Leuze electronic BCL 80 Parts list manual

Leuzeelectronic
Bar Code Reader BCL 80 with Integrated Decoder
Connector Unit MA 10
Technical Description
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All rightsreserved,especially the rights of production,distributionand translation.Duplication or reproduction in any form (print, photo-
copies,microfilm or data)mayonly be carried outwith the expressed written consent of Leuze electronic GmbH + Co.
We reserve the rightto make changes for the technical improvement of the product
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Leuze electronic Technical Description BCL 80 1
Leuzeelectronic Table of Contents
1 General Information...........................................................................................................3
1.1 Explanation of Symbols .......................................................................................................3
1.2 Definition of Terms...............................................................................................................3
1.3 Declaration of Conformity ....................................................................................................5
2 Safety Notices ....................................................................................................................6
2.1 Safety Standard ...................................................................................................................6
2.2 Intended Use........................................................................................................................6
2.3 Working Safety.....................................................................................................................6
2.4 Organisational Measures.....................................................................................................7
3 Description.........................................................................................................................8
3.1 The Bar Code Readers BCL 80...........................................................................................8
3.2 Features of the BCL 80........................................................................................................8
3.3 Construction.......................................................................................................................11
4 Technical Data..................................................................................................................13
4.1 General Technical Data.....................................................................................................13
4.2 Dimensioned drawings.......................................................................................................15
4.3 Optical Data .......................................................................................................................16
4.3.1 Type overview..............................................................................................................................17
4.3.2 Sweep principle ........................................................................................................................... 17
4.3.3 Reading Fields.............................................................................................................................18
4.3.4 Scanning curves of the BCL 80................................................................................................... 19
5 Accessories / Order Designation ...................................................................................21
5.1 Connector and interface unit MA 10 ..................................................................................21
5.2 Mounting accessories ........................................................................................................21
5.3 Cable accessories..............................................................................................................23
6 Installation ........................................................................................................................24
6.1 Storage, Transportation.....................................................................................................24
6.2 Mounting............................................................................................................................25
6.2.1 Types of Mounting.......................................................................................................................25
6.3 Proper Configuration of the Devices .................................................................................. 27
6.4 Connection.........................................................................................................................29
6.4.1 Connecting the BCL 80 for ’Stand Alone’ Operation....................................................................30
6.4.2 Connecting the BCL 80 with the Connector Unit MA 10..............................................................32
6.4.3 Wire Lengths and Shielding......................................................................................................... 39
6.4.4 Disassembling, Packing, Disposing............................................................................................. 39
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2 Technical Description BCL 80 Leuze electronic
Table of Contents Leuzeelectronic
7 Commissioning ................................................................................................................40
7.1 Steps Before the First Commissioning...............................................................................40
7.2 Function Test.....................................................................................................................42
7.3 Setting the Parameters ......................................................................................................42
7.3.1 Service Operating Mode ..............................................................................................................44
7.3.2 Setting Parameters ’Offline’ (Loading)..........................................................................................46
7.3.3 Setting Parameters ’Online’..........................................................................................................46
7.3.4 Setting the Bar Code Parameters Using ’autoConfig’..................................................................47
8 Operation.......................................................................................................................... 48
8.1 Display Elements ...............................................................................................................48
8.2 Important Functions During Operation...............................................................................49
8.3 Error Handling....................................................................................................................49
9 Configuration ...................................................................................................................50
9.1 Overview of Commands and Parameters..........................................................................50
9.1.1 General ’Online’ Commands ........................................................................................................51
9.1.2 ’Online’ Commands for System Control .......................................................................................54
9.1.3 ’Online’ Commands for System Testing.......................................................................................55
9.1.4 ’Online’ Commands for Querying Statistical Data ........................................................................56
9.1.5 ’Online’ Commands for Parameter Set Operations ......................................................................57
9.1.6 ’Online’ Commands for BCL 80 with Oscillating Mirror.................................................................58
9.2 Setup Program...................................................................................................................60
9.2.1 Overview of the Parameter Structure...........................................................................................60
9.2.2 Setting the Decoding Parameters ................................................................................................63
9.2.3 Setting the Output Format Parameters ........................................................................................65
9.2.4 Setting the Host Interface Parameters .........................................................................................69
9.2.5 Setting the Parameters of the Digital IN/OUT..............................................................................71
9.2.6 Setting the General Parameters...................................................................................................73
9.2.7 Additional Functions: Setting the Reference Code Parameters...................................................74
9.2.8 Additional Functions: Setting the ’autoControl’ Parameters .........................................................75
10 Maintenance ..................................................................................................................... 76
10.1 General Maintenance Information......................................................................................76
10.2 Repair, Service ..................................................................................................................76
11 Appendix...........................................................................................................................77
11.1 ASCII Table........................................................................................................................77
11.2 Example Bar Code Lable Types ........................................................................................80
11.2.1 Module 0.5 ...................................................................................................................................80
11.2.2 Module 1.0 ...................................................................................................................................82
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Leuzeelectronic General Information
Leuze electronic Technical Description BCL 80 3
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1 General Information
1.1 Explanation of Symbols
The symbols used in this operating manual are explained below.
