Banner L-GAGE LT7 User Manual

L-GAGE® LT7 Long-Range Time-of-Flight Laser Sensor

Self-contained retroreflective- and diffuse-mode laser distance sensors

Features

• Extremely long range: diffuse model up to 10 m with white target, up to 7 m with
gray target, up to 3 m with black target; up to 250 m for retroreflective models

• Visible pilot laser for easy alignment

• Multiple outputs in each model: discrete outputs can be used for precision
background suppression; and alarm outputs together with display provide easy
troubleshooting

• Diffuse models: Two discrete (PNP) plus 2 alarm outputs, and 4-20 mA analog

• Retroreflective models: Two discrete (PNP) plus 2 alarm outputs

• Fast, easy-to-use TEACH-mode programming via integrated push-buttons or serial
interface (no potentiometer adjustments)

• Ongoing LCD display of sensing distance (selectable in hundredths of an inch
or millimeters)

• RS422- or SSI-compatible serial connection options

Models

Sensing

Models

LT7PIDQ Diffuse

LT7PLVQ Retroreflective

Mode

Laser
Class Cable*

Class 2
Pilot Laser, Class
1 Sensing Laser

Integral
12-pin
M16 QD
connector

Sensing
Range**

0.5 to 10 m
(20" to 33')

0.5 to 250 m
(20" to 820')

Supply
Voltage

18 to
30V dc

* Requires a mating cable; see page 20.

** Diffuse-mode range specified using a 90% reflectance white card.

Retroreflective-mode range specified using the appropriate specified retro target; see page 22.

Discrete
Outputs

2 PNP
plus
2 Alarm

Analog
Output Serial

4-20 mA

RS422
or SSI

N/A

WARNING . . . Not To Be Used for Personnel Protection

Never use these products for personnel protection. Doing so could lead to serious injury or death.

These products do NOT include the self-checking redundant circuitry necessary to allow their use in personnel safety applications. A failure or malfunction can cause either an
energized or de-energized output condition. Consult your current Banner Safety Products catalog for safety products that meet OSHA, ANSI, and IEC standards for personnel
protection.

Printed in USA June 2013 P/N 120244 Rev. B

L-GAGE® LT7 Long-Range Time-of-Flight Sensor

ESC

Diffuse

Overview

The sensor has an LCD display and 3 push buttons, which control all programming
functions. Serial interface programming can also be accomplished, via SSI or RS422.

Four status indicator LEDs on the sensor front/top provide ongoing status of power and
outputs.

Button Functions

• Run mode: Switches from Run mode to Programming mode

• Programming mode: Selects function and switches one menu level down

• Programming mode: Records value and switches one menu level up

Enter

Left Arrow

Right Arrow

Left and right

arrow buttons

simultaneously

• Manual adjust: Moves cursor one position to left or ends entry when cursor is
at the far left.

• Run mode: Press to light display

• Programming mode: Scrolls to the next menu position to the left (Figure 7)

• Manual adjust: Decreases current digit by 1

• QuickSet menu: Enables teach-in of Q1

• Run mode: Press to light display

• Programming mode: Scrolls to the next menu position to the right (Figure 7)

• Manual adjust: Increases current digit by 1

• QuickSet menu: Enables teach-in of Q2

• Escape: Cancels active function and switches to one menu level above (Figure

7) without saving new values

• Important: Both arrows must be pressed simultaneously. Previous value is
unchanged.

Status
Indicator
LEDs

2-line
Digital
Display

Programming
Push Buttons

Figure 1. Sensor features

The sensor has a 2-line LCD display and 4 LED indicators for ongoing indication of
sensing status: Power ON, Alarm, and Outputs 1 and 2.

In Run mode, the current measured value is displayed in the top line of the sensor’s
display, in millimeters or hundredths of an inch, as selected.

Sensing Options

Sensing Beam. The sensor uses an infrared Class 1 laser for sensing, and a visible red

Class 2 laser (or Pilot laser) for alignment. Both lasers are aimed at the identical target
spot. The laser beams are collimated to focus a compact spot, even at long sensing
distances (see Figure 2).

Retroreflective

10 m

4 x 12 mm

10 m

Ø 20 mm

50 m

10 x 20 mm

Ø 100 mm

100 m

Ø 200 mm

Ø 500 mm

250 m

10 x 5 mm

10 x 5 mm

3 x 10 mm

4 m

6 m

Figure 2. Light spot dimensions

2 P/N 120244 Rev. B

Banner Engineering Corp. • Minneapolis, MN U.S.A

www.bannerengineering.com • Tel: [phone]

L-GAGE® LT7 Long-Range Time-of-Flight Sensor

Discrete Outputs (Q1 and Q2) –

Single-point switching

Normally Closed

Normally Open

Two-point switching

Normally Closed

Normally Open

Hysteresis: Manually adjustable in ± 1 mm steps,
symmetrically around the switching point.
(If upper limit is reached, limit value of
measurement range becomes the upper limit.)

