beam is ready to be and is being

emitted from the sensor head.

p.18, 26

] BATTERY LED Lights when the internal backup battery is exhausted. p.15 ^ RS-232C I/O port Connect a personal computer or other device to this port

to externally control the LC.

p.50

a LC-B3 board slot Install the optional LC-B3 board in this slot. p.24

The LC-B3 cannot be used with the LC-2400W series.

b Power switch Use this switch to turn the main power supply on or off.

(LC-2400W only)

* Optionally available

CHAPTER 3 Part Names and Functions

3-1 Controller

DIGITAL I / O

DC DC DC

+15V –15V +5V0V 0V

Control unit

Laser Remote Grounding Plug

Note

Follow the instructions below to insert this plug into the LASER REMOTE connector.

1. Check the connector’s orientation before insertion.

LASER REMOTE connector

Laser remote grounding plug

2. Turn the stopper clockwise to lock it in place.

Stopper

Laser emission is enabled when pins 1 and 2 of the connector are shorted.

Control Unit Face

No. Name Function Ref. page

b 96-pin DIGITAL I/O port The control unit is connected to the display unit via this

connector. Digital signals are output through this connector when the control unit is used separately from the display unit.

c Earth ground terminal Ground the control unit through this terminal when using

the control unit separately from the display unit.

d Power supply terminals Connect the power supply cable to these terminals when

using the control unit separately from the display unit.

p.74

p.23

CHAPTER 3 Part Names and Functions

3-2 Sensor Head

LC-2420/2430 (Regular-reflective)

ef g

LC-2440/2450 (Diffuse-reflective)

feg

No. Name Function Ref. page

e Laser beam shield The laser beam shield is used to cover the laser beam

transmitter. When operators are working near the sensor head, if there is a risk of looking directly at the laser beam, be sure to cover the transmitter with the shield.

f Transmitter Emits laser beams. p.18 g Receiver Receives the reflected laser beam. p.18 h Cable connector Connects the sensor head cable to the controller. p.22 i Laser ON alarm LED Lights when a laser beam is ready to be and is being

emitted from the sensor head.

p.4

p.4, 26

CHAPTER 3 Part Names and Functions

CHAPTER 4

OPERATING INSTRUCTIONS

4-1 Instructions for Using Controller and Sensor Head............. 18

4-1 Instructions for Using Controller and Sensor Head

Before operating the LC-2400 series, read the following instructions carefully. If you encounter any problems, please contact us.

4-1 Instructions for Using Controller and Sensor Head

After Receiving the LC-2400 Series

Daily Maintenance Instructions

• After receiving the LC, check the contents to see if any items were damaged during transportation.

• Check that all the items were included.

Reference: Contents of the Package (p.ii)

• Before using the LC, be sure to read this instruction manual for details on the correct use of this product.

• Do not try to disassemble the LC or use a disassembled unit. Do not disassemble the sensor head in particular, since all of the sensor head parts have been factory-calibrated.

• Please handle the controller and sensor head with care. The precision optical components in the sensor head are especially susceptible to shock.

• The receiver and transmitter lenses are the critical components for accurate measurement. Any flaw or dust on the lenses may result in measurement errors. If dust has accumulated on the transmitter and receiver lenses, clean the lens surface by following the procedures given below.

1. Blow the dust off the receiver and transmitter lenses using a manual blower.

2. If dust persists, wipe the lens surface gently using a cotton swab dipped in alcohol.

CHAPTER 4 Operating Instructions

4-1 Instructions for Using Controller and Sensor Head

Replacing Battery

WARNING

CAUTION

The LC controller has an internal backup battery for storing parameter settings. The expected battery life is 1 to 2.5 years. When the battery is exhausted, the BATTERY LED lights. When this LED is lit, replace the battery by following the procedure given below.

Danger of explosion if battery is incorrectly replaced. Replace only with the same or equivalent type recommended by the manufacturer. Dispose of used batteries according to the manufacturer's instructions.

Turn the power OFF and unplug the power cable from the wall outlet.

1. Remove the two screws from the back of the display unit and remove the control unit.

Upper cover

Expansion slot

Control unit

Screws

2. Turn the control unit upside down, remove the six cover screws from the cover and then remove the cover. Locate the battery holder in the control unit.

Screws

Cover

Battery holder

Screws

3. Remove the battery from the battery holder.

Positive side

Flat lithium battery: CR2032

Internal backup battery Battery holder

4. Install the new battery in the battery holder with the positive side facing up. When installing a new battery, be sure that the polarity of the battery is correct.

CHAPTER 4 Operating Instructions

4-1 Instructions for Using Controller and Sensor Head

5. Put the cover back on the control unit and secure it with the six cover screws.

6. Reinsert the control unit into the display unit with the top of the control unit facing up, and secure the control unit with the two retaining screws.

Instructions for Sensor Setup

CAUTION

• Place the LC in a location that meets the following requirements: Temperature: 0 to 40°C Humidity: 35 to 85% RH (No condensation) Placing the LC in a location that does not meet these requirements may cause the controller and sensor head to malfunction.

Do not operate the LC in a location where extreme temperature variations are expected.

• Do not operate the LC where volatile flammable objects or corrosive gases are present.

• Do not expose the LC to extremely high humidity or water splashes.

• When using the control unit separately from the display unit, be sure to provide a protective cover for the control unit during operation.

• To prevent noise, keep the connection cables separate from the power cables. If this is not possible, shield or ground the connection cables.

Hints on Correct Use

• Insulate the sensor head if noise is transferred through the sensor head.

• Do not block the ventilation port or the ventilation fan of the controller. If they are blocked, the controller may overheat, resulting in a malfunction. Note also that a ventilation fan is not provided with the control unit. When using the control unit separately from the display unit, make sure that the room is sufficiently ventilated.

Ventilation port

Ventilation fan

• Keep the ambient temperature at a constant level during measurement.

• If the sensor head is operating in a location where there is thick fog or hot air, measurement errors may result.

• Be sure to leave the power on for at least 60 minutes before starting measurements.

CHAPTER 4 Operating Instructions

CHAPTER 5

CONNECTIONS

5-1 Connecting Controller to Sensor Head.......................... 22

5-2 Connecting Power Supply Cable................................... 22

5-3 Grounding Controller ..................................................... 23

5-4 Installing LC-B3 Board (2CH Sensor Head Board) ....... 24

5-5 Installing GP-IB or DIGITAL I/O Board .......................... 24

5-6 Adjusting Sensor Head Position .................................... 25

5-1 Connecting Controller to Sensor Head 5-2 Connecting Power Supply Cable

5-1 Connecting Controller to Sensor Head

The 2CH sensor head cannot be used with the LC-2400W series.

CAUTION

Connect the controller to the sensor head using the supplied connecting cable. At this time, make sure that the control unit and sensor head have the same serial number.

Options

Connecting cable

Sensor heads

2CH sensor head 1CH sensor head

If you purchase the LC-B3 and sensor head later, you can connect them to the controller without adjustment because the sensor head and the LC-B3 have been factory-calibrated as a pair.

5-2 Connecting Power Supply Cable

Connecting the Power Supply Cable When Using the Display Unit

Turn OFF the LC controller before starting the following procedure.

CAUTION

Plug the power supply cable into the power supply socket located on the rear of the display unit, and then into a wall outlet.

Power must be 100 to 240 VAC (50/60 Hz).

CHAPTER 5 Connections

Connecting the Power

;

Supply Unit to a Separate Control Unit

5-2 Connecting Power Supply Cable 5-3 Grounding Controller

Cannot be used with the LC-2400W series.

CAUTION

Turn OFF the power supply unit before starting the following procedure.

Connect the power supply unit to the power supply terminals located on the front of the control unit.

Note that the control unit uses the following types of power:

• ±15 VDC (±3%), 0.5A

• ±5 VDC (±5%), 3A, ripple (p-p): 100 mV max.

Be sure to supply Supplying only +5 VDC may cause a malfunction.

5-3 Grounding Controller

The controller can be grounded either by connecting the earth ground terminal located on the rear of the display unit to a grounding electrode or by connecting the ground wire of the power supply cable to the ground screw of a wall outlet. To prevent any risk of malfunction, ground the LC both ways as shown below.

DC DC DC

+15V –15V +5V0V 0V

±15 VDC and +5 VDC at the same time.

CAUTION

Grounding the Controller When Using the Display Unit

Grounding the Control Unit

Be sure to ground the controller separately from other devices.

Earth-ground the controller through the earth ground terminal located on the rear of the display unit with the ground wire of the power supply cable.

Cannot be used with the LC-2400W series.

Earth-ground the control unit through the earth ground terminal located on the front of this unit.

DC DC DC

+15V –15V +5V0V 0V

CHAPTER 5 Connections

5-4 Installing LC-B3 Board (2CH Sensor Head Board) 5-5 Installing GP-IB or Digital I/O Board

5-4 Installing LC-B3 Board (2CH Sensor Head Board)

Cannot be used with the LC-2400W series.

To use two sensor heads with the LC controller, the LC-B3 board must be inserted into the LC-B3 board slot located at the rear of the control unit. (The LC-B3 board is optional. Contact KEYENCE for details.)

CAUTION

Turn OFF the LC and unplug the power cable from the wall outlet before starting the following procedure.

1. Remove the two screws securing the LC-B3 board slot cover on the rear of the control unit.

2. Align the LC-B3 board with the grooves of the LC-B3 board slot, insert the LC-B3 board all the way into the slot, and secure the board using the two screws removed in step (1).

4-5 Installing GP-IB or Digital I/O Board (Options)

Cannot be used with the LC-2400W series.

CAUTION

Turn OFF the controller and unplug the power cable from the wall outlet.

Insert the GP-IB or Digital I/O Board into the expansion slot on the display unit as shown in the following figure. (See chapter 9.)

1. Remove the two screws securing the expansion slot cover at the rear of the display unit.

CHAPTER 5 Connections

2. Align the board with the grooves of the expansion slot, insert the GP-IB or DIGITAL I/O board all the way into the slot, and secure the board using the two screws removed in step (1).

5-6 Adjusting Sensor Head Position

1. Align the sensor head using the following three positions as alignment points: (1) The three mounting holes on each side of the sensor head (2) The sides of the sensor head (3) The front (laser-emitting surface) of the sensor head

5-5 Installing GP-IB or Digital I/O Board 5-6 Adjusting Sensor Head Position

Rear view of the controllerExpansion slot cover

(1)

(2) (2)

(3)

Right angle

LC±2420

LC±2440

Parallel

TargetTarget

(1)

(3)

Right angle

When there is a significant change in target color, material, or height, measurement errors may result depending on the orientation of the sensor head. Proper orientation is shown below.

Protrusion

Incorrect Correct Incorrect Correct

Recess

Color change

Rotating shaft

CHAPTER 5 Connections

Rotating shaft

5-6 Adjusting Sensor Head Position

2. Turn on the LC controller and adjust the sensor head position so that the laser ON alarm LED located on the sensor head lights orange. The sensor head is at the "reference distance" from the target when the above LED lights orange.

Checking for Reference Distance

When the distance between the target and sensor head is within the reference distance range, the laser ON alarm LED lights orange. The sensor head can be easily positioned even when the control unit is used without the display unit.

Laser ON alarm LED

NEAR FAR

Green Orange Green

Measuring range

Reference distance

Sensor head Range the LED lights orange

LC-2420 ±0.02 mm LC-2430 ±0.05 mm LC-2440 ±0.3 mm LC-2450 ±0.8 mm

CHAPTER 5 Connections

CHAPTER 6

SETTING UP

6-1 Basic Operation of Controller ........................................ 28

6-2 Selecting Measurement Mode....................................... 30

6-3 Calibrating Sensitivity (Gain Selection) ......................... 30

6-4 Selecting Display/Output Mode ..................................... 31

6-5 Correcting Measurement Error (Calibration) ................. 32

6-6 Offset Values ................................................................. 35

6-7 Reducing Variation in Measurement Data

(Setting Number of Averaging Measurements) ............. 36

6-8 Reducing Effect of Target Surface Irregularities

(Setting Low-pass Filter Value) ..................................... 36

6-9 Setting Range for Light Intensity (INT. LIMIT) ............... 37

6-10 Setting Upper/Lower Limits for Measurements

(Setting Tolerance) ........................................................ 39

6-11 Setting Number of Displayed Digits............................... 40

6-12 Storing and Loading Settings (Programming) ............... 41

6-1 Basic Operation of Controller

PRM

PRM PRM PRM PRM PRM PRM

LIMIT OFF SET CAL

INT.

LIMIT

ANALOG

RATIO

BAUD

RATE

DIGIT

PRM

6-1 Basic Operation of Controller

This section describes the basic operation procedures of the controller.

Selecting a Parameter

PRM

(

key)

Entering Numerical Values ( , , , and keys)

1. Press the

PRM

key. One of the PARAMETER LEDs lights, and the current value for the parameter appears on the display panel. The LC is now in the setting mode.

2. Press the

PRM

key repeatedly. The PARAMETER LEDs go on and off one after another as shown below. The illuminated LED means that the corresponding parameter is selected.

1. Select the desired parameter. The LC is ready to accept a numerical value.

2. Select a digit. Press the key. The selected digit starts flashing. Press the key to shift the selection to the right, and press the key to shift it to the left.