1.2 Definition of Terms
Activation
Initiates a read process, e.g. by triggering the switched input.
ASCII
Standard character set (American Standard Code for Information Interchange) with 128 characters.
Each character of the ASCII character set has been assigned a number from 0 to 127. This number
is usually displayed in decimal format, but can also be displayed in hexadecimal or octal.
Output format
Determines the data format of the bar code information output from the decoder.
autoConfig
The function integrated into the barcode reader which automatically recognises the typeand number
of characters ofthe code to be read in.
autoControl
The function integrated into the bar code reader used to monitor the read quality.
Bar code
An arrangementof parallel bars and spaces which are arranged according to a standardised protocol
such that they have a certain numeric or alphanumeric meaning.
CRT
The code reconstruction technology permits the reconstruction of the correct code from multiple frag-
ments. This feature can be ratheruseful if, for some reason, the barcode reader is unable to read the
entire label in one pass and needs to piece the code together from several "fragments."
Deactivation
End a read process, e.g. by using an online command.
Attention
Pay attention to passages marked with thissymbol. Failure toheed thisinformation canlead
to injuries to personnel or damage to the equipment.
Attention Laser Radiation!
This symbol warns of possible danger through hazardous laser radiation.
Note!
This symbol indicates text which contains important information.
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General Information Leuzeelectronic
4 Technical Description BCL 80 Leuze electronic
Decoder/Decoding system
The microprocessor control unit which translates the scanned bar code information into a simple sig-
nal that can be processed further.
Hex.
Abbreviation for hexadecimal notation.
Host
External computer orprogrammable logic controller (PLC) which is connected to the bar code reader
via a serial interface and is used to further process the decoded bar code information.
Label
Barcode label
Read quality
The read quality can be monitored using the autoControl function. The relationship of the number of
successful reads to the total numberof reads is determined and monitored.
multiNet
The network developed by Leuze for networking together several bar code readers.
No Read
Read failure; a read process was initiated but a label could notbe decoded.
Online command
A command which is sentdirectly to the bar code reader from the host or a computer connected to the
interface.
Parameter set
Thedata setwhich is permanentlystoredin thebar codereader and contains all ofthe devicesettings.
PD
Programming device
Postfix
Trailer of the data transfer protocol (frame protocol) between the bar code reader and the host.
Prefix
Header of the data transfer protocol (frame protocol) between the bar code reader and the host.
Protocol
Interface protocol of the serial interface.
Frame protocol
Transfer protocol for the data transfer between the bar code reader and the host.
Reference code
Bar code, to be compared with scanned labels.
Scanner
Bar code reader that optically scans the bar code with a laser beam.
Switched output
Connection for output of status or event messages, e.g. after a failed read.
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Leuzeelectronic General Information
Leuze electronic Technical Description BCL 80 5
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Switched input
Bipolar input for connecting a sensor or switch used for initiatinga readprocess or for acquiring aref-
erence code.
Interface module
Electronic component in the connector unit MA 10 which carries out the electrical adjustment of the
various serial interface types (e.g. RS 232, RS 422, etc.).
PLC
Programmable logic controller. A PLC usually can be used as a host.
Bar code
An arrangementof parallel bars and spaces which are arranged according to a standardised protocol
such that they have a certain numeric or alphanumeric meaning.
Teach-In
Programming a reference code using an example bar code.
1.3 Declaration of Conformity
The bar code reader BCL 80 and the connector unit MA 10 have been developed and produced in
accordance with the applicable European standards and directives.
