Leuze electronic BCL 90 Parts list manual

Leuzeelectronic
Barcode scanner BCL 90
Technical Description
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All rights reserved,especially theright ofreproduction, distributionand translation. This document may not be duplicated orreproduced
in any form (print, photocopy, microfilm or data recording) without the written permission of Leuze electronic GmbH + Co.
It is subject to changes due to technical progress
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Leuze electronic Technical Description BCL 90 3
Leuzeelectronic Table of contents
1 General Information...........................................................................................................6
1.1 Explanation of Symbols .......................................................................................................6
1.2 Important Terms...................................................................................................................6
1.3 Declaration of Conformity ..................................................................................................12
2 Safety Notices ..................................................................................................................13
2.1 Safety Standards ...............................................................................................................13
2.2 Intended Use......................................................................................................................13
2.3 Working Safely...................................................................................................................13
2.4 Organisational Measures...................................................................................................15
3 Device Description...........................................................................................................17
3.1 The Function of the Device................................................................................................17
3.1.1 Autofocus Function......................................................................................................................18
3.1.2 Event-driven Focus Position Switching........................................................................................19
3.1.3 Variants of the Scanning Process................................................................................................20
3.1.4 Other Components ......................................................................................................................20
3.1.5 Networking...................................................................................................................................22
3.2 Device Structure ................................................................................................................24
3.2.1 Scope of Delivery.........................................................................................................................24
3.2.2 Device Models.............................................................................................................................24
3.2.3 System Requirements .................................................................................................................25
3.2.4 View of the Device.......................................................................................................................26
4 Technical Data..................................................................................................................27
4.1 Technical Data...................................................................................................................27
4.1.1 Data Sheet BCL 90 CAT M 100 / BCL 90 CAT N 100 / BCL 90 CAT F 100 ...............................27
4.1.2 Data Sheet BCL 90 CAT OM 100, BCL 90 CAT ON 100, BCL 90 CAT OF 100.........................29
4.1.3 Data Sheet BCL 90 CAT M 100H, BCL 90 CAT N 100H, BCL 90 CAT F 100H..........................29
4.1.4 Data Sheet BCL 90 CAT OM 100H, BCL 90 CAT ON 100H, BCL 90 CAT OF 100H.................30
4.2 Dimensioned Drawings......................................................................................................30
4.2.1 Line Scanner (Standard Device) with/without Heater..................................................................30
4.2.2 Line Scanner with Oscillating Mirror (with/ without Heater).........................................................31
4.3 Optical Data (Specification Diagrams)...............................................................................32
4.3.1 Reading Conditions for All Diagrams...........................................................................................32
4.3.2 Overview of Diagrams .................................................................................................................32
4.3.3 Medium Density: Reading Performance Data of Line Scanner ...................................................34
4.3.4 Medium Density: Reading Performance Data of Line Scanner with Oscillating Mirror................40
4.3.5 High Density: Reading Performance Data of Line Scanner.........................................................47
4.3.6 High-Density: Reading Performance Data of Line Scanner with Oscillating Mirror.....................52
4.3.7 Low Density: Reading Performance Data of Line Scanner ........................................................58
4.3.8 Low Density: Reading Performance Data of Line Scanner with Oscillating Mirror......................62
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4 Technical Description BCL 90 Leuze electronic
Table of contents Leuzeelectronic
5 Accessories (Order Codes).............................................................................................65
5.1 Device and Connection Accessories .................................................................................65
5.1.1 External Parameter Memory ........................................................................................................65
5.1.2 Cables, External Parameter Memories and Plug Covers.............................................................66
5.2 Mounting Accessories........................................................................................................67
5.2.1 Dimensions ..................................................................................................................................68
6 Mounting...........................................................................................................................69
6.1 Overview of the Mounting Steps........................................................................................69
6.2 Preparing the Mounting......................................................................................................69
6.2.1 Have Ready the Components to be Mounted..............................................................................69
6.2.2 Have Ready Accessories.............................................................................................................69
6.2.3 Lay Aside Auxiliary Materials .......................................................................................................69
6.2.4 Exchanging the Laser Warning Sign............................................................................................70
6.2.5 Selecting the Mounting Site .........................................................................................................70
6.2.6 Fastening Accessories.................................................................................................................70
6.2.7 Distance between BCL and Bar Code .........................................................................................72
6.2.8 Counting Direction of the Code Position CP and Code Angle CW...............................................74
6.3 Mounting and Adjusting the Device ...................................................................................75
6.3.1 Mounting the BCL ........................................................................................................................75
6.4 Mounting External Components.........................................................................................75
6.4.1 Mounting Modular Connector Unit MA 90....................................................................................75
6.4.2 Mounting the External Reading Cycle Sensor..............................................................................76
6.4.3 Mounting Sensors for Object Distance Detection.........................................................................76
7 Electrical Connection......................................................................................................78
7.1 Overview of the Installation Steps......................................................................................78
7.2 Electrical Connections and Cables....................................................................................78
7.2.1 Core Cross-Sections....................................................................................................................78
7.2.2 Pre-assembled Cables (Overview)...............................................................................................79
7.2.3 Connections/Cables for the Modular Connector Unit MA 90........................................................80
7.3 Pin Assignment of the Connections...................................................................................81
7.3.1 Connections of the BCL ...............................................................................................................81
7.3.2 Ext. Parameter Memory KB090-3000P No. 500 35 322 (Optional)