CHAPTER 6 Setting Up

to the left to the right

3. Change the digit. Press the or key while the digit is flashing. Press the key to increase the value. Press the key to decrease it.

234567 981

4. Confirm the setting. Press the key to confirm the new setting.

6-1 Basic Operation of Controller

Displaying Light Intensity

INTENSITY

(

key)

Automatic Zero Function (

ZERO

key)

Note

A function is available to display the intensity of reflected light from the target. The light intensity is displayed and output within a range of 1 to

50000. If possible, the target should have a light intensity of 00050 or greater for accurate displacement measurement.

1. Position a target for measurement.

2. Press the The LED above the

INTENSITY

key.

INTENSITY

key lights, and the light intensity appears on

the display panel.

An analog voltage equivalent to the light intensity is always output.

3. Press the The LED above the

INTENSITY

key again.

INTENSITY

key goes off, and the system will return to the

measuring mode.

This function sets the current measurement and displayed values to +0.0000 mm in the NORMAL, BOTTOM, or PEAK mode. After the function is executed, the LC will display and output displacement relative to the new reference (zero) point.

Hold Function

HOLD

(

key)

Note

1. Execute the automatic zero function. Press the The LED above the

ZERO

key.

ZERO

key lights and the displayed value turns to +0.0000 mm. Now the display will show the displacement relative to the new reference point.

2. Cancel the automatic zero setting function. Press the

ZERO

key again. The display restores the value before the automatic zero function was executed.

• This function can be operated even when the ADD or SUB key is used.

• The automatic zero function can also be operated via the CONTROL

I/O port.

The hold function is used to retain and output the last measured value. This function enables reading and recording of a specific analog value at a given moment.

1 Press the

The LED above the

HOLD

key.

HOLD

key lights and the last measured value is

displayed as well as output.

2 Press the

HOLD

key again. The hold function is deactivated and the LC-2400 series returns to the measurement mode.

CHAPTER 6 Setting Up

6-2 Selecting Measurement Mode 6-3 Calibrating Sensitivity (Gain Selection)

Note

The HOLD function can also be operated via the CONTROL I/O port.

Activating or deactivating the hold function in the P-P, PEAK, or BOTTOM mode will cause the LC to return to the measurement mode and reset the measurements.

6-2 Selecting Measurement Mode

Four measurement modes are available. Measurements from each mode can be displayed as well as output to external equipment.

Measurement mode Function

NORMAL Measures displacement from reference point

P-P Measures displacement between maximum and

(Peak-to-Peak) minimum values

PEAK Measures maximum value from reference point

BOTTOM Measures minimum value from reference point

Factory setting: NORMAL Press the mode selector key ( The LED of the selected mode lights, confirming that the controller is now in that measurement mode. Note that the measurements in any of the P-P, PEAK, or BOTTOM mode can be reset by pressing the same mode selector key again.

NORMAL

P–P

PEAK

, or

BOTTOM

key).

NORMAL P±P PEAK BOTTOM

Note

The measurements can also be reset by pressing

6-3 Calibrating Sensitivity (Gain Selection)

Light sensitivity of the sensor head can be adjusted through gain selection. The LC calculates a measurement based on the intensity of reflected light from the target. Because the light intensity varies with the reflectance of the target surface, the sensitivity of the sensor head must be optimized accordingly. The system offers four levels of sensitivity, which can be identified by the GAIN LEDs on the display unit. The correlation between the GAIN LEDs and light sensitivity of the sensor head is as shown below.

1234

AUTO

Reflectance of target

High Low

GAIN

HOLD

twice.

CHAPTER 6 Setting Up

Factory setting: AUTO

Reference: Displaying Light Intensity (P. 29)

6-3 Calibrating Sensitivity (Gain Selection) 6-4 Selecting the Display/Output Mode

1 Press the

GAIN

key. The AUTO LED and one of the four GAIN LEDs will light. When measurements are performed with these two LEDs on, the sensitivity will change automatically according to the light intensity received.

12 34

AUTO

GAIN

key again to select the lit LED.

Note

2 Press the For a target whose reflectance varies greatly, the AUTO function can be

selected. However, the measurement may show some variation when sensitivity is changed.

6-4 Selecting Display/Output Mode

The 2CH mode cannot be used with the LC-2400W series.

Any of the following modes can be selected when two sensor heads are used during measurements.

Mode Function

1 CH Displays/outputs the 1CH measurement. 2 CH Displays/outputs the 2CH measurement.

ADD Adds the 1CH and 2CH measurements and displays/

outputs the negative of this result. – (l 1 + l 2)

SUB Subtracts the 2CH measurement from the 1CH meas-

urement. (l 1 – l 2)

GAIN

Factory setting: 1CH

• Measurement example in the ADD mode

Thickness

• Measurement example in the SUB mode

1CH head

l 1

1CH head

2CH head

Height difference

l 2

CONTROL I/O

RS-232C

MONITOR

INTENSITY

DISPLACEMENT

MONITOR

INTENSITY

DISPLACEMENT

BATTERY LASER ON LASER

HEAD No.

BATTERY LASER ON LASER

LC±C1

HEAD No.

REMOTE

100~240V AC

F.G.

FUSE 3.15A

100~240V AC

F.G.

FUSE 3.15A

CHAPTER 6 Setting Up

6-4 Selecting Display/Output Mode 6-5 Correcting Measurement Error (Calibration)

• Only one of the four modes can be selected at a time.

• None of these modes can be selected when only one sensor head is

• In the ADD or SUB mode the 1CH intensity is displayed/output.

used.

To enter any of the above modes, press the desired key (

ADD

, or

SUB

key) and the LED above the key pressed will light.

6-5 Correcting Measurement Error (Calibration)

Calibrating the LC corrects the difference between the actual displacement and that measured by the LC. Always calibrate the LC after having moved the sensor head or having changed over the target types. There are two ways to calibrate the LC; calibration with a target (target positioning), and calibration without a target (entering a numerical value). Calibrate the LC using one of these methods. If frequent product changeover occurs, it is useful to record the calibration value for each product after calibration. The LC can then be re-calibrated simply by entering the calibration value recorded.

Factory settings: LC-2420: 200.00 µm LC-2430: 500.00 µm

LC-2440: 3.0000 mm LC-2450: 8.0000 mm

Calibration by Target Position

The LC is calibrated based on measurements of the target position. 1 Position the target within the measuring range.

1CH

2CH

Sensor head

Measuring range

2 Press the 3 Press the

NORMAL

PRM

key. The LED above the key will light.

key repeatedly until the CAL LED lights.

Target Actual displacement range

The LED lights and the LC continues to measure.

INT.

LIMIT OFFSET

CAL

LIMIT

ANALOG

RATIO

BAUD RATE

DIGIT

PRM

CHAPTER 6 Setting Up

6-5 Correcting Measurement Error (Calibration)

4 Shift the target to either end of the actual displacement range (closest or

farthest from the sensor head).

Sensor head

Shift the target to either end

Actual displacement range

Measuring range

• Be careful not to position the target outside of the measuring range.

• Instead of the target, the sensor head may be shifted during calibration.

5. Press the

ZERO

key. The displayed value changes to zero.

6. Shift the target to the other end of the displacement range. Again, the sensor head may be shifted instead of the target.

Shift the target to the other end of the displacement range.

Shift the target to the other end of the displacement range

Note

Be careful not to position the target outside of the measuring range.

7 Press the key.

The digits on the display start flashing and the LC switches to the calibration mode.

During calibration, pressing the

PRM

key, then the key will cancel calibration. When the calibration mode is canceled, the LC will return to the measurement mode.

8 Change the value on the display panel to the actual distance the target

was moved.

Reference: Entering Numerical Values (P.28)

9 Press the key.

Calibration is complete. The LC returns to the measuring mode.

CHAPTER 6 Setting Up

6-5 Correcting Measurement Error (Calibration)

Note

• Calibrate the LC by shifting the target only within the measuring range.

• If the calibration measurement is unacceptable, the error message "C-Err" (Calibration Error) appears on the display when the key is pressed. If this occurs, repeat the calibration.

Note

The calibration range is as follows:

Value to be entered in step 8

Calibration by Entering a Numerical Value

0.9 ≤ Measurement obtained with factory settings

The LC can be calibrated simply by entering previously recorded calibration values.

≤ 1.1

Check and record the calibration values by following the procedures shown below. The LC can then be calibrated simply by entering this value.

Checking Calibration Value Check the calibration value obtained from the calibration procedure using a

target.

1. Calibrate the LC using a target.

Note

Reference: Calibration by Target Position (P.32)

2. To interrupt the laser beam, close the laser beam shield or insert a lightshielding object at the closest possible position to the sensor head, between the sensor head and target. The message "dar" appears on the display panel.

When interrupting the laser beam, be careful not to touch the glass window of the sensor head.

3. Press the

LIMIT OFFSET

PRM

key repeatedly until the CAL LED lights.

INT.

CAL

LIMIT

ANALOG

RATIO

BAUD RATE

DIGIT

PRM

4. Press the key. The LC is ready to accept a new calibration value, and the calibration value appears on the display. Record the value.

5. Press the key again. The LC returns to the measuring mode.

CHAPTER 6 Setting Up

6-5 Correcting Measurement Error (Calibration) 6-6 Offset Values

Entering Calibration Value Enter the calibration value by following the procedures shown below.

1. Follow the same procedures used for checking the calibration value.

2. Change the displayed value to the recorded calibration value.

Reference: Entering Numerical Values (P.28)

Note

6-6 Offset Values

Press the

PRM

key first, then the key as many times as required to return to the measuring mode. The entered value and calibration mode are canceled.

3 Press the key.

Calibration is complete. The LC returns to the measuring mode.

To calibrate the LC through the RS-232C interface, enter the following calibration coefficient:

Calibration coefficient =

Desired preset value Factory setting value

Offset values are added to or subtracted from a measurement before displaying or outputting it. Offset values are used for displaying or outputting the target height or thickness as an absolute value. This function is also used to tune the LC to the input requirements of the equipment that is connected to it. The maximum and minimum offset values available depend on the sensor head as shown below.

Sensor head Offset value range Max. output range

LC-2420 +199.99 µm ±327.66 µm LC-2430 +499.98 µm ±655.32 µm LC-2440 +2.9998 mm ±6.5532 mm LC-2450 +7.9995 mm ±16.3830 mm

Note

Factory setting: 0

If a displayed value with a offset becomes beyond the maximum output range is specified, "- - - - -" will appear.

1. Press the

PRM

key repeatedly until the OFFSET LED lights. The current offset value appears on the display panel and the LC is ready to accept a new offset value.

LIMIT OFFSET

CAL

LIMIT

ANALOG

RATIO

BAUD RATE

DIGIT

PRM

INT.

2. Enter an offset value. To cancel entry of the offset value, press the

PRM

key first, then the key as many times as required to return to the measuring mode. The entered value and offset mode are canceled.

CHAPTER 6 Setting Up

6-7 Reducing Variation in Measurement Data (Setting Number of Averaging Measurements) 6-8 Reducing the Effect of Target Surface Irregularities (Setting Low-pass Filter Value)

(Setting Low-pass Filter Value)

3. Press the key. The offset value is stored, and the LC will returns the measurement mode.

6-7 Reducing Variation in Measurement Data

(Setting Number of Averaging Measurements)

The LC has a function for creating an average measurement value from a series of measurements. The more variation occurring in measurements, the higher the number of measurements should be taken in order to attain a stable, average measurement. The number of measurements can be selected from 18 different settings ranging from 1 to 131072.

This averaging function and the filtering function explained in Section 6-8 cannot be used at the same time.

Factory setting: 2048

Reference: Number of averaging measurements vs. response frequency (P.83)

Averaging method (P.91)

AVERAGE

key.

AVERAGE

key lights, and the current number of averag-

AVERAGE

key remains lit during

Note

1. Press the The LED above the ing measurements appears on the display panel.

2. Press the or key to change the value. Every time the key is pressed, the number of measurements increases or decreases to twice or

half the original value (1, 2, 4, 8, 16, 32, 64, 128 ..... 131072).

To cancel entry of the number of measurements, press mode is canceled and the LC returns to the measuring mode.

3. Press the key. The number of measurements chosen is set, and the LC returns to the measuring mode. The LED above the measurements.

6-8 Reducing Effect of Target Surface Irregularities

(Setting Low-pass Filter Value)

AVERAGE

key. This

CHAPTER 6 Setting Up

A low-pass filter is used to attenuate measurements at frequencies higher than the preset limit. The preset frequency is referred to as the cutoff frequency. This is useful for targets with treated surfaces (e.g. hairline finish). When measuring these targets, the sensor detects surface irregularities (picks up noise), preventing accurate measurement. By setting a filter value, the LC can more accurately measure the displacement of the target without distortion from the texture of the target surface.

Factory setting: FILTER OFF, cutoff frequency: 100

6-8 Reducing Effect of Target Surface Irregularities (Setting Low-pass Filter Value) 6-9 Setting Range for Light Intensity (INT. LIMIT)

• A digital low-pass filter is used.

• The filtering function cannot be used when using the control unit independently.

• This function and the averaging function explained in the previous section cannot be used at the same time.

1. Press the

FILTER

key. The LED above the key flashes and the current cutoff frequency appears on the display.

2. Set the cutoff frequency The cutoff frequency can be set between 0100 and 4999 Hz.

Note

If this frequency is set below 0100, the error message "f-Err" appears.