The manufacturer of the product, Leuze electronic GmbH + Co. in D-73277 Owen/Teck, possesses a
certified quality assurance system in accordance with ISO 9001.
Note!
The corresponding declaration of conformity can be requested from the manufacturer.
ISO
9001
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Safety Notices Leuzeelectronic
6 Technical Description BCL 80 Leuze electronic
2 Safety Notices
2.1 Safety Standard
The bar codereader BCL 80 and the connector unit MA 10 have been developed, produced and test-
ed subject to the applicable safety standards. They correspond to the state of the art.
2.2 Intended Use
Bar code readers of the type BCL 80 are conceived as stationary, high-speed scanners with integrat-
ed decoders for all current bar codes used for automatic object recognition.
The connector and interface unit MA 10 simplifies the connection of the bar code reader of type
BCL 80 / BCL 40 and adapts to various host interfaces. Connection to other bar code readers is not
authorised.
In particular, unauthorised use includes:
• rooms with explosive atmospheres
• operation for medical purposes
Fields of application
The bar code reader BCL 80 with optional connector unit MA 10 is conceived particularly for the fol-
lowing fields of application:
• for package distribution and sorting installations
• for pallet transportation applications
• storage and conveying engineering, in particular for object identification on fast-moving conveyor
belts
• pharmaceutical industry
• for all applications where great depth of focus and reading distances are required
2.3 Working Safety
• Never look at the laser beam directly (same as sunlight).
• Do not point the laser beam of the device to other persons.
• When mounting and adjusting the BCL, heed the reflection of the laser beam on reflective sur-
faces.
• Do not open the housing.
Opening it does not interrupt the activation of the laser diode through read clocking.
• Heed the laser safety regulations according to DIN EN 60825-1 (most current version).
Attention!
The protection of personnel and the device cannot be guaranteed if the device is operated
in a manner not corresponding to its intended use.
Attention Laser Radiation!
The BCL 80 is a laserdevice of laser class 2. Do not look directly into the laser beam.
Observe the legal and local regulations applicable to the operation of laser units.
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Leuzeelectronic Safety Notices
Leuze electronic Technical Description BCL 80 7
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2.4 Organisational Measures
Documentation
All entriesin this operatingmanualmust beheeded,inparticular thoseinthe sections "SafetyNotices"
and "Commissioning".
Carefully store this operating manual where it is accessible at all times.
Safety regulations
Observe the locally applicable legal regulations and the rules of the employers’ liability insurance as-
sociation.
Qualified personnel
Mounting, commissioningand maintenanceof the device may only becarried out by qualified person-
nel.
Electrical work must be carried out by a certified electrician.
Repair
Repairs must only be carried out by the manufacturer or an authorised representative.
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Description Leuzeelectronic
8 Technical Description BCL 80 Leuze electronic
3 Description
3.1 The Bar Code Readers BCL 80
The bar code reader BCL 80 is a high-speed scanner with integrated decoder for all bar codes cur-
rently in use, e.g. 2/5 Interleaved, EAN, etc.
The many possible configurations of the device allow its adaptation to a multitude of reading tasks.
Due to the large reading distance combined with the great depth of focus, the device is ideally suited
for package and pallet transportation systems.
Togetherwith the connector unit MA 10, it can easily be adapted for use with various interfaces, thus
allowing additional processing by other systems. The MA 10 connector unit can also be used to net-
work together several BCL 80 devices and to simplify electrical installation.
3.2 Features of the BCL 80
Performance features
• Maximum depth of focus
• Scanning rate: 600 Scans/s; application-specific adjustable
• Maximum reading distance of 2300 mm
• A switched input for triggering a read process using sensors
• Automatic monitoring of the read quality with the 'autoControl' function
• Automatic recognition of the bar code type using 'autoConfig'
• All device parameters can be set by software
• Heavy-duty housing of protection class IP 65 with corresponding cable
• RS 232 or RS 485 interface to host
• Extensive formatting possibilities for data output
• Reference code (comparison code)
• A version of the BCL 80 with an oscillating mirror add-on is available
Added features with MA 10
• Device status display with 4 LEDs
• RS 485 interface with electrical isolation for networking several devices
• Alternative interface RS 232, RS 422 or TTY using a selectable interface module with electrical
isolation for directly connecting to the host
• Switched output for status messages (second output on request)
• Additional switched input for the definition of reference code 1
• Simple electrical connection via double terminal clamps, i.e. both the power supply and the inter-
face circuits can easily be connected in series.