Analog Output (model LT7PIDQ only) –

NOTE: Analog A1 and A2 must be at least 300 mm apart.

A2

Mode 1 – Positive Slope

Mode 2 – Negative Slope

Two main TEACH methods:

• Individually teach A1 and A2 limits via manual input.

• Copy Discrete Output limits to Analog.

A1

A1

A2

Figure 3. Teach-mode options for each

output

Output 1

Output 2

Near

Sensing

Range

Figure 4. Each discrete output has its own limit for

background suppression

Output 1

Output 2

Near

Sensing

Range

Figure 5. The two discrete outputs share identical limits

for background suppression, but are
complementary

Point Q1.1

Teach

Point Q2.1

Teach
Point

(Q1.1 and

Q2.1 are

identical)

Teach

Far

Sensing

Range

Far

Sensing

Range

Password. A Password function is included to provide a measure of security for the
sensor settings. If Password is set to ON, the password must be entered before any
programming can take place. The password is always “1234”; it cannot be changed.
(The security results from the requirement to know the entry procedure and the timeout
function. If the password is not entered within approximately 10 seconds, the sensor will
return automatically to Run mode.) Measuring continues in the “background” while the
password is entered).

Select measurement in millimeters or inches (actually, hundredths of an inch. To “see”
whole inches on the display, imagine a decimal point on the display, two spaces in from
the right; see Figure 8).

Offset. An offset value can be entered or taught, which increases or reduces the measured
value, in order to compensate for a mounting position that does not correspond with the
zero point of the device. (For example, 3000 actual distance minus 1200 mm offset value
equals 1800 mm adjusted output value.) The offset value can be up to 100,000 mm (or
corresponding inch value); the plus or minus is also selectable. The offset value reverts to
0 if the factory preset function is used. The offset value applies equally to all outputs.

Factory Preset. Sensor easily reverts to factory preset conditions:
Teach-In –

Q1 and Q2 (Discrete) – single switchpoint (full sensing range), ± 5mm hysteresis
QA (Analog) – Mode 1, rising (positive slope, full sensing range)
Offset – 0
Unit – mm
Serial – RS422
Password – OFF

Multiple Outputs. The sensing distance can be taught using QuickSet, Teach-In, or by
manually entering the distance value(s). Either one or two sensing conditions may be
taught for each output (see Figures 4 and 5).

Discrete outputs: The two outputs may be configured identically or they may have
completely independent limits and configuration. One or two sensing conditions can be
taught for each. If one condition is taught, the output sets a switching threshold, around
which the selected hysteresis is applied. The two-point TEACH result differs, depending on
whether QuickSet or TEACH-IN is used to set the limits. In QuickSet, the sensor averages
the two taught values, then centers a 200 mm window around the averaged point (100
mm to each side). TEACH-IN window limits remain as taught; the window can be any
size. The selected hysteresis is applied to each threshold and window near limit and far
limit equally, no matter how they are taught.

Analog outputs: Analog limits 1 and 2 must be at least 300 mm apart. Individually teach
4 mA (A1) and 20 mA (A2) points or use the Copy function (selectable in the Analog
Output Mode menu) to copy the discrete limits (only the first limits of discrete 1 and 2) to
the analog output. (If copying Discrete limits to Analog, Discrete limits 1 and 2 must be
at least 300 mm apart, or sensor will not copy those limits.) The order in which they are
copied determines the analog output slope. For Mode 1 (positive slope) selected:

Q1, then Q2 – Limit Q1.1 becomes A1 (4 mA); Q2.1 becomes A2 (20 mA)

Q2, then Q1 – Limit Q1.1 becomes A2 (20 mA); Q2.1 becomes A1 (4 mA)

Manual Adjust: After Teach mode, Manual Adjust (or Edit) may be used to adjust the
value set for any output. It also can be used instead of Teach mode, to input a precise
limit value.