Note

To cancel entry of the cutoff frequency, press the canceled, and the LC returns to the measuring mode.

3. Press the key. The new cutoff frequency is set, and the LC returns to the measuring mode. The LED above the

FILTER

key remains lit during measurements.

6-9 Setting Range for Light Intensity (INT. LIMIT)

The range for light intensity can be set. The upper/lower limits are referred to as the "HIGH-INTENSITY LIMIT" and "LOW-INTENSITY LIMIT", respectively. Also, the measurement of displacement just before the light intensity exceeds the HIGH-INTENSITY LIMIT or falls below the LOW-INTENSITY LIMIT can be retained. The duration to retain the measurement is referred to as a "level-cut time". This can eliminate inaccurate measurements resulting from sudden changes in the light intensity or presence of dents or grooves on the target surface.

FILTER

key. The setting is

Factory settings: LOW-INTENSITY LIMIT: 50 (selectable between 00000 and 49998) HIGH-INTENSITY LIMIT: 49750 (selectable between 00000 and 49998) Level-cut time: 0000.0 ms (selectable between 0000.0 and 2999.9 ms or

9999.9 [infinity])

• A level-cut time must be set each for the LOW-INTENSITY LIMIT and

HIGH-INTENSITY LIMIT.

• The HIGH-INTENSITY LIMIT must be greater than the LOW-INTEN-

SITY LIMIT.

1. Measure the light intensity of the irregular portion of the surface and record the value.

Reference: Displaying Light Intensity (P.29)

CHAPTER 6 Setting Up

6-9 Settings Range for Light Intensity (INT. LIMIT)

Note

2. Press the

PRM

key repeatedly until the INT. LIMIT LED lights. The HIGH LED lights and the LC switches to the entry mode. Also, the current HIGH-INTENSITY LIMIT appears on the display panel.

INT.

HIGH

LOW

LIMIT OFFSET CAL

LIMIT

ANALOG

RATIO

BAUD RATE

DIGIT

PRM

3. Change the displayed value to the desired HIGH-INTENSITY LIMIT. To use the current HIGH-INTENSITY LIMIT, press the key. The

setting remains unchanged, and the LC will proceed to the setting of the HIGH-INTENSITY LIMIT (Step 5).

4. Press the key. Simultaneously, the HIGH and GO LEDs light and the LC is ready for setting the INTENSITY LIMIT TIME. The current INTENSITY LIMIT TIME appears on the display panel.

Note

HIGH

LOW

5. Change the displayed value to the desired INTENSITY LIMIT TIME. To use the current INTENSITY LIMIT TIME, press the key. The

setting remains unchanged, and the LC will proceed to the setting of the LOW-INTENSITY LIMIT (Step 7).

6. Press the key. The new INTENSITY LIMIT TIME is set and the HIGH and GO LEDs go off. Simultaneously, the LOW LED lights and the LC is ready to accept a new LOW-INTENSITY LIMIT. The display indicates the current LOWINTENSITY LIMIT.

HIGH

LOW

CHAPTER 6 Setting Up

Note

7. Change the displayed value to the desired LOW-INTENSITY LIMIT. To use the current LOW-INTENSITY LIMIT, press the key. The

setting remains unchanged, and the LC will proceed to setting of the levelcut time for LOW-INTENSITY LIMIT (Step 9).

8. Press the key. The new LOW-INTENSITY LIMIT is set. Simultaneously, the LOW and GO LEDs light and the system is switched to the setting mode. The display indicates the current INTENSITY LIMIT TIME.

6-9 Setting Range for Light Intensity (INT. LIMIT) 6-10 Setting Upper/Lower Limits for Measurements (Setting Tolerance)

HIGH

LOW

9. Change the displayed value to the desired INTENSITY LIMIT TIME.

Note

To use the current INTENSITY LIMIT TIME, press the key. The setting remains unchanged, and the LC will return to the measuring mode.

10. Press the key. The new INTENSITY LIMIT TIME is set, the LOW and GO LEDs go off, and the LC will return to the measuring mode.

Note

To cancel the entry of light intensity parameters, press the then the key as many times as required to return to the measuring mode. The entered value will also be canceled.

The light intensity parameters are set only after the LOW-INTENSITY LIMIT TIME has been entered and the key pressed. If you stop before entering all the parameters, the parameters entered will be canceled.

6-10 Setting Upper/Lower Limits for Measurements

(Setting Tolerance)

The LC can set upper/lower limits for measurements in each measurement mode. Measurements outside the preset range is indicated by the display or output signal. The upper/lower limits range differs, depending on the sensor head as shown below. Numbers in parentheses are factory settings.

PRM

key first,

Note

LC-2420: +299.99 µm (±200.00 µm) LC-2430: +599.98 µm (±500.00 µm) LC-2440: +5.9998 mm (±3.0000 mm) LC-2450: +15.9995 mm (±8.0000 mm)

Upper and lower measurement limits can be set for each measurement mode.

1. Choose the measurement mode and press the key.

2. Press the

PRM

key. The LIMIT LED lights. The HIGH LED lights and the LC is ready to accept a new upper limit. The display indicates the current upper limit.

LIMIT OFFSET CAL

LIMIT

ANALOG

RATIO

BAUD

RATE

DIGIT

PRM

INT.

3. Change the displayed value to the desired upper limit.

CHAPTER 6 Setting Up

6-10 Setting Upper/Lower Limits for Measurements (Setting Tolerance) 6-11 Setting Number of Displayed Digits

4 .Press the key.

The new upper limit is set. The LOW LED lights and the LC is ready to accept a new lower limit. The display now indicates the current lower limit.

HIGH

LOW

5. Change the displayed value to the desired lower limit.

6. Press the key. The new lower limit is set, and the LC returns to the measuring mode.

The upper/lower limits are set only after the key has been pressed. If you stop before entering the lower limit, the new upper limit will be canceled.

6-11 Setting Number of Displayed Digits

Follow the procedure below to set the number of displayed digits. Factory setting: All digits

1. Press the The display starts flashing.

LIMIT OFFSET

2. Press the or key to set the number of displayed digits. Every time the key is pressed, the number of digits on the display increases or decreases by one, thus activating or deactivating the last four digits. Press the key to increase the number of displayed digits; press the key to decrease it.

If you choose not to display integer digits, "0" will be displayed in these digits.

3. Press the key. Measurements will be displayed as specified.

PRM

key repeatedly until the DIGIT LED lights.

INT. LIMIT

ANALOG

RATIO

CAL

BAUD RATE

DIGIT

PRM

CHAPTER 6 Setting Up

Note

To cancel entry of the number of displayed digits, press the

PRM

key first, then the key as many times as required to return to the measuring mode.

6-12 Storing and Loading Settings (Programming)

A set of parameters, including an offset value and upper and lower measurement limits, can be stored as a program. Up to five different programs can be stored. By storing programs prepared for each target, the need for setting individual parameters is eliminated. This is useful when frequent product changeover is required.

Factory setting: See the factory setting of each parameter.

Storing Settings (SAVE)

Note

1. Set the parameters required for measurement, then switch the LC to the measuring mode.

2. Press the

SAVE

key. The LED above the key starts flashing and one of

the five PROGRAM LEDs lights.

2345

PROGRAM

3. Press the or key to select a program number.

• To cancel the saving of a program, press the

SAVE

key.

• When overwriting a previously saved program (corresponding PRO-

GRAM indicator is lit) be sure that this program does not contain settings that should be retained.

4. Press the key. The message "rEAdy" appears on the display panel. Press the key again to store the parameter settings. The LC is ready to measure using these settings.

5. Press the key.

Loading Stored Settings (LOAD)

Note

Follow the steps below to load the stored program.

1. Press the

LOAD

key. The LED above the key starts flashing and one of

the five PROGRAM LEDs lights.

2345

PROGRAM

2. Press the or key to select a program number.

245

1 3

To cancel the loading of a program, press the

PROGRAM

LOAD

key. The selected program will be canceled and the LC will return to the measurement mode.

CHAPTER 6 Setting Up

6-12 Storing and Loading Settings (Programming)

3. Press the key. The setting is loaded, and the LC switches to the measurement mode. The LED above the remains lit. At this time, if any parameter is changed the LED will go off.

1 3

LOAD

key goes off, but the selected PROGRAM LED

245

PROGRAM

CHAPTER 6 Setting Up

CHAPTER 7

MEASUREMENT PROCEDURE

7-1 Measuring with One Sensor Head................................. 44

7-2 Measuring with Two Sensor Heads............................... 45

7-1 Measuring with One Sensor Head

The versatile LC-2400 Series can measure height or eccentricity as well as displacement. With an optional board installed, the LC can measure thickness or height deviation using two sensor heads. Stored parameters can be quickly called up by using the LOAD function.

Note

• The LC requires 60 min. to warm up. Turn on the controller and wait at least 60 min. before starting measurements.

• If you find displayed values or output measurements incorrect, check the sensor head position as well as parameters.

Reference: Storing and Loading Settings (Programming) (P.41)

Error Message List (P.82)

7-1 Measuring with One Sensor Head

Measuring Target Height

Measure the target height with respect to the reference surface by following the procedures shown below.

[LC-2400A]

1. Turn the key-operated power switch to the ON position to turn on the LC controller.

2. Position the sensor head. Keep in mind the measuring range and angle of the sensor heads.

LC-2400A

OFF

POWER

Note

[LC-2400W]

1. To start the LC controller, turn on the power switch at the rear of the controller and then turn the key-operated switch to the ON position .

2. Position the sensor head. Keep in mind the measuring range and angle of the

LC-2400W

STAND-BY

POWER

sensor heads.

Reference: Adjusting Sensor Head Position (P.25)

When two sensor heads are connected, select either one by pressing the

1CH

3. Press the

2CH

key. The LED above the key lights.

NORMAL

key to switch the LC to the NORMAL measuring mode.

4. Calibrate the LC.

Reference: Correcting Measurement Error (Calibration) (P. 32)

5. Set the number of averaging measurements.

Reference: Reducing Variation in Measurement Data (Setting Number of Averaging

Measurements) (P.36)

6. Measure the reference surface of the target.

CHAPTER 7 Measurement Procedure

Note

7. Press the

ZERO

key. The displayed value and output are set to zero. Now the displayed value and output indicate the deviation in height from the reference value.

To determine the target shape, move the sensor head or target in parallel with respect to the other.

7-1 Measuring with One Sensor Head 7-2 Measuring with Two Sensor Heads

Measuring Runout and Eccentricity

Measure the runout and eccentricity of a revolving target by following the procedures shown below.

1. Position the sensor head. Be careful about the measuring range and angle of the sensor head.

Reference: Adjusting Sensor Head Position (P.25)

2. Turn the key-operated power switch to turn the system on.

LC-2400A

OFF

POWER

LC-2400W

STAND-BY

POWER

3. Calibrate the LC.

Reference: Correcting Measurement Error (Calibration) (P.32)

4. Set the number of averaging measurements.

Reference: Reducing Variation in Measurement Data (Setting Number of Averaging

5. Press the

Measurements) (P.36)

P–P

key to switch the LC to the NORMAL mode. Now the displayed value and output indicate the runout and eccentricity (max. and min. values).

6. To measure again, press the

7-2 Measuring with Two Sensor Heads

The LC-2400W series does not support this feature.

By installing the optional LC-B3 board, the LC-2400 can measure a target using two sensor heads. With two sensor heads used, thickness or height deviation can be measured by adding together the measurements from the two sensor heads or by subtracting one measurement from the other. Even while two sensor heads are connected, the LC can still be used for measurements that requires only one sensor head.

P–P

key to reset the measurement.

Note

Be sure to use sensor heads of the same model when measuring in the ADD or SUB mode.

CHAPTER 7 Measurement Procedure

7-2 Measuring with Two Sensor Heads

Measuring Thickness (ADD)

Measure the thickness of a target by following the procedures shown below.

1. Position the sensor heads and the reference target. Keep in mind the measuring range and angle of the sensor heads.

Equal distances

Reference: Adjusting Sensor Head Position (P.25)

2. Turn the key-operated power switch to turn on the LC.

LC-2400A

OFF

POWER

3. Press the

1CH

key. The LED above the key lights.

4. Calibrate the 1CH sensor head.

Reference: Correcting Measurement Error (Calibration) (P.32)

5. Press the

2CH

key. The LED above the key lights.

6. Calibrate the 2CH sensor head.

7. Press the

ADD

key. The LED above the key lights.

8. Set the number of averaging measurements as in Step 4.

Reference: Reducing Variation in Measurement Data (Setting Number of Averaging

Measurements) (P.36)

CHAPTER 7 Measurement Procedure

9. Press the

NORMAL

key. The LED above the key lights.

The LC is now in the NORMAL mode.

10. Press the

ZERO

key. The displayed value and output are set to zero. Now the displayed value and output indicate the deviation in thickness from the reference value. Skip this step and follow the steps described below to display and output the thickness.

7-2 Measuring with Two Sensor Heads

11. Change the current offset value to the thickness of the target. When entry of the offset value is complete, the display will show the reference thickness.

LIMIT OFFSET

CAL

LIMIT

ANALOG

RATIO

BAUD RATE

DIGIT

PRM

INT.