• Heavy-duty housing of protection class IP 65
• 2 parameter sets can be stored locally in the MA 10
(current parameter set, customer-specific parameter set)
• Built-in RS 232 service interface for fast commissioning or troubleshooting on site using a PC or
programming device
• Switch for the autoConfig function
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Leuzeelectronic Description
Leuze electronic Technical Description BCL 80 9
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Modular Concept
BCL 80 ’stand alone’
The bar code readerBCL 80 canbe operatedas anindividual ’standalone’(  ) device. Electrical con-
nection of the power supply, interface andswitched inputare centrally madevia a15pinSubDsocket.
For connection, itis best to use the 15 conductor connection cable from Leuze.The requirements for
protection class IP 65 are fulfilled when using this cable only (see Chapter 5)!
BCL 80 with MA 10
When using several BCL 80 units or under rough environmentconditions, the installation of one con-
nector unit MA 10 for each BCL 80 unit is recommended.
Electrical connection, commissioning, and service can be comfortably carried out in a short period of
time.
The BCL 80 and MA 10 can be mounted directly together ( ó ) or arranged separately next to each
other. When mounted separately ( ì ), the two units are connected by a cable. Protection class IP 65
is maintained when the sealed accessory cable is used (see Chapter 5).
Figure 3.1: Possible combinations of the BCL 80 / MA 10

BCL 80 as
’Stand alone’-device
ó
BCL 80 with the
connector unit
MA 10 mounted together
ì
BCL 80 and MA 10
mounted separately and
connected together by a
cable
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Description Leuzeelectronic
10 Technical Description BCL 80 Leuze electronic
Networking
Up to 31 BCL 80 bar code readers can be networked together using the connector unit MA 10 (with
interface module RS 485). The devices are interconnected by connecting the individual RS 485 inter-
faces in parallel.
multiNet plus
In the Leuze multiNet plus, the individual network devices sequentially transfer their data to the net-
work master MA 30 when requested (’polling’). The master station can also be fitted with an BCL 80,
making it a complete scanner station which also controls the network.
Each network device declared as a slave maintains a device address which is set in the respective
MA 10 with acoding switch.If the reader unit is exchanged (BCL), the device address and all settings
in the MA 10 are maintained.
Themasterthentransmitsthe dataof allnetwork devicesviaitshost interface toa primaryPLC control
system or a computer, i.e. it ’collects’ the scanner data in the network and transmits them to one in-
terface on the hostcomputer.Thisreduces interface costs (CP’s) andtimeprogrammingthe software.
Suitable network master devices are: DD 55, MDS 70 and MA 30.
Figure 3.2: Networking possibilities using the multiNet plus
RS 485
optional
• RS 485,
• RS 232,
•RS422
or
•TTY
Network-Master
multiNet plus
MA 30
- Backup
- Parameter
Voltage
supply
Sensor
Sensor
Sensor
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Leuzeelectronic Description
Leuze electronic Technical Description BCL 80 11
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Two-wire RS 485
The LeuzeMultiNet plus is optimisedfor fast transmission of scanner data to a primary host computer.
The multiNet plus physically consists of a two-wire RS 485 interface through which the multiNet plus
software protocolis controlled. This makes wiring the network easy and inexpensive since slaves are
connected to each another in parallel.
Interface modules
Shielded, twisted pair conductors should be used for the multiNet. This allows a total network length
of up to 1200 m. Connection of the network to the primary computer is made via the hostinterface of
the MA 30 which can be equipped with 4 different physical interface modules. Modules for RS 232,
RS 422, TTY and RS 485 are available.
3.3 Construction
Device construction BCL 80
Figure 3.3: Bar code reader BCL 80
’Ready’ LED ontherear of
the device 4 fastening threads M4 on the rear of the device
Dovetail fastening
groove
Reading window 15 pin SubD connector
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Description Leuzeelectronic
12 Technical Description BCL 80 Leuze electronic
Device construction MA 10
Fig. 3.4: connector unit MA 10
Device variations MA 10
The MA 10 is available in four models:
•MA 10 100 with host interface module RS 485
•MA 10 110 with host interface module RS 232
•MA 10 120 with host interface module TTY
•MA 10 130 with host interface module RS 422
All modules are galvanically isolated, i.e. they are EMC interference protected and immune to differ-
ences in voltage potentials across long cable lengths.