Banner Engineering Corp. • Minneapolis, MN U.S.A

www.bannerengineering.com • Tel: [phone]

P/N 120244 Rev. B 3

L-GAGE® LT7 Long-Range Time-of-Flight Sensor

Mode Q1

Teach-In

(Set Q1)

Teach 1.1

Teach 1.2

Hyst 1

Teach-In

(Setup)

Mode Q2

Teach-In

(Set Q2)

Teach 2.1

Teach 2.2

Hyst 2

Mode Analog

Teach-In

Analog

Copy Q>A

Teach A1

Teach A2

Q1

Q2

QuickSet

(Enter)

4564 mm

Q1 |||| q2

Run Mode

Main Menu

Unit

(MM)

Unit > mm

Unit > inch

Serial > SSI

Password (Required only

if Password option is ON.
Factory preset is Password
OFF.

• Visible Pilot Laser OFF.

• Measuring Laser ON.

• Press or to
light display backlight

• Visible Pilot Laser ON.

• Measuring Laser ON.

• Display backlight ON.

Use or to scroll
between Main Menu
selections.

Use or to
scroll between
selections.

or

or or

or

or

Offset

(0)

Offset nnnn

Offset > clear?

or or or or

*Ext. Bus requires specialized sensor; not currently available.

Output 1

Menu

Output 2

Menu

Analog Output

Menu

Theory of Operation

A short electrical pulse drives a semiconductor laser diode to emit a pulse of light. The
emitted light is collimated through a lens, which produces a very narrow laser beam.
The laser beam bounces off the target, scattering some of its light through the sensor’s
receiving lens to a photodiode, which creates an electrical pulse. The time interval
between the two electrical pulses (transmitting and receiving the beam) is used to
calculate the distance to the target, using the speed of light as a constant.

Multiple pulses are evaluated by the sensor’s microprocessor, which calculates the
appropriate position value. The outputs energize whenever the target is located between
the user-programmed window limits or when the preset switching threshold is crossed.
Outputs may be programmed for a variety of functions.

User

Interface

Microprocessor

Time-of-Flight

Engine

Output

Circuitry

Figure 6. Theory of operation

Emitter

Circuitry

Analog

Signal

Processing

Laser

Lenses Target

Emitter

E

R

Receiver
Element

Figure 7. Programming menu tree

4 P/N 120244 Rev. B

Banner Engineering Corp. • Minneapolis, MN U.S.A

www.bannerengineering.com • Tel: [phone]

DIST mm

1475

Sensor measures 1475 mm distance
to target.

L-GAGE® LT7 Long-Range Time-of-Flight Sensor

Sensor Programming

The sensor may be programmed using either the on-board push buttons along with the
sensor’s LCD display, or via a serial interface. For serial interface instructions, see page

14. Sensor TEACH-mode instructions follow.

From Run mode, press Enter
OFF (factory setting), the sensor will proceed to the Main menu (see Figure 7). When the
sensor enters Programming mode, several things occur:

to access Programming mode. If Password is set to

DIST in

32512

Sensor measures 325.12" distance
to target.

Figure 8. Run mode display

Imaginary
decimal
point

• Sensor display lights up.

• Visible red Pilot laser turns ON.

• Measurement laser remains ON, alternating with the Pilot laser.

• Sensor proceeds to QuickSet on the Main menu (see Figure 7).

QuickSet: The received energy value is displayed in the form of a bar graph (the more
bars, the stronger the received signal). Outputs Q1 and Q2 are indicated as ON or OFF by
the LED indicators on the front of the sensor, and whether the “Q” is capitalized on the
display (Q1 = output 1 ON; q1 = output 1 OFF), press
to output Q1, and press

to teach the current condition to Q2. (Other Teach properties

to teach the current condition

are programmed in the Teach-In menu.) To quit the menu, use either the Enter button or
the Escape function.

Manual Adjust: After Teach-In and pressing Enter

to save, press

or

to
activate Manual Adjust (or Edit) mode for any output. The cursor flashes below the right­hand digit of the display; press

or

to increase or decrease value by one unit.
Press

to save that digit and move cursor
to the next position left, and so on, until the
left-most digit is adjusted. Then press

to
adopt the manually adjusted value and switch
one menu level up.

Escape function: Press buttons

and
simultaneously to escape; sensor will go up
one menu level each time, and may not retain
new settings, depending on the programming
procedure.

Unit

(MM)

Unit > mm

Unit > inch

or or or

Banner Engineering Corp. • Minneapolis, MN U.S.A

www.bannerengineering.com • Tel: [phone]

P/N 120244 Rev. B 5

Serial

(RS422)

Serial > SSI

Serial > Ext. Bus*

*Ext. Bus requires specialized sensor; not currently available.

RS422

(see page 13)

Serial > RS422

Password

(OFF)

Password (OFF)

Password (ON)

Factory

(Preset)

Factory > OK

L-GAGE® LT7 Long-Range Time-of-Flight Sensor

Procedure Example Displays Result

QuickSet

From Run mode, press

<ENTER>

No Password

If password is not required (factory preset condition), sensor proceeds
to QuickSet on the Main menu (Figure 7).