The following shows the maximum displayable thicknesses using the LC sensor heads:

Sensor head Max. value

LC-2420 +327.66 µm LC-2430 +655.32 µm LC-2440 +6.5532 mm LC-2450 +16.3830 mm

If the measurement that contains the offset value exceeds the display range, the LC holds the measurement at the maximum value.

Reference: Offset Values (P.35)

Measuring Height Deviation (SUB)

12. Start measurement. Thickness of the target is displayed and output. If the automatic zero setting function was executed in Step 10, deviation from the reference value will be displayed and output.

Measure height deviation by following the procedures shown below.

1. Position the sensor heads and the target. Be careful about the measuring range and the angle of the sensor heads.

Reference: Adjusting Sensor Head Position (P.25)

2. Turn the key-operated power switch to turn the system on.

LC-2400A

OFF

POWER

3. Press the

1CH

key. The LED above the key lights

4. Calibrate the 1CH sensor head.

Reference: Correcting Measurement Error (Calibration) (P.32)

5. Press the

2CH

key. The LED above the key lights.

CHAPTER 7 Measurement Procedure

7-2 Measuring with Two Sensor Heads

6. Calibrate the 2CH sensor head.

7. Press the

SUB

key. The LED above the key lights.

8. Set the number of averaging measurements.

Reference: Reducing Variation in Measurement Data (Setting Number of Averaging

9. Press the

Measurements) (P.36)

NORMAL

key. The LED above the key lights.

The LC is now in the NORMAL mode.

10. Press the

ZERO

11. Change the current offset value to the height deviation of the reference target. When entry of the offset value is complete, the display will show the reference height deviation.

LIMIT OFFSET

CAL

LIMIT

ANALOG

RATIO

BAUD RATE

DIGIT

PRM

INT.

The following shows the range of height deviation values that can be displayed using the LC sensor heads:

Sensor head Range

LC-2420 +327.66 µm to -327.67 µm LC-2430 +655.32 µm to -655.34 µm LC-2440 +6.5532 mm to -6.5534 mm LC-2450 +16.3830 mm to -16.3835 mm

If the measurement that contains the offset value exceeds the display range, the LC holds the measurement at the corresponding value.

12. Start measurement. The target height difference is displayed and output as an absolute value. When you start measurements, after pressing the auto-zero key as shown in step 10, the deviation in height difference from the reference value is displayed and output.

CHAPTER 7 Measurement Procedure

CHAPTER 8

EXTERNAL INPUT/OUTPUT

8-1 RS-232C Interface......................................................... 50

8-2 Control I/O (Standard Equipment on Display Unit)........ 71

8-3 Monitor Output (Standard Equipment)........................... 73

8-4 Digital I/O (Standard Equipment on Control Unit).......... 74

For information on the optional GP-IB (LC-B1) or DIGITAL I/O (LC-B2) boards, please refer to Chapter 9, section 9-9.

8-1 RS-232C Interface (Standard Equipment)

The LC-2400 series is equipped with an RS-232C serial interface, control I/O port (when the display unit is used), monitor output, and a digital I/O board. Using these I/O connections, the LC can transmit measurement data and alarm signals to external equipment and receive parameter settings from external equipment.

8-1 RS-232C Interface (Standard Equipment)

The LC-2400 series can communicate with a computer using the RS-232C interface. It can transmit measurement data to the computer and receive control signals from the computer. When the control unit is used separately, the parameters of each function can be set by the computer.

CAUTION

Specifications

Communication Parameters

The ferrite cores are packaged with the LC-2400W series. When using the RS-232C or the CONTROL I/O connecting cable, attach the appropriate ferrite cores at both ends of the cable. Otherwise, noise interference may occur.

When using the RS-232C cable

This serial interface conforms to EIA (Electronic Industries Association) RS232C specifications.

Duplex Full Synchronization Start-stop Data format ASCII Data bit length 7/8 bit* Stop bit length 1/2 bit* Parity check Even/odd/none* Baud rate 75/150/300/600/1200/2400/4800/9600/19200 bps*

* Parameters are selectable.

Connecting Cable

CHAPTER 8 External Input/Output

Use a standard serial cable for connection to a computer. For alternative connection configurations, see the following.

When using a personal computer:

[Example 1]

Personal computer

LC-2400A/ LC-2400W

[Example 2]

Personal

computer

1 2 3 7 4 6 8 5

LC-2400A/ LC-2400W

1 2 3 7

Pin Assignment

8-1 RS-232C Interface (Standard Equipment)

14 15 16 17 18 19 20 21 22 23 24 25

1 2 3 4 5 6 7 8 9 10 11 12 13

Pin No. RS-232C signals Description of signals Input/output

1 Shield Shield (common to signal

ground)

2 SD (TXD) Receives data from exter-

nal equipment.

3 RD (RXD) Transmits measurement

Input

Output

data to external equipment.

5 CS (CTS) ON (High) when the power

Output

is turned on

6 DR (DSR) ON (High) when the power

Output

is turned on 7 SG (GND) Signal ground 8 CD (DCD) ON (High) when the power

Output

is turned on

20 ER (DTR) Enables transmission of

measurement data to

external equipment when

Input

the signal is ON (High).

Note

Setting Communication Parameters

Note

Setting Communication Parameters When Using the Control Unit Together with the Display Unit

Pin 20 is connected to the power supply through a pull-up resistor inside the LC controller. Even if this terminal is not connected to external equipment, measurement data can be output.

Initial settings Baud rate: 1200 bps Data bit length: 8 bits Parity check: None Stop bit length: 1 bit

Be sure that the communication parameters of the LC are the same as those of the external device.

When the control unit is installed in the display unit, communication parameters can be set using the display unit keys.

1. Press the

PRM

key until the BAUD RATE indicator lights.

The current baud rate is displayed on the display panel.

NORMAL P±P

HIGH

LOW

LASER ON

AUTO1234

INT.

LIMIT OFFSET CAL

12345

ANALOG

LIMIT

RATIO

GAIN

BAUD

DIGIT

RATE

PRM

PROGRAM

LOCK

GAIN

1CH

PRM

AVERAGE

LOAD

SAVE

PROGRAM

CHAPTER 8 External Input/Output

8-1 RS-232C Interface (Standard Equipment)

2. Press the or key to select the desired baud rate.

3. Press the key.

The following baud rates can be selected. 75/150/300/600/1200/2400/4800/9600/19200

The remaining parameters are displayed on the display panel.

Date bit length

bit

HIGH

LOW

LASER ON

AUTO1234

INT.

LIMIT OFFSET CAL

123 45

ANALOG

LIMIT

RATIO

Parity check

Even

Odd

None

GAIN

BAUD

DIGIT

RATE

PRM

PROGRAM

LOCK

Stop bit length

1 bit

2 bit

4. Press the or key to select the desired parameter. The following data formats can be selected.

CHAPTER 8 External Input/Output

Note

To cancel entry of communication parameters, press the then press the key several times until the LC returns to the measurement mode. Any changes are ignored, and the LC is in the measurement mode.

5. Press the key. Once the communication parameters are entered, the LC will return to the measurement mode.

PRM

key and

8-1 RS-232C Interface (Standard Equipment)

Setting Communication Parameters with the Separate Control Unit

When the control unit is used separately, adjust the baud rate using the baud rate dial, located on the side of the control unit.

Control unit side view

Baud rate setting dial

Dial numbers and baud rates correspond as shown below:

Dial number

Baud rate

0123456789

75 150 300 600 1200 2400 4800 9600 19200 19200

Note

Changing and Verifying Parameter Settings using External Equipment

• When the control unit is used separately, parameters other than baud rate are fixed at the following values: Data bit length: 8 bits, Parity check: None, Stop bit length: 1 bit

• When the baud rate is changed using the display unit keys after installing the control unit in the display unit, the baud rate set with the baud rate dial is ignored.

By transmitting the proper character or ASCII code from an external device to the LC, the LC parameter settings can be changed or verified.

Procedure for Changing and Verifying Parameter Settings

Follow the procedure below to change or verify parameter settings.

External equipment

1. Transmit the proper character or ASCII code from the external device to the LC.

Note

2. When the character is received by the LC, the message "PASS CR" is sent to the external device. The parameter is changed to the setting corresponding to the character.

When a character for setting measurement output or information output is received, the LC does not output the "PASS CR" message.

CHAPTER 8 External Input/Output

8-1 RS-232C Interface (Standard Equipment)

3. Send the desired value from the external device to the LC.

Note

Response Data Format

Changing Gain, Measurement Mode and Number of Averaging Measurements

When the required setting procedure is completed in step (2), step (3) is not necessary.

The data output from the LC to external equipment is called "response data". Response data for verifying parameter settings is output in the following format:

1st data segment

2nd data segment 3st data segment X-th data segment

"CR" is a symbol indicating

the end of the data stream

To change or set gain, measurement mode and number of averaging measurements, select the proper character or ASCII code from the following table and send it from the external device to the LC.

Transmission code

Function

Changing gain

Desired setting

Character ASCII code

AUTO SP 20H GAIN1 ! 21H GAIN2 ” 22H GAIN3 # 23H GAIN4 $ 24H

Changing measurement mode

NORMAL % 25H

P-P & 26H

PEAK ’ 27H

BOTTOM ( 28H

Changing number of averaging measurements

1 ) 29H 2*2AH 4+2BH

8 , 2CH 16 2DH 32 . 2EH 64 / 2FH

128 0 30H 256 1 31H

512 2 32H 1024 3 33H 2048 4 34H 4096 5 35H 8192 6 36H

16384 7 37H 32768 8 38H 65536 9 39H

131072 : 3AH

CHAPTER 8 External Input/Output

8-1 RS-232C Interface (Standard Equipment)

Setting the AUTO-ZERO/ HOLD/FILTER/PANEL LOCK Functions

Note

Setting Upper/Lower Limits, Parameters, and Filter

To set each function, select the proper character or ASCII code from the following table and send it from the external device to the LC.

Function

AUTO-ZERO ON/OFF AUTO-ZERO ON ; 3BH

HOLD ON/OFF HOLD ON = 3DH

PANEL LOCK ON/OFF PANEL LOCK ON ? 3FH

FILTER ON/OFF FILTER ON A 41H

The PANEL LOCK function is used to disable any input from the display unit keys. The LOCK indicator is lit when the PANEL LOCK function is ON.

To set upper/lower limits, parameters and filter, select the proper character or ASCII code from the following table and send it from an external device to the LC.

Function

Upper/lower limits

Parameters OFFSET e 65H

FILTER FILTER preset value m 6DH

NORMAL mode upper limit C 43H NORMAL mode lower limit D 44H P-P mode upper limit E 45H P-P mode lower limit F 46H PEAK mode upper limit G 47H PEAK mode lower limit H 48H BOTTOM mode upper limit I 49H BOTTOM mode lower limit J 4AH

Calibration f 66H HIGH-INTENSITY LIMIT g 67H HIGH-INTENSITY LIMIT TIME h 68H LOW-INTENSITY LIMIT i 69H LOW-INTENSITY LIMIT TIME j 6AH Analog ratio k 6BH DIGIT SUPPRESS l 6CH

Desired setting

AUTO-ZERO OFF < 3CH

HOLD OFF > 3EH

PANEL LOCK OFF @ 40H

FILTER OFF B 42H

Desired setting

Transmission code

Character ASCII code

Transmission code

Character ASCII code

The procedure for setting the upper/lower limits, parameters, and filter is as follows:

1. Select the desired sensor head (1CH/2CH) or function (ADD/SUB).

2. After receiving the "PASS CR" message from the LC, send the required character or ASCII code to the LC.

3. Send the desired value to the LC.

CHAPTER 8 External Input/Output

8-1 RS-232C Interface (Standard Equipment)

The upper/lower limits, parameters, and filter values must be in the following ranges. The upper/lower limits and OFFSET value are output with a "+" or "-" sign.

Item Sensor head Setting range

Upper/lower limits LC-2420 - 299.99 to + 299.99 µm

LC-2430 - 599.98 to + 599.98 µm LC-2440 - 5.9998 to + 5.9998 mm LC-2450 - 15.9995 to + 15.9995 mm

Parameters

Filter All models 0100 to 4999 Hz

OFFSET LC-2420 - 199.99 to + 199.99 µm

LC-2430 - 499.98 to + 499.98 µm LC-2440 - 2.9998 to + 2.9998 mm LC-2450 - 7.9995 to + 7.9995 mm

Calibration All models 0.9000 to 1.1000

(See P.35.)

HIGH-INTENSITY LIMIT

LOW-INTENSITY LIMIT

HIGH-INTENSITY LIMIT TIME 0000.0 to 2999.9 ms

LOW-INTENSITY 9999.9 (Infinity) LIMIT TIME

ANALOG RATIO All models 0 to 5 (See P.73) DIGIT SUPPRESS All models 0 to 4 digits

All models

00000 to 49998

Measurement Data Output Method

Note

• When the upper/lower limits, parameters, and filter values exceed the above ranges, the error message "ERROR CR" is returned.

• When the ADD or SUB function is selected, calibration, INT. LIMIT and gain cannot be set.

• Be sure to set HIGH-INTENSITY LIMIT higher than LOW-INTENSITY LIMIT.

• The filter function can be set only when the display unit is used.

The LC outputs displacement and intensity measurement values using the following four methods. To output these measurement values, select the desired character or ASCII code in the following table and transmit it from an external device to the LC.