Note!
Only the type MA 10 100 can be used as a multiNet slave unit.
Mounting holes for the
BCL 80 with M4 screws 4 Status-LEDs on the rear
Screw gland PG11 for the
power supply cable
Screw glands PG9 for the
switched input and the inter-
face cables
4 fastening threadsM4onthe
base of the device
Dovetail fastening
grooves
15-pin SubD
connector
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Leuzeelectronic Technical Data
Leuze electronic Technical Description BCL 80 13
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4 Technical Data
4.1 General Technical Data
Technical Data BCL 80
Manufacturer: Leuze electronic GmbH + Co.,In derBraike 1, D-73277 Owen / Teck
Type: BCL 80, bar code reader with integrated decoder MA 10, connector /
interface unit for BCL 80
General Specifications
Housing Diecast aluminium
Dimensions 100 x 155 x 90 mm (H x W x D)
Weight approx. 1.63 kg
approx. 2.7 kg (version with oscillating mirror)
Protection class IP 65
Scanner
Resolution 0.2 … 1 mm
Reading distance 300 … 2300 mm
300 … 1800 mm (version with oscillating mirror)
Scanning rate 600 Scans/s (adjustable)
Laser source laser diode, red 660 nm, 1 mW, protection class 2
Beam deflection by means of rotating polygon mirror wheel
Optical window glass with scratch-resistant Indium coating
Mirror oscillating frequency 0.2 … 5.0 Hz (adjustable)
Decoder
Code types 2/5 Interleaved
Code 39
UPC (A, E)
EAN
Code 128 / EAN 128
Pharmacode
Add-On (EAN)
CODABAR
Code reconstruction all versions of the BCL 80 are available with optional code reconstruc-
tion technology
Interfaces
Type can be switched between RS 232 and RS 485,
additional service interface (RS 232)
Baud rate 110 … 57600 Baud selectable (host only)
Switching input 12 … 36 V DC / AC voltage, selectable galvanic isolation or supplied
operating voltage, max. insulation voltage: 250 V (with galvanic isola-
tion)
Power supply
Operating voltage 18 … 36 V DC
Power consumption 6 VA max.
18 VA max. (version with oscillating mirror)
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Technical Data Leuzeelectronic
14 Technical Description BCL 80 Leuze electronic
Technical Data MA 10
Environmental conditions
Operating temperature range 0 … + 40°C
Storage temperature range - 20 … + 60°C
Air humidity max. 90% rel. humidity, non-condensing
Vibration accord.to IEC 68.2.6
Shock accord. to IEC 68.2.27
EMC accord.to IEC 801
General Specifications
Housing Diecast aluminium
Dimensions 130 x 90 x 78 mm (H x W x D)
Weight approx. 0.74 kg
Protection class IP 65
Interfaces
Type (optional) RS 232, with galvanic isolation
RS 422, with galvanic isolation
RS 485, with galvanic isolation
TTY, with galvanic isolation
Service interface RS 232 internal, 9 pin Sub D plug, male
Inputs/outputs
2 switched inputs galvanically isolated,
with supply voltage terminal for sensors
12 … 36 V DC/AC, insulation voltage 500 V
2 switched outputs can be operated galvanically isolated or not isolated
switching voltage 5 … 48 V DC, max. load 500 mA
Power supply
Operating voltage 18 … 36 V DC
Power consumption 2 VA max.
Environmental conditions
Operating temperature range 0 … +50°C
Storage temperature range -20 … +60°C
Air humidity max. 90% rel. humidity, non-condensing
Vibration accord. to IEC 68.2.6
Shock accord. to IEC 68.2.27
EMC accord.to IEC 801
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Leuzeelectronic Technical Data
Leuze electronic Technical Description BCL 80 15
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4.2 Dimensioned drawings
Figure 4.1: Dimensioned drawing BCL 80
Figure 4.2: Dimensioned drawing of BCL 80 with oscillating mirror add-on
Figure 4.3: Dimensioned drawing MA 10
5.8149.2
5.8 94.2
M4 - 10 deep (4 x)
15.6
23.8
160
171.5
170
100
90
130
10
22.5
78
70
90
116
M 4 (4x)
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Technical Data Leuzeelectronic
16 Technical Description BCL 80 Leuze electronic
4.3 Optical Data
The range in which the bar code can be read by the BCL 80 (the so-called reading field) depends on
the quality of the printed bar code and its dimensions.