Plug Cover KB090-3000H No. 500 35 324 (Optional)..................................................................82
7.4 Preparing the Electrical Installation....................................................................................83
7.4.1 Conditions for Using the Host Interface........................................................................................83
7.4.2 Supply Voltage.............................................................................................................................83
7.4.3 External Power Supply Unit/Wiring without Connector Unit.........................................................84
7.5 Electrical Installation..........................................................................................................88
7.5.1 Overview of the Connection Steps...............................................................................................88
7.5.2 Supplementary Devices ...............................................................................................................88
7.5.3 Connect supply voltage................................................................................................................88
7.5.4 Connect the BCL 90 host interface ..............................................................................................89
7.5.5 Connect the PC............................................................................................................................90
7.5.6 Connect the Switched Inputs .......................................................................................................90
7.5.7 Connect Switched Outputs "SWO 1 … SWO 4" ..........................................................................94
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Leuze electronic Technical Description BCL 90 5
Leuzeelectronic Table of contents
8 Operation..........................................................................................................................96
8.1 Overview of the Commissioning Steps ..............................................................................96
8.2 Base Setting.......................................................................................................................96
8.2.1 Base Setting of the Line Scanner BCL 90 (All Models) ...............................................................96
8.2.2 Base Setting of the Line Scanner BCL 90 with Oscillating Mirror (All Models)............................97
8.3 Display and Operating Elements .......................................................................................98
8.3.1 Operating Elements.....................................................................................................................98
8.3.2 Function of the LED Indicators ....................................................................................................98
8.4 Quick Start .......................................................................................................................102
8.4.1 Commission the BCL on Factory Default Setting ......................................................................102
8.5 Configuration (Parameterization).....................................................................................103
8.5.1 Configure the BCL with User Interface of BCL-Config...............................................................103
8.6 Oscillating-Mirror Functions .............................................................................................104
8.7 Operating Modes and Output of the Read Result............................................................106
8.7.1 Read Operation (Standard Operating Mode).............................................................................107
8.7.2 Percentage Evaluation...............................................................................................................108
8.7.3 Calibrating help..........................................................................................................................109
8.7.4 Background Teach-in.................................................................................................................109
8.7.5 Self Test.....................................................................................................................................109
9 Configuration .................................................................................................................110
9.1 Calculating of Parameter Values for Setting the BCL......................................................110
9.1.1 Calculating the Number of Scans (for Standard Decoder) ........................................................110
9.1.2 Calculating the Starting Position and Deflection Speed for the Forward
and Return Phase of the One-Shot ...........................................................................................113
9.1.3 Calculating Required Distances between Bar Codes for Reading Several Bar Codes
per Object..................................................................................................................................114
9.2 Overview of Commands and Parameters........................................................................115
9.2.1 General ’Online’ Commands......................................................................................................115
9.2.2 ’Online’ Command for System Control.......................................................................................116
9.3 Installation of the "BCL-Config" software.........................................................................117
10 Maintenance ...................................................................................................................118
10.1 Servicing during Operation ..............................................................................................118
10.2 Maintenance ....................................................................................................................119
10.3 Repairs, Servicing............................................................................................................119
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General Information Leuzeelectronic
6 Technical description BCL 90 Leuze electronic
1 General Information
1.1 Explanation of Symbols
The symbols used in this operating manual are explained below.
1.2 Important Terms
Attention!
This symbol appears before text passages that have to be observed by all means. Failure
to heed this information may lead to injuries to personnel or damage to the equipment.
Attention laser radiation!
This symbol warns of possible danger due to laser radiation detrimental to health.
Notice!
This symbol indicates text passages containing important information.
Aspect ratio
The ratio of code height (bar length) to code length (number of characters). The CRT decoder is de-
signed to read even bar codes with extremely small code heights
Autofocus function
The capability of the BCL to detect by itself the distance of the objects in the read process without us-
ing external sensors and automatically adapt the focus position to the reading level of the bar code.
BCL-Config
PC program, running under Windows®9x/ME or WindowsNT®/2000. Used for off-line parameteriza-
tion (adaptation to the onsite read condition) and online menu-driven operation of the BCL. The
pa-
rameter set
to be processed is exchanged with the BCL through upload and download .
Capture range
A zone set up by the BCL through increment management and comparison of the code position
around a moving bar code. This makes it possible, among other purposes, to separate bar codes with
identical contents and of the same code types.
Code angle (CW value)
Current deflection width of the scan line (oscillating mirror) across the scan direction when detecting
a bar code. The code angle is determined by the BCL for each scan. It is used to define a capture
range, for example, to separate bar codes with identical data contents and of the same code types
from each other within one area.
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Leuzeelectronic General Information
Leuze electronic Technical description BCL 90 7
TNT 35/7-24V
Code geometry
Bar code length and height.
Code position (CP value)
The position of the first dark bar of a detected bar code along the
scan line . It is identified by the BCL
in each scan and, for example, used to separate bar codes with identical data contents. For
decoding ,
the active evaluation range within the scan line can be defined specifically for an application by pre-
setting the minimum and maximum CP values.
Configuration file
File in the PC program BCL-Config in which a complete
parameter set of the BCL is stored for
archiving. The file can be printed in tabular form.
CRT decoder
Purpose-designed
decoder for reading bar codes with extremely small code heights as well as low-
quality or smudged print.
Data output string
Structured data telegram of the
read result that the BCL outputs in the host interface . The structure is
flexible and adaptable within a wide range to the requirements of the further processing of data. In con-
trast, the data output format of the
service interface is unchangeable.
Decoder, decoding
Code type-dependent evaluation routine for the reconstruction of the read bar code in electronic form
so that its data content can be decoded.
Deflection angle
Angle which the
scan line covers at both sides each of the centre position CW=50 (equivalent to 0°)
when deflected by the oscillating mirror. Also called oscillation angle.
Deflection width
Deflection of the scan line by way of the
oscillating mirror across the scanning direction to both sides
of the centre position CW=50 (equivalent to light exit under 105°). Also