CHAPTER 8 External Input/Output

8-1 RS-232C Interface (Standard Equipment)

Output method

Character ASCII code

Single output of displacement M 4DH measurement value

Single output of displacement and N 4EH intensity measurement values

Continuous output of displacement O 4FH measurement value

Continuous output of displacement P 50H and intensity measurement values

Quit continuous output Q 51H

Send character "Q" or ASCII code "51H" when in continuous output mode. Even if character "Q" ("51H") is received while in single output mode, the LC ignores this codes.

■ Single output of displacement and intensity measurement values

[External equipment to the LC] Character: N ASCII code: 4EH

[Output data]

Code transmitted to the LC

[The LC to external equipment]

1st data segment

Displacement

"+" or"-" sign

10st data segment

Intensity

2nd data segment 8st data segment 9st data segment

• • • • •

Numerical data

14st data segment 15st data segment

• • • • •

Numerical data

Example: When a displacement of + 2.0000 mm is measured using the diffuse-reflective sensor head (LC-2440/LC-2450), the LC outputs the displacement and intensity measurement values sequentially in the following format:

Displacement Intensity

SP A CE

sign 10 digit

2000

2.0000C

10 digit

Decimal point

-1 -2

10 digit

10 digit 10 digit10 digit

-3

-4

■ Single output of displacement measurement value

[External equipment to the LC] Character: M ASCII code: 4DH

Example: When a displacement of - 20.02 µm is measured using the regular-reflective sensor head (LC-2420/LC-2430), the LC outputs the displacement measurement value once in the following format:

SP A CE

20.02C

CHAPTER 8 External Input/Output

8-1 RS-232C Interface (Standard Equipment)

Note

Verifying Parameter Settings and Output Conditions

a [SPACE] is output for any digit having no data.

■ Continuous output of displacement and intensity measurement values or continuous output of displacement measurement values

When the displacement and intensity continuous output method or the displacement continuous output method is selected, the above measurement values are output at a predetermined time interval.

■ Measurement error

When a measurement error occurs, the LC outputs the following values:

(When using the LC-2420 or LC-2430 sensor head)

(When using the LC-2440 or LC-2450 sensor head)

99.99C

.9999C

Measurement output values are changed depending on the specified number of averaging measurements.

Current parameter settings and output conditions can be verified by transmitting an character or ASCII code to the LC. The LC outputs the current parameter settings and output conditions corresponding to the specified ASCII code (character).

Parameter setting/output mode

Code transmitted to the LC

Character ASCII code

Alarm output mode R 52H Preset gain S 53H Preset measurement mode T 54H NORMAL mode upper/lower limits U 55H P-P mode upper/lower limits V 56H PEAK mode upper/lower limits W 57H BOTTOM mode upper/lower limits X 58H Preset number of averaging Y 59H

measurements OFFSET preset value Z 5AH CALIBRATION preset value [ 5BH INT. LIMIT preset value ¥ 5CH Preset analog ratio ] 5DH DIGIT SUPPRESS preset value ^ 5EH AUTO-ZERO ON/OFF – 5FH HOLD ON/OFF ' 60H FILTER ON/OFF a 61H FILTER preset value b 62H Preset program number c 63H Preset function d 64H

CHAPTER 8 External Input/Output

■ Alarm output mode

[External equipment to the LC] Character: R ASCII code: 52H

[The LC to external equipment]

8-1 RS-232C Interface (Standard Equipment)

Note

1st data segment

2nd data segment 3rd data segment 4th data segment 5th data segment 6th data segment 7th data segment 8th data segment 9th data segment

HIGH

LOW

+AREA OVER

± BDEGCR

-AREA OVER

BRIGHT DARK ERROR GO

When the response data includes no alarm output, the LC feeds back the character " * " or the ASCII code "2AH".

Example: "HIGH" and "+ AREA OVER" alarm output

H CR

✽ ✽✽✽✽✽

■ Verifying the preset gain

[External equipment to the LC] Character: S ASCII code: 53H

[The LC to external equipment]

1st data segment 2nd data segment 3rd data segment

Note

Preset data

Example:

• When the gain is set to GAIN 1 in the AUTO gain selector mode:

NRC

• When the gain is set to GAIN 1:

G1C

When the gain is set to GAIN 2, GAIN 3 or GAIN 4, the 2nd data segment is changed to "2", "3" or "4".

■ Verifying the preset measurement mode

[External equipment to the LC] Character: T ASCII code: 54H

[The LC to external equipment]

1st data segment 2nd data segment 3rd data segment

Preset data

CHAPTER 8 External Input/Output

8-1 RS-232C Interface (Standard Equipment)

Example: When the measurement mode is set to NORMAL:

Note

NRC

When the measurement mode is set to P-P, PEAK or BOTTOM, the first and 2nd data segment are changed to "PP", "PK" or "BT".

■ Verifying the preset upper/lower limits

[External equipment to the LC] Character: U to X ASCII code: 54H to 58H

[The LC to external equipment]

1st data segment 2nd data segment 8th data segment 9th data segment

Sign (+ or -) Numerical data

a [SPACE] is output for any digit having no data. Be sure to verify the preset measurement mode before verifying the upper/lower limit settings.

Example: When the upper limit is set to + 2.5000 mm and the lower limit is set to -

0.1500 mm in the NORMAL measurement mode using the diffuse-reflective

sensor head:

SP A CE

2 0

. .1500C

5000C

Example: When the upper limit is set to + 20.02 µm and the lower limit is set to - 0.21 µm in the NORMAL measurement mode using the regular-reflective sensor head:

SP A CE

SP A CE SPA CE

20.02C

0.21C

■ Verifying the preset number of averaging measurements

[External equipment to the LC] Character: Y ASCII code: 59H

[The LC to external equipment]

1st date segment

2nd date segment 7th data segment

• • •

CHAPTER 8 External Input/Output

Note

Numerical date

The number of digits for the above response data varies depending on the specified number of averaging measurements.

8-1 RS-232C Interface (Standard Equipment)

Example: When the number of averaging measurements is set to 128:

Note

■ Verifying the OFFSET preset value

[External equipment to the LC] Character: Z ASCII code: 5AH

[The LC to external equipment]

1st data segment 2nd data segment 8th data segment 9th data segment

Sign (+ or -) Numerical data

Example: When the OFFSET value is set to - 1.567 mm:

SP A CE

.5670C

The OFFSET value is output in the same format as measurement values.

■ Verifying the CALIBRATION preset value

[External equipment to the LC] Character: [ ASCII code: 5BH

Note

[The LC to external equipment]

1st date segment

2nd date segment 7th data segment

• • •

Numerical date

When the calibration setting is verified, the LC outputs a calibration coefficient.

Calibration coefficient (P.35)

Example: When the calibration coefficient is set to 0.9876:

876C

■ Verifying the INT. LIMIT preset values

[External equipment to the LC] Character: " ASCII code: 5CH

CHAPTER 8 External Input/Output

8-1 RS-232C Interface (Standard Equipment)

[The LC to external equipment]

HIGH-INTENSITY LIMIT (H.I.L.) / LOW-INTENSITY LIMIT (L.I.L.)

Note

1st data segment

Numerical data

HIGH-INTENSITY LIMIT (H.I.L.T .) / LO W -INTENSITY LIMIT TIME (L.I.L.T.)

1st data segment 5th data segment 7th data segment

Numerical data

5th data segment 6th data segment

The INT. LIMIT preset values are output sequentially in the order of HIGHINTENSITY LIMIT (H.I.L.), HIGH-INTENSITY LIMIT TIME (H.I.L.T.), LOWINTENSITY LIMIT (L.I.L.) and LOW-INTENSITY LIMIT TIME (L.I.L.T.).

Example: When the INT. LIMIT values are set to the following values: H.I.L. = 10000 H.I.L.T. = 0000.0 ms L.I.L. = 00050 L.I.L.T. = 9999.9 ms

1 0 0

000CR

050CR

0.0CR

9.9CR

■ Verifying the preset analog ratio

[External equipment to the LC] Character: ] ASCII code: 5DH

[The LC to external equipment]

1st data segment 4th data segment 5th data segment

Numerical data

Example: When the analog ratio is set to 100 µm/V:

10C

■ Verifying the DIGIT SUPPRESS preset value

[External equipment to the LC] Character: ^ ASCII code: 5EH

CHAPTER 8 External Input/Output

[The LC to external equipment]

8-1 RS-232C Interface (Standard Equipment)

1st data segment

Numerical data

2nd data segment

Example: When the DIGIT SUPPRESS value is set to "1-digit":

■ Verifying the AUTO-ZERO ON/OFF status

[External equipment to the LC] Character: — ASCII code: 5FH

[The LC to external equipment]

1st data segment 2nd data segment

—

ON or OFF

Example: When the AUTO-ZERO function is ON:

Note

When the AUTO-ZERO function is OFF, the LC outputs the message "ZOFF".

■ Verifying the HOLD ON/OFF status

[External equipment to the LC] Character: ' ASCII code: 60H

[The LC to external equipment]

1st data segment 2nd data segment

—

ON or OFF

Example: When the HOLD function is OFF:

Note

When the HOLD function is ON, the LC outputs the message "H-ON".

CHAPTER 8 External Input/Output

8-1 RS-232C Interface (Standard Equipment)

■ Verifying the FILTER ON/OFF status

[External equipment to the LC] Character: a ASCII code: 61H

[The LC to external equipment]

Example: When the FILTER function is ON:

1st data 2nd data

–

ON or OFF

Note

When the FILTER function is OFF, the LC outputs the message "F-OFF".

■ Verifying the preset CUTOFF frequency

[External equipment to the LC] Character: b ASCII code: 62H

[The LC to external equipment]

1st data segment 4th data segment 5th data segment

Numerical data

Be sure to verify the FILTER status before verifying the preset CUTOFF frequency.

Example: When the CUTOFF frequency is set to 100 Hz:

CHAPTER 8 External Input/Output

10C

■ Verifying the preset program number

[External equipment to the LC] Character: c ASCII code: 63H

[The LC to external equipment]

1st data segment

Numerical data

2nd data segment

Example: When no program is running:

8-1 RS-232C Interface (Standard Equipment)

Note

When Program No. 1, 2, 3, 4 or 5 is running, the 1st data segment is changed to 1, 2, 3, 4 or 5.

Example: When Program No. 1 is running:

■ Verifying the preset function

[External equipment to the LC] Character: d ASCII code: 64H

[The LC to external equipment]

1st data segment 2nd data segment 3rd data segment 4th data segment

Function symbol (1CH / 2CH / ADD / SUB)

Example: When the function is set to 1CH:

Note

When the function is set to 2CH, ADD or SUB, the LC outputs the mes-

sage "2CH", "ADD" or "SUB".

Setting Programs The parameter settings can be saved and loaded by sending signals from

external equipment to the LC. When the following character or ASCII code is transmitted from an external device (e.g. a computer) to the LC, the parameter settings can be saved and loaded. The LC can store up to 5 parameter setting programs. The program numbers correspond to the PROGRAM indicator numbers provided on the display panel. For initial settings of each program, see page 90.

Function

Code transmitted to the LC

Character ASCII code

Program No. 1 SAVE n 6EH Program No. 2 SAVE o 6FH Program No. 3 SAVE P 70H Program No. 4 SAVE q 71H Program No. 5 SAVE r 72H Program No. 1 LOAD s 73H Program No. 2 LOAD t 74H Program No. 3 LOAD u 75H Program No. 4 LOAD v 76H Program No. 5 LOAD w 77H

CHAPTER 8 External Input/Output

8-1 RS-232C Interface (Standard Equipment)

■ Saving parameter settings (SAVE)

When the desired character or ASCII codes are transmitted from an external device (e.g. a computer) to the LC, the LC outputs the message "PASS CR" to the external device and saves the parameter settings in the backup program area. The following is an example of the procedure for saving parameter settings.

Saving parameter settings in Program No. 1

1. Set the parameters required for measurement. The LC will be in the

2. To save the parameter settings in Program No. 1, send the character "n"

3. The LC sends back the message "PASS CR", and the current measure-

■ Loading parameter settings (LOAD)

When the desired character or ASCII code is transmitted from an external device (e.g. a computer) to the LC, the LC outputs the "PASS CR" message to the external device and loads the program stored in the backup program area, according to the specified character or ASCII code.

measurement mode.

from an external device to the LC.

ment conditions are saved in Program No. 1.

Changing the Function (When using two sensor heads)

Note

Loading the parameter settings stored in Program No. 1

1. Send character "s" from an external device to the LC.

2. The "PASS CR" message is output from the LC, and Program No. 1 is loaded. The current parameter settings are changed to the parameter settings stored in Program No. 1.

If a program is specified which has no stored settings, the parameter settings revert to the factory settings.

The following four functions (sensor heads or measurement modes) can be selected. To change each function, select the desired character or ASCII code in the following table, and send it from external equipment to the LC. If the specified character or ASCII code is not properly received, the LC will output an "ERROR CR" message and will not perform the specified operation.

Function

CH1 x 78H CH2 y 79H ADD z 7AH SUB { 7BH

Code transmitted to the LC Character ASCII code

CHAPTER 8 External Input/Output

Note

These functions cannot be changed without the LC-B3 board.