Therefore, above all, the module of a bar code is decisive for the size of the reading field.
Figure 4.4: The most important characteristics of a bar code
The BCL 80 is available in various models for various reading tasks. A distinction is made between
line scanners and line scanners with an oscillating mirror add-on. The latter may be used as de-facto
raster scanners. For both varieties, there is also a version featuring code reconstruction technology
(CRT). The device specifications are given in the following table and accompanying figure.
Note!
A ruleof thumb: The smaller themodule of the bar code is, the smaller the maximumreading
distance and reading field width will be.
Therefore, when selecting a mounting location and/or the bar code label, take into account
the different reading characteristics of the scanner with various bar code modules.
M = Module: The narrowest line or spaceof a bar code
in mm
ZB= Wide elements: Wide lines and spaces are a multiple
(ratio) of the module
Module x Ratio = ZB(Normal Ratio 1 :2.5)
BZ= Quiet zone: The quiet zone should beat least
10 times the module, but not less than 2.5 mm.
L = Code length: The length of thebar code in mm
including the start and stop characters. The quiet
zone is included depending on the code definition.
SL= Element length: Height ofthe elements in mm
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Leuzeelectronic Technical Data
Leuze electronic Technical Description BCL 80 17
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4.3.1 Type overview
4.3.2 Sweep principle
Line scanner (single line)
1 line scans the label.
Areas of use:
• when the bar code is printed in the conveying direction ('ladderarrangement')
• with bar codes having very short bar lengths
• when the scanning distance is large
Figure 4.5: Sweep principle for the line scanner
Type Maximum
range (mm) Module/ resolution
(mm)
Sweep
principle S*,
OM** or R1***
Scanning
rate (scan/s) Part No.
BCL 80 S N1 100 500 0.2 S 600 500 31668
BCL 80 S N2 100 900 0.3 S 600 500 31669
BCL 80 S M 100 1600 0.5 S 600 500 26181
BCL 80 S L 100 2300 0.7 S 480 500 31607
BCL 80 O1 N1 100 500 0.2 OM 600 500 36447
BCL 80 O1 N2 100 800 0.3 OM 600 500 36449
BCL 80 O1 M 100 1400 0.5 OM 600 500 36450
BCL 80 O1 L 100 1800 0.7 OM 480 500 36451
BCL 80 CRT M 100 1600 0.5 S 600 500 29025
BCL 80 CRT O1 M 100 1400 0.5 OM 600 500 36452
BCL 80 R1 M 100 1600 0.5 R1 600 500 29221
S*: Line Scanner Single Line (1 line)
OM**: Line Scanner with oscillating mirror add-on
R1***: Raster Scanner (8 lines)
material flow direction
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Technical Data Leuzeelectronic
18 Technical Description BCL 80 Leuze electronic
Line scanner with oscillating mirror add-on
1 line that is continuously deflected by a mirror during scanning scans the label at varying heights.
Areas of use:
• when the label's position is not fixed, e.g., on palettes
• when the bar code is printed in the conveying direction ('picket fence arrangement')
• when reading stationary objects
• when the scanning distance is large
• when a large reading field has to be covered
Figure 4.6: Sweep principle for the line scanner with oscillating mirror add-on
4.3.3 Reading Fields
The BCL 80 is available in two different versions (with / without oscillating mirror add-on) thatalso dif-
fer in range and resolution (see Chapter 4.3.1).
Version S (BCL 80 SN1 100 /BCL 80 SN2 100 / BCL 80 SM 100 / BCL 80 SL 100):
Standard version with / without CRT
Medium to very long range for barcodes with a medium module.
Version O (BCL 80 ON1 100 / BCL 80 ON2 100 / BCL 80 OM 100 / BCL 80 OL 100):
Version with oscillating mirror add-on and with / without CRT
Medium to very long range for barcodes with a medium module.
The following graphic displays the scanning curves of the various BCL models.
Note!
Please note that the actual scanning curves can vary due to factors such as label material,
print quality, reading angle, print contrast, etc.
material flow direction
oscillating
movement
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