From Run mode, press

Press

press

Press

Programming Mode

press

Press

button 4 times,* then

button 3 times, then

button twice, then

Password Required

press

Press

button once, then press

PASSWORD

_ _ _ _

Blinking

Cursor

PASSWORD

_ _ _ 4

PASSWORD

_ _ 3 4

PASSWORD

_ 2 3 4

PASSWORD

1 2 3 4

PASSWORD

OK!

Sensor waits for valid password (1234); cursor blinks on right-hand
digit. If no password is begun within 10 seconds, sensor returns
automatically to Run mode.

Sensor inserts a 4 in the right-hand digit, then moves blinking cursor to
third position.

Sensor inserts a 3 in the third digit, then moves blinking cursor to
second position.

Sensor inserts a 2 in the second digit, then moves blinking cursor to
first position.

Sensor displays completed password and OK message, then proceeds
to QuickSet on the Main menu.

* Either arrow button may be pressed;

6 P/N 120244 Rev. B

QuickSet

ENTER

button will decrease number by one each time.

Banner Engineering Corp. • Minneapolis, MN U.S.A

www.bannerengineering.com • Tel: [phone]

L-GAGE® LT7 Long-Range Time-of-Flight Sensor

q1 Q2

196

Main

Menu

QuickSet

Procedure Example Displays Result

QuickSet
Press
through Main menu options

With QuickSet visible on the

display, press

Press

<ENTER>

condition to Output 1.

Press
condition Output 2.

Press
– or –
Use Escape function*

or

to teach current

to teach current

to scroll

Bars indicate a strong signal

TEACH IN

OFFSET

UNIT

SERIAL

RS422

PASSWORD

FACTORY <PRESET>

QuickSet

<ENTER>

196 mm to target

Output 1 OFF

Output 2 ON

Sensor scrolls through Main menu options.
See following steps for procedures if other than QuickSet is
selected.

Sensor enters QuickSet program.

Current measured value is displayed on top line; received energy
value is indicated by bar graph (the more bars, the stronger the
received signal). Outputs Q1 and Q2 are indicated as ON or OFF by
the LED status indicators and by whether the “Q” is capitalized on
the display (Q1 = Output 1 ON; q1 = Output 1 OFF).

Sensor saves settings and returns to Main menu.

* Escape function available throughout Programming mode; returns sensor one step higher in menu.

Banner Engineering Corp. • Minneapolis, MN U.S.A

www.bannerengineering.com • Tel: [phone]

P/N 120244 Rev. B 7

L-GAGE® LT7 Long-Range Time-of-Flight Sensor

Main

Menu

Procedure Example Displays Result

Press
menu.

Press
through output options.

Press
output.

Press
through options for Output 1.

Press
options.

Press
through options.

to enter TEACH-IN

or

to scroll

to select displayed

or

to scroll

to view output mode

or

to scroll

TEACH-IN

<SETQ1>

<SETQ1>
<SETQ2>

<ANALOG> (diffuse model only)

MODE Q1 Sensor displays current output and mode selections.

MODE Q1
TEACH1.1
TEACH1.2

HYST 1

MODE Q1 Sensor displays arrow to denote options can be viewed.

Sensor displays current output selected.

Sensor displays output options.

Sensor displays TEACH options for selected output.
See following steps for procedures if other than mode Q1.

Sensor displays output mode options.

TEACH-IN

Press
output mode.

to select displayed

(Setup) – Discrete

Press
through options for Output 1.

Press
option.

TEACH1.1

Press
condition.

Manual Adjust

Press
Adjust.

Press
or increase value of each digit.

Press
one digit left.

When cursor is at left-hand digit

or

to select displayed

to teach target

to access Manual

or

to select and move

to scroll

to decrease

MODE Q1 Sensor saves selected option.

TEACH 1.1

< 203>

TEACH 1.1

203

TEACH1.1

<241>

TEACH1.1
241

Limit 1 value

Sensor again displays TEACH options for selected output.

Sensor is ready to learn limit 1.
Proceed by teaching limit 1.1 target condition or via Manual Adjust

Sensor saves limit 1 setting and returns to Output 1 menu level.

Blinking cursor indicates active digit (beginning with right-hand
digit).

Sensor saves setting and returns to Output 1 menu level.

and value is correct, press

8 P/N 120244 Rev. B

Banner Engineering Corp. • Minneapolis, MN U.S.A

www.bannerengineering.com • Tel: [phone]