RS-232C Code List

8-1 RS-232C Interface (Standard Equipment)

Function

Changing gain SP 20H AUTO

Changing measurement mode

Changing number of averaging measurements

Setting upper/lower limits

Code transmitted to the LC

Character ASCII code

! 21H GAIN1

" 22H GAIN2 # 23H GAIN3 $ 24H GAIN4

% 25H NORMAL

& 26H P-P

’ 27H PEAK

( 28H BOTTOM

) 29H AVE1

* 2AH AVE2 + 2BH AVE4

, 2CH AVE8

— 2DH AVE16

. 2EH AVE32

/ 2FH AVE64 0 30H AVE128 1 31H AVE256 2 32H AVE512 3 33H AVE1024 4 34H AVE2048 5 35H AVE4096 6 36H AVE8192 7 37H AVE16384 8 38H AVE32768 9 39H AVE65536

: 3AH AVE131072

; 3BH AUTO-ZERO ON < 3CH AUTO-ZERO OFF = 3DH HOLD ON > 3EH HOLD OFF ? 3FH PANEL LOCK ON

@ 40H PANEL LOCK OFF

A 41H FILTER ON B 42H FILTER OFF

C 43H NORMAL mode upper limit D 44H NORMAL mode lower limit

E 45H P-P mode upper limit F 46H P-P mode lower limit

G 47H PEAK mode upper limit H 48H PEAK mode lower limit

I 49H BOTTOM mode upper limit J 4AH BOTTOM mode lower limit

Setting item

CHAPTER 8 External Input/Output

8-1 RS-232C Interface (Standard Equipment)

Function

Measurement data output

Information output R 52H Alarm output mode

Parameter settings e 65H OFFSET

FILTER preset value m 6DH Preset CUTOFF frequency Program (SAVE) n 6EH Program No. 1 SAVE

Code transmitted to the LC

Character ASCII code

M 4DH Single output of displacement

measurement value

N 4EH Single output of displacement

and intensity measurement values

O 4FH Continuous output of displace-

ment measurement values

P 50H Continuous output of displace-

ment and intensity measurement values

Q 51H Quit continuous output

S 53H Preset gain T 54H Preset measurement mode U 55H NORMAL mode upper/lower

limits

V 56H P-P mode upper/lower limits

W 57H PEAK mode upper/lower limits

X 58H BOTTOM mode upper/lower

limits

Y 59H Preset number of averaging

measurements

Z 5AH OFFSET preset value

[ 5BH CALIBRATION preset value

¥ 5CH INT. LIMIT preset value

] 5DH Preset analog ratio

^ 5EH DIGIT SUPPRESS preset

value

— 5FH AUTO-ZERO ON/OFF

' 60H HOLD ON/OFF a 61H FILTER ON/OFF b 62H FILTER preset value

c 63H Preset program number

d 64H Preset function

f 66H Calibration g 67H HIGH-INTENSITY LIMIT h 68H HIGH-INTENSITY LIMIT TIME

i 69H LOW-INTENSITY LIMIT

j 6AH LOW-INTENSITY LIMIT TIME

k 6BH Analog ratio

l 6CH DIGIT SUPPRESS

o 6FH Program No. 2 SAVE p 70H Program No. 3 SAVE q 71H Program No. 4 SAVE

r 72H Program No. 5 SAVE

Setting item

CHAPTER 8 External Input/Output

8-1 RS-232C Interface (Standard Equipment)

Program (Load) s 73H Program No. 1 LOAD

Preset function x 78H Setting 1CH

Sample Program

Function

Code transmitted to the LC

Character ASCII code

Setting item

t 74H Program No. 2 LOAD u 75H Program No. 3 LOAD v 76H Program No. 4 LOAD

w 77H Program No. 5 LOAD

y 79H Setting 2CH z 7AH Setting ADD

{ 7BH Setting SUB

Program 1

In the following program, the LC outputs measurement values to a personal computer when "M" is entered on the computer keyboard.

100 OPEN “COM1:4800,N,8,1,RS,CS,DS,CD” FOR RANDOM AS #1 110 ON COM(1)GOSUB 170 120 COM(1)ON 130 A$=INKEY$ 140 IF A$<>“M” THEN 130 150 PRINT #1,A$; 160 GOTO 130 170 N=LOC(#1) 180 IF N=0 THEN RETURN 190 B$=INPUT$(N,#1) 200 IF RIGHT$(B$,1)=CHR$(13) THEN PRINT B$ ELSE PRINT B$; 210 RETURN

CHAPTER 8 External Input/Output

8-1 RS-232C Interface (Standard Equipment)

Program 2

In the following program, the LC sequentially outputs 100 measurement values to a computer. The computer display shows the maximum, minimum and average values of the output data when "S" is entered through the computer key board.

100 DIM A$(100) 110 PRINT “START or END ? (PUSH [S] or [E] Key)” 120 PRINT 130 A$=INPUT$(1) 140 IF A$“E” OR A$=“e” THEN END 150 IF A$<>“S” AND A$<>“S” THEN 130 160 OPEN “COM1:4800,N,8,1 170 PRINT #1,“0”; 180 FOR I=1 TO 100 190 INOUT #1,A$(I) 200 NEXT I 210 PRINT #1,“Q”; 220 FOR I=1 TO 500 :NEXT I 230 IF FOR(1)=0 THEN INPUT #1,DAMMY$ :GOTO 230 240 CLOSE #1 250 MAX=-1000 :MIN=1000 :SUM=0 260 FOR I=1 TO 100 270 A=VAL(A$(I)) 280 IF A>MAX THEN MAX=A 290 IF A<MIN THEN MIX=A 300 SUM=SUM+A 310 NEXT I 320 AVE=SUM/100 330 PRINT USING “MAX =###.#### mm”;MAX 340 PRINT USING “MiX =###.#### mm”;MIN 350 PRINT USING “AVE =###.#### mm”;AVE 360 PRINT 370 GOTO 110

Displays prompt for starting or stopping measurement.

,RS,CS,DS,CD” FOR RANDOM AS #1

Instruction to start continuous

Data input

Performs arithmetic operations to obtain the maximum, minimum and average values.

Displays the maximum, minimum and average values.

data output Instruction to

stop continuous data output

Discards the data entered after the continuous data output has stopped.

Note

Be sure that the baud rate of the LC is identical to that of the computer.

CHAPTER 8 External Input/Output

8-2 Control I/O (Standard equipment on Display Unit)

8-2 Control I/O (Standard Equipment on Display Unit)

The operation of the LC-2400 series can be controlled by sending signals from an external device (e.g. a computer) to the LC. By shorting the desired control input pin and the GND pin, preset functions, program numbers and the HOLD/AUTO-ZERO ON/OFF status can be changed. Also, the LC outputs various alarm signals for indicating abnormal measurement conditions (e.g. INTENSITY alarm signal).

Specifications

CAUTION

When using the CONTROL I/O cable

Output

Open-collector Maximum applied voltage: 30 V Maximum sink current: 100 mA

Photo-coupler

2.2 Ω 33 V

OUT

COM

Input

Non-voltage input

+12 V

Photo-coupler

• Contact input

LC Control input

• Open-collector input

1.8 kΩ

680 Ω

IN GND

GND

• Open-collector

Control input

GND

CHAPTER 8 External Input/Output

8-2 Control I/O (Standard equipment on Display Unit)

Pin Names and Functions

Pin No. Input/output Signal name Description

1 Output INTENSITY alarm output OFF in the DARK and BRIGHT modes 2 – COM 3 Output AREA OVER output (NEAR) ON when a target is out of the measuring range

4 – COM 5 Output AREA OVER output (FAR) ON when a target is out of the measuring range

6 Output GO output ON when a measurement value is within the

7 – COM 8 Output Upper limit (HIGH) output ON when a measurement value exceeds the

9 – COM

10 Output Lower limit (LOW) output ON when a measurement value falls below the

11 Input FUNCTION 1CH input* When pin 11 and the GND pin are short-circuited,

12 Input FUNCTION 2CH input* When pin 12 and the GND pin are short-circuited,

13 Input AUTO-ZERO input When pin 13 and the GND pin are short-circuited,

14 – GND 15 Input AUTO-ZERO reset input When pin 15 and the GND pin are short-circuited,

16 Input HOLD input When pin 17 and the GND pin are short-circuited,

17 – GND 18 Input Program 1 When pin 18 and the GND pin are short-circuited,

19 Input Program 2 When pin 19 and the GND pin are short-circuited,

20 Input Program 3 When pin 20 and the GND pin are short-circuited,

21 Input Program 4 When pin 21 and the GND pin are short-circuited,

22 Input Program 5 When pin 22 and the GND pin are short-circuited,

23 – GND 24 – GND

1CH/2CH input is enabled only when the LC-B3 board is installed.

(NEAR)

(FAR)

upper/lower limits.

upper limit.

lower limit.

the function is changed to 1CH.

the function is changed to 2CH.

the AUTO-ZERO input turns ON.

the AUTO-ZERO input is reset.

the HOLD input turns ON.

program No. 1 is loaded.

program No. 2 is loaded.

program No. 3 is loaded.

program No. 4 is loaded.

program No. 5 is loaded.

Note

CHAPTER 8 External Input/Output

If a program is specified when no data is stored, the measurement mode is changed to the initial parameter settings.

8-3 Monitor Output (Standard Equipment)

The LC-2400 series outputs an analog voltage, proportional to the target displacement, through the DISPLACEMENT connector and an analog voltage, proportional to the intensity, through the INTENSITY connector.

8-3 Monitor Output (Standard Equipment)

Analog Displacement Output

Setting Output Range (Analog Ratio)

Note

The LC outputs an analog voltage proportional to the target displacement. Output range: - 10 to + 10 V

Output impedance: 0 Ω Current capacity: 10 mA

BNC connector

• When the analog output voltage exceeds the specified output range, the output voltage is retained to + 10 V or - 10 V.

• When an error message is displayed, the output voltage is retained to + 10 V.

6 steps of output range can be selected for analog displacement output. The output range setting procedure is as follows:

1. Press the The current output range is displayed.

2. Press the or key to select the desired output range. The relationship between the registered numbers and the output range for each sensor head is as follows:

Model Registered number

0 2.5 5 50 100 1 5 10 100 200 2 10 25 250 500 3 25 50 500 1000 4 50 100 1000 2000 5 100 200 2000 4000

PRM

key to turn ON the ANALOG RATIO indicator.

LC-2420 LC-2430 LC-2440 LC-2450

Signal output

0 V

(Unit: µm/V)

Note

To change the analog ratio using the RS-232C interface, transmit the registered number corresponding to the desired output range from an external device to the LC.

CHAPTER 8 External Input/Output

8-3 Monitor Output (Standard Equipment) 8-4 DIGITAL I/O (Standard Equipment on Control Unit)

Note

To interrupt entry of the analog ratio, press the the key several times until the LC returns to the measurement mode.

PRM

Any new parameter settings are ignored, and the LC returns to the measurement mode.

3. Press the key. The specified analog ratio is entered, and the LC returns to the measurement mode.

Intensity Monitor Output

The LC outputs an analog voltage proportional to the intensity.

Signal output

Output range: 0 to + 5 V Output impedance: 0 Ω

0 V

Current capacity: 10 mA

BNC connector

Note

• The intensity monitor output range is 10000/V for all sensor head models

• When an error message is displayed, the output voltage is retained to 0 V.

8-4 Digital I/O (Standard Equipment on Control Unit)

Cannot be used with the LC-2400W series.

key, and then press

Specifications

The digital I/O function can be used when the control unit is used separately. Displacement and intensity measurement values and alarm signals for indicating abnormal measurement conditions are output as digital signals.

Output

TTL level (74LS652 or equivalent)

+5 V

3 kΩ

OUTQD

6.2 kΩ

Input

TTL level (74LS19 or equivalent)

+5 V

CHAPTER 8 External Input/Output

3 kΩ

I N

6.2 kΩ

8-4 DIGITAL I/O (Standard Equipment on Control Unit)

Output Signal

Displacement data output

The displacement data output signal is a positive logic signal in the form of a 16-bit twos complement binary numbers representing displacement measurement values. When the number of averaging measurements is set to between 1 and 2048, the displacement data is output every 20 µs.

Sensor head Displacement data output

LC-2420 1LSB = 0.01 µm LC-2430 1LSB = 0.02 µm LC-2440 1LSB = 0.2 µm LC-2450 1LSB = 0.5 µm

Intensity data output

The intensity data output signal is a positive logic signal in the form of 16-bit twos complement binary numbers representing intensity. For all sensor head models: 1LSB= 2

Strobe (STB)

The strobe signal is output to specify data output timing. It is a negative logic signal with a pulse duration of approx. 6 µs. The strobe signal goes LOW approx. 1.6 µs after the measurement data output signal is prepared.

Alarm output

The LC alarm signal output is LOW.

Input Signal

Note

Alarm (OR logic)

All alarm outputs except for [GO] are ORed. The alarm signal goes LOW when at least one alarm signal is output.

External trigger enable input (ETE IN)

When the external trigger enable input (ETE IN) is LOW and the external trigger input (EXT TRIG IN) signal is received, the LC outputs measurement data at a specified frequency.

Input

HI (The input is HIGH even if the input pin is open.)

ETE IN

LOW Measurement data is output

When the number of averaging measurements is set to between 1 and 2048, measurement data is output every 20 µs. When the number of averaging measurements is set to 4096 or more, measurement data is output at the following frequencies.

Level Output

When the number of averaging measurements is set to between 1 and 2048, measurement data is output every 20 µs.

only when the external trigger input (EXT TRIG IN) signal is received.

CHAPTER 8 External Input/Output

8-4 DIGITAL I/O (Standard Equipment on Control Unit)

Number of averaging measurements Frequency

Figures in ( ) apply when the ADD or SUB function is selected.

Timing chart

1. When the ETE IN signal is HIGH:

Displacement/ intensity data Alarm

1 to 2048 20 µs (40 µs)

4096 40 µs (80 µs)

8192 80 µs (160 µs) 16384 160 µs (320 µs) 32768 320 µs (640 µs) 65536 640 µs (1280 µs)

131072 1280 µs (2560 µs)

20 µs

Note

STB

1.6 µs

Approx.

6.4 µs

The strobe (STB) signal is output at a frequency of 20 µs, regardless of the number of averaging measurements.

2. When the ETE IN signal is LOW:

1 µs min.

EXT TRIG IN

Displacement/ intensity data

❋

Alarm output

STB

30 µs max.

CHAPTER 8 External Input/Output

Note

1.6 µs

Approx.

6.4 µs

* When the ETE IN signal is LOW and the number of averaging measure-

ments is set to between 1 and 2048, the alarm signal is output every 20 µs (40 µs), regardless of the EXT TRG IN signal level.

• Data in ( ) apply when the ADD or SUB function is selected.

Pin Names and Functions

8-4 DIGITAL I/O (Standard Equipment on Control Unit)

External trigger input (EXT TRIG IN)

When the ETE IN signal is LOW, measurement data is output a maximum of every 30 µs. After the EXT TRG IN signal goes LOW. The output data is retained until the EXT TRIG IN signal goes LOW again.

DIGITAL I/0

Pin No. Signal name

1 Displacement data output DBIN1

(LSB) 2 Displacement data output DBIN2 3 Displacement data output DBIN3 4 Displacement data output DBIN4 5 Displacement data output DBIN5 6 Displacement data output DBIN6 7 Displacement data output DBIN7 8 Displacement data output DBIN8 9 Displacement data output DBIN9

10 Displacement data output DBIN10 11 Displacement data output DBIN11 12 Displacement data output DBIN12 13 Displacement data output DBIN13 14 Displacement data output DBIN14 15 Displacement data output DBIN15 16 Displacement data output DBIN16

(MSB)

17 OPEN 18 0 V (for ±5 V) 19 OPEN 20 * 21 * 22 * 23 OPEN 24 OPEN 25 +5 V 26 +5 V 27 +15 V 28 +15 V 29 0 V (for ±15 V) 30 -15 V 31 -15 V

Pin No. Signal name

32 Earth ground terminal 33 Intensity data output IBIN1 (LSB) 34 Intensity data output IBIN2 35 Intensity data output IBIN3 36 Intensity data output IBIN4 37 Intensity data output IBIN5 38 Intensity data output IBIN6 39 Intensity data output IBIN7 40 Intensity data output IBIN8 41 Intensity data output IBIN9 42 Intensity data output IBIN10 43 Intensity data output IBIN11 44 Intensity data output IBIN12 45 Intensity data output IBIN13 46 Intensity data output IBIN14 47 Intensity data output IBIN15 48 Intensity data output IBIN16 (MSB) 49 * 50 * 51 * 52 * 53 * 54 * 55 * 56 * 57 +5 V 58 0 V ( for +5V) 59 0 V ( for +5 V) 60 +15 V 61 0 V (for ±15 V) 62 -15 V 63 -15 V 64 Earth ground terminal

ﬂ

Pin No. Signal name

65 Alarm output (HIGH) 66 Alarm output (LOW) 67 Alarm output (+ AREA OVER) 68 Alarm output (- AREA OVER) 69 Alarm output (BRIGHT) 70 Alarm output (DARK) 71 alarm output (ERROR) 72 Alarm output (GO) 73 Alarm (OR logic) 74 * 75 ETE IN (input) 76 * 77 EXT TRG IN (input) 78 STB (output) 79 * 80 * 81 * 82 * 83 * 84 * 85 * 86 * 87 * 88 * 89 +5 V 90 0 V (for +5 V) 91 0 V (for +5 V) 92 +15 V 93 0 V (for ±15 V) 94 0 V (for ±5 V) 95 Earth ground terminal 96 Earth ground terminal

* Through the reserve pins (pin Nos. 49 to 56, and 79 to 88), input signals

from the display unit are received. When the control unit is used separately, the reserve pins must remain open (without connection to any device).

CHAPTER 8 External Input/Output

CHAPTER 9

APPENDIX

9-1 Trouble-Shooting Guide ................................................80

9-2 Hints on Highly Accurate Measurement ........................83

9-3 Specifications ................................................................84

9-4 Dimensions....................................................................85

9-5 Characteristics...............................................................87

9-6 Initial Setting List ...........................................................89

9-7 Glossary ........................................................................90

9-8 Expansion I/O ................................................................94

9-9 Index............................................................................111

9-1 Trouble-Shooting Guide

If the LC series does not display a measurement value or displays an inaccurate measurement value, or if an error occurs during communication with external equipment, refer to the following list to identify the problem and reinstall or readjust the LC. If the LC does not work properly after taking the appropriate actions, please contact KEYENCE.

Troubleshooting

Problem Cause Action

Nothing is displayed on the display panel.

"- - - -" is displayed on the display panel.

Measurement value fluctuates.

The key-operated power switch is turned OFF.

The power switch on the rear panel is turned OFF. (LC-2400W only)

The power supply cable is disconnected.

The fuse is blown. The power has just been

switched on or a parameter setting has been just changed.

Measurement error has occurred.

The transmitter/receiver of the sensor head is not clean.

The preset gain is not correct. Set the gain to a correct value. The preset number of averaging

measurements is too small.

Turn ON the key-operated power switch.

Connect the power supply cable.

Replace the fuse. No problem

Refer to the "Error Message List" for appropriate actions.

Wipe the dust off the transmitter/ receiver.

Set the number of averaging measurements to an appropriate value.

Reference

page

p.12

p.14

p.22

–

p.82

p.18

p.30

p.36

Inaccurate measurement value is displayed.

CHAPTER 9 Appendix

The measurement point is not clean.

The sensor head orientation is not correct.

The sensor head or target is tilted.

The control unit and the sensor head have different serial numbers.

performed. The sensor head or target is

tilted.

The target is out of the measuring range.

The preset measurement mode is not correct.

Wipe the dust off the measurement point.

Make sure that the sensor head orientation is correct.

Check the sensor head and target setup positions.

Use the control unit and sensor head having the same serial number.

Re-calibrate.Calibration was improperly

Check the sensor head and target setup positions.

Set the measurement mode properly according to the setting.

–

p.25

p.22

p.32

p.25

p.30

9-1 Trouble-Shooting Guide

Problem Cause Action

Analog output voltage exceeds 10 V.

Analog output value is not correct.

The measurement mode is set to INTENSITY.

OFFSET value is entered.

The preset mode is not correct.

The transmitter/receiver of the sensor head are not clean.

The measurement point is not clean.

An error message is displayed. Referring to the "Error Message

The analog output voltage exceeds the specified output range.

The preset analog ratio is not correct.

Press the the measurement mode to DISPLACEMENT.

Make sure that the OFFSET value is correct.

Be sure to choose the correct display/output mode.

Wipe the dust off the transmitter/ receiver.

Wipe the dust off the measurement point.

List", take the appropriate actions.

Make sure that the preset analog ratio is correct.

Make sure the preset analog ratio is correct.

INTENSITY

key to change

Reference

page

p.29

p.35

p.31

p.18

–

p.82

p.73

The LC cannot communicate with the external device connected to the RS-232C connector.

A null modem cable was used. Use a standard serial cable.

The preset baud rate is not correct.

The preset data format is not correct.

The transmitted character or ASCII code is not correct.

Set the baud rate and data format to that of the external device.

Transmit the correct character or ASCII code.

p.50

p.51

p.67

CHAPTER 9 Appendix

9-1 Trouble-Shooting Guide

Error Message List

Display

Error

message

Measurement error

Insufficient intensity

Intensity too high Intensity is too high. Make sure that the HIGH-INTENSITY

+ AREA OVER The sensor-to-target

- AREA OVER The sensor-to-target

Calibration error The output value

Cause Action

The measurement value exceeds the specified output range.

Intensity is insufficient or the laser beam shield is closed.

distance is too long.

distance is too short.

exceeds the specified calibration range.

Change the OFFSET value and the sensor head and target setup positions so that the measurement value does not exceed the specified output range.

Make sure that the LOW-INTENSITY LIMIT and gain are set to correct values in relation to the intensity. Make sure that the laser beam shield is opened.

LIMIT and gain are set to correct values in relation to the intensity.

Check the sensor head and target setup position.

Re-calibrate.

Reference

page

p.25 p.35

p.4 p.30 p.37

p.30 p.37

p.25

p.32

BAUD RATE LED is flashing

Filter setting error The preset CUTOFF

frequency is not correct.

Connection error Pins 1 and 2 of the

LASER REMOTE connector are not shorted. No sensor head is connected. The connecting cable is disconnected.

GP-IB error The GP-IB board is

not properly connected to the GP-IB connector.

Battery error Memory back-up

battery is exhausted.

Note

"Far" and " Near" are displayed when the sensor-to-target distance exceeds the measuring range by at least 5%.

Example: When using the LC-2440: "Far" is displayed when the sensor-to-target distance exceeds the measuring range by at least + 3.3 mm.

Set the CUTOFF frequency to 0100 or more.

Reconnect the sensor head. Short the LASER REMOTE connector pins 1 and 2 by connecting the LASER REMOTE input connector to the LASER REMOTE connector. Check that the connecting cable is not disconnected.

Install the GP-IB board properly to the GP-IB connector.

Replace the battery.

p.36

p.15 p.22

p.24

p.19

CHAPTER 9 Appendix

"Near" is displayed when the sensor-to-target distance exceeds the measuring range by at least - 3.3 mm.

9-2 Hints on Highly Accurate Measurement

This section describes the measurement conditions for improving the LC2400 series measurement accuracy.

9-2 Hints on Highly Accurate Measurement

Performance of the LC-2400 Series

How to Improve the Measurement Accuracy

The resolution given in the LC specifications was obtained under the following conditions:

• A regular-refective object (for LC-2420/LC-2430) or white diffuse-reflective object (for LC-2440/LC-2450) was used as the target. Sufficient intensity was received.

• The number of averaging measurements was set to 512.

• Each target was measured in static conditions.

As the number of averaging measurements and the intensity level were reduced, the resolution was reduced. The resolution was also reduced when measuring a moving target with an uneven surface such as a metal-worked or hair-line finished target. For example, when measuring the surface runout of a hair-line finished rotating disk, the resolution is reduced. Linearity is also reduced under such conditions.

Under the following conditions, the LC enables highly accurate measurements using a target with an uneven surface such as a hair-line finished target.

• Increase the intensity. Apply a white acrylic resin board or mirror-surfaced object to the measurement point to increase the intensity.

• Increase the laser beam diameter. Place a target at the end of the measuring range to increase the laser beam diameter. When using the LC, for example, set the sensor-to-target distance to 28 mm or 32 mm. In this case, be sure to place the target within the measuring range.

• Increase the number of averaging measurements. As the number of averaging measurements is increased, the response frequency is reduced. Be sure to set the number of averaging measurements to an appropriate value in relation to the target travel speed.

Number of averaging measurements vs. response frequency Response frequency (Hz) = * The response frequency is defined as the value when the analog output

level is 3 dB lower than the stable level.

For other methods for improving the measurement accuracy, consult KEYENCE.

Number of averaging measurements

20000

CHAPTER 9 Appendix

9-3 Specifications

Model Controller LC-2400A/LC-2400W/LC-2401

Sensor head LC-2420 LC-2430 LC-2440 LC-2450

Measuring range ±0.2 mm ±0.5 mm ±3 mm ±8 mm

Operating distance 10 mm 30 mm 30 mm 50 mm

Light source Visible red semiconductor laser, Maximum output 1.8 mW, Pulse duration: 10 µs

Wavelength 670 nm

Class FDA (CDRH) Class ΙΙ

IEC/EN 60825-1: 1993 + A2: 2001 Class 2

DIN EN 60825-1 2001 Klasse 2

Minimum spot diameter 20 x 12 µm 30 x 20 µm 35 x 20 µm 45 x 20 µm

Resolution

Linearity

Sampling frequency 50 kHz

Response frequency 20 kHz (- 3 dB, Number of averaging measurements: 1)

Response time 100 µs

Number of averaging measurements 1 to131072 (18 selectable settings)

OFFSET range ±199.99 µm ±499.98 µm ±2.9998 mm ±7.9995 mm

Gain adjustment AUTO/MANUAL (4 settings)

Analog output Displacement data output ± 10 V, Output impedance: 0 Ω, 6 settings, Resolution: 5 mV

Digital I/O

Control I/O

Interface RS-232C Displacement/intensity data output and control input

Measuring stability (±5°C (±9°F))

Power supply voltage 100 to 240 VAC ±10%, 50/60 Hz

Fuse 250 V ~ 3.15 A FAST High Breaking

Power consumption 70 VA max.

Ambient temperature 0 to 40°C (32 to 104°F), No condensation

Relative humidity 35 to 85%, No condensation

Noise 70 dB max.

Weight Sensor head Approx. 500 g Approx. 250 g

1, 2: When using a standard specular-reflective object (LC-2420/LC-2430) or white diffuse-reflective object (LC-2440/LC-2450) as a target and the number of

3: The 96-pin connector can be used only when the control unit is used separately. Cannot be used with the LC-2400W. 4, 5: Optionally available for LC-2400A only. Contact us for details. 6: The data was obtained when the standard target and the sensor head were fixed to a steel plate (LC-2420/LC-2430) or an aluminum plate (LC-2440/LC-

LC-2400A/LC-2400W 0.01 µm 0.02 µm 0.2 µm 0.5 µm

LC-2401 0.32 µm 0.4 µm 0.5 µm

LC-2400A/LC-2400W ±0.05% of F.S.

LC-2401 ±0.1% of F.S. ±0.05% of F. S.

Intensity data output 0 to 5 V, Output impedance: 0 Ω

96-pin connector

Displacement

data output

LC-2400A/ TTL level, positive logic

LC-2400W 1LSB=0.01 µm 1LSB=0.02 µm 1LSB=0.2 µm 1LSB=0.5 µm

LC-2401 TTL level, positive logic

Intensity data output TTL level, positive logic, 1LSB = 2

Control input TTL level, negative logic [Output timing]

Control output TTL level, negative logic

50-pin connector

Displacement

data output

LC-2400A/ 16-bit parallel NPN open-collector, negative logic

LC-2400W 1LSB=0.01 µm 1LSB=0.02 µm 1LSB=0.2 µm 1LSB=0.5 µm

LC-2401 Paralle NPN open-collector, negative logic

Intensity data output 16-bit parallel NPN open-collector, negative logic 1LSB=2

Control input TTL level, negative logic [Output timing]

Control input Non-voltage input (contact, solid-state)

Control output NPN open-collector, 100 mA (30 V) max.

GB-IB

Controller Approx. 6.8 kg (Approx. 2 kg, not including the display unit)

averaging measurements is set to 512:

2450). (20°C (68°F) as reference temperature)

1LSB=0.32 µm 1LSB=0.4 µm 1LSB=0.5 µm

[Upper/lower limit, INTENSITY alarm, AREA OVER alarm]

11 bits 12 bits 15 bits 16 bits

1LSB=0.32 µm 1LSB=0.4 µm 1LSB=0.5 µm

[HOLD timing input, AUTO-ZERO ON/OFF input, Program selection input,

1CH/2CH selection input, LASER REMOTE input]

[Upper/lower limit output, Intensity alarm output,AREA OVER alarm output]

(baud rate: 75 to 19200 bps selectable)

Displacement/intensity data output and control input

±0.2% of F.S. ±0.03% of F.S.

(when using the control unit separately; ±15 VDC ±3%, 0.5 A, +5 V±5%, 3 A)

CHAPTER 9 Appendix

9-4 Dimensions

Display Unit (LC-D1A/LC-D1W)

110

123

234 320

Control Unit (LC-C1A/LC-C1W/LC-C2)

Control Unit LC-C1A

215

207.4

1.5

• Front view

(47)

[Unit: mm]

232

297

5.4

255.4

29.1

159

67.2

5.2

3.4

194.5

230.2

166.7

4 x M 5

194

3.4

• Top view

15.2

2 x ø4.5

199

29.2

12.2

• Bottom view

89.8

4 x M5

120

29.2

180.2

237

• Rear view

CHAPTER 9 Appendix

9-4 Dimensions

Sensor head LC-2420/LC-2430 Regular-reflective

Model LC-2420 LC-2430 Reference distance (X) 10.5 30.5 Angle formed by transmitted 63° 45°

and received beams (θ)

58.5

ø10

1.5

6170

0.5

(X – 0.5)

12.5

4.5

0.5

45.5

22.5

22.2

35.5 36

17.8

5.5

ø7 Cable length: 20 cm

3 x ø 4.5

(Mounting hole)

[Unit: mm]

LC-2440/LC-2450 Diffuse-reflective

Model LC-2440 LC-2450 Reference distance (X) 30.5 50.5 Angle formed by transmitted 30° 22°

and received beams (θ)

58.5

ø10

1.5

70 55.5

0.5

(X – 0.5)

12.5

452

15.5

0.5

ø7

Cable length: 20 cm

3 x ø4.5

(Mounting hole)

Connecting Cable (Model: OP-21412)

58.8

ø7, Cable length: 3 m

CHAPTER 9 Appendix

9-5 Characteristics

+0.5° ±0.5°

Measurement value (µm)

Distance (µm)

±2 µm

200

•LC-2420 (Longitudinal direction with respect to the target inclination)

(Target: Block gauge)

±200

+0.5°

±0.5°

0.8 µm

200

±200

•LC-2420 (Traversal direction with respect to the target inclination)

(Target: Block gauge)

Measurement value (µm)

Distance (µm)

+10° ±10°

+10°

±10°

±10 µm

+10°

±10°

10 µm

±3

±33

±3

Measurement value (mm)

Distance (mm)

• LC-2440 (Longitudinal direction with respect to the target inclination)

(Target: Standard white diffuse-reflective object)

• LC-2440 (Traversal direction with respect to the target inclination)

(Target: Standard white diffuse-reflective object)

Measurement value (mm)

Distance (mm)

Measurement Error due to Target Inclination (Typical)

9-5 Characteristics

• LC-2430 (Longitudinal direction with respect to

(Target: Block gauge)

the target inclination)

+0.5°

±0.5°

±600 600

Measurement value (µm)

600

±600

Distance (µm)

+0.5° ±0.5°

• LC-2430 (Traversal direction with respect to

(Target: Block gauge)

±5 µm

the target inclination)

±0.5°

±600

Measurement value (µm)

600

+0.5° ±0.5°

2 µm

600

Distance (µm)

CHAPTER 9 Appendix

9-5 Characteristics

Distance vs. Spot Diameter (Typical)

Spot diameter

Receiver

Tr ansmitter

• LC-2450 (Longitudinal direction with respect to

(Target: Standard white diffuse-reflective object)

• LC-2420

[µm]

the target inclination)

+10°

±10°

±12 12

Measurement value (mm)

±12

+10°

±10°

±25 µm

Distance (mm)

Spot diameter

• LC-2450 (Traversal direction with respect to

(Target: Standard white diffuse-reflective object)

• LC-2430

[µm]

the target inclination)

±10°

±12

Measurement value (mm)

±12

+10° ±10°

30 µm

Distance (mm)

(Regular-reflective type)

Receiver

Tr ansmitter

(Diffuse-reflective type)

Ta rget

Distance from the center of the measuring range

Spot diameter

[µm]

300

200

100

±200 +2000

• LC-2440

[µm]

Spot diameter

±500 +5000

Distance from the center of the measuring range

• LC-2450

[µm]

400

300

200

100

[µm]

CHAPTER 9 Appendix

±3+3

Distance from the center of the measuring range

[mm]

±8+8

Distance from the center of the measuring range

[mm]

9-6 Initial Setting List

9-6 Initial Settings List

Sensor head LC-2420 LC-2430 LC-2440 LC-2450

Offset 0 Low-intensity limit 50 High-intesity limit 49750 Low-intensity limit time 0 ms High-intensity limit time 0 ms Gain AUTO Number of averaging measurements Measurement mode NORMAL Auto-zero OFF Filter OFF Cutoff frequency 100 Hz Baud rate 1200 bps Data format 8 bits, Parity check: None, Stop bit length: 1 bit

(Display panel: )

Upper/lower limits in each mode +200.00 µm +500.00 µm +3.0000 mm +8.0000 mm

-200.00 µm -500.00 µm -3.0000 mm -8.0000 mm Calibration 200.00 µm 500.00 µm 3.0000 µm 8.0000 µm Analog ratio 50 µm/V 100 µm/V 1000 µm/V 2000 µm/V Digit suppress Full Function 1CH

2048

Initializing the LC-2400 Series

Note

Follow the procedure below to reset the LC to initial settings.

When you initialize your LC, all settings stored in programs will also be deleted.

[LC-2400A series]

• Turn the power OFF.

• Turn the power ON while pressing and holding the key.

• The LC will be initialized and reset to the above initial settings. [LC-2400W series]

• Turn the power switch at the rear of the controller off.

• Turn the key-operated switch to the ON position while pressing and holding the key.

• The LC will reinitialize with the delfault settings shown above.

CHAPTER 9 Appendix

9-7 Glossary

Resolution The LC series outputs a target displacement value by detecting the displace-

ment of the laser beam reflected on the target surface. The S/N ratio of the electric signal generated by the beam displacement varies depending on the intensity of the received laser beam. The displacement output value fluctuates due to internal noise. The amount of the fluctuation is called resolution.

Linearity Ideally, the displacement output from the LC would be identical to the target

displacement, and the relationship between the output value and the target displacement would be represented by a straight line. Actual measurements, however, deviate slightly from the ideal line. The tolerance range in relation to the ideal line is called linearity.

Sampling Frequency

Response frequency

Taeget displacement

Actual measurement

Sampling frequency is defined as the number of samples taken per second.

If a target rotates or oscillates above a certain frequency, the LC cannot

Linearity

Displacement measurement value

Ideal line

detect the target displacement. Response frequency is defined as the frequency when the output level is 3 dB lower than (approx. 70% of) the stable level.

Response Time Response time is defined as the time required for output voltage to reach ±

10% of the stable level when a target instantaneously moves between two points.

Operating Distance Operating distance is defined as the distance between the front face of the

sensor head and the middle of the measuring range.

CHAPTER 9 Appendix

9-7 Glossary

Calibration Calibration is performed to compensate for the measurement deviation from

the ideal line that is caused by the difference in target color, material and surface condition. For example, the LC may output 1.990 mm, although actual displacement is 2.000 mm. This deviation results from differences in the target surface, since the laser beam reflects differently depending on the target surface. This is a characteristic of sensors using the principle of laser beam reflection. By calibrating, the measurement deviation between two measurement points can be corrected. The amount of deviation between two measurement points varies depending on the linearity for each target.

Number of Averaging Measurements

Linearity when measuring an actual target

Deviation

Measurement value

Point B

Before calibration After calibration

Deviation

Point A

Ideal line

Target displacement

Measurement value

Point B

Point A

Target displacement

The LC samples 50000 pieces of data per second to output measurement values. By averaging the sample data, fluctuation of measurement values can be reduced. The averaging methods are as follows:

Number of Averaging method

averaging measurements

1 to 2048 Moving average of one sampling

4096 to 131072 Moving average of N samplings

Number of averaging measurements

N =

2048

Example: Number of averaging measurements: 16 (Shifting one measurement before each new average)

Sampling 1, 2, 3, 4,

20 µs x Number of

averaging measurements

Measurement output timing

.......... ......

15, 16, 17, 18, 19,

12 3 4

123

20 µs20µs20µs

CHAPTER 9 Appendix

9-7 Glossary

LOW-INTENSITY LIMIT TIME = t DARK mode = t'

Intensity monitor output

LOW-INTENSITY LIMIT

Response time

t > t" (Example) Analog displacement output

Response time

Response time+data time sampling time

HIGH-INTENSITY LIMIT

( 100 µs max.)

+10V

(100 µs max. ) + (20 µs x Number of averaging measurements)

t < t' (Example) Analog displacement output

( 100 µs max.)

Example: Number of averaging measurements: 4096 (Shifting "N" measurements

before each new average: N = = 2)

4096

2048

HIGH-INTENSITY LIMIT/LOWINTENSITY LIMIT

Sampling 1, 2, 3, 4, 5, 6,

.......... .....

4096, 4097, 4098, 4099, 4100, 4101,

12 3

20 µs x Number of

averaging measurements

Measurement output timing

20 µs x N 20 µs x N

The LC is set to the DARK mode 100 µs max. after the intensity monitor output falls below the LOW-INTENSITY LIMIT. Then, the LC returns to the measurement mode 100 µs max. + (20 µs x Number of averaging measurements) after the intensity monitor output exceeds the LOW-INTENSITY LIMIT.

HIGH-INTENSITY LIMIT

Intensity monitor output

LOW-INTENSITY LIMIT

Response time Response time+data time sampling time

+10V

(Example) Analog displacement output

( 100 µs max.)

DARK mode

(100 µs max. ) + (20 µs x Number of averaging measurements)

INTENSITY LIMIT TIME

CHAPTER 9 Appendix

Note

When the intensity monitor output exceeds the HIGH-INTENSITY LIMIT, measurement data is output at the same timing as above.

The BRIGHT and DARK modes can be canceled for a specified time duration. This duration is called the INTENSITY LIMIT TIME. The INTENSITY LIMIT TIME can be set individually for the BRIGHT and Dark modes. Using the INTENSITY LIMIT TIME, a measurement value just before the BRIGHT or DARK mode is retained for a specified time duration.

9-7 Glossary

When the LOW-INTENSITY LIMIT TIME (t) is longer than the DARK mode time (t’’), the LC returns to the measurement mode 100 µs max. after the intensity monitor output exceeds the LOW-INTENSITY LIMIT.

Note

As for the HIGH-INTENSITY LIMIT TIME, measurement data is output at the same timing as above.

CHAPTER 9 Appendix

KEYENCE LC-2400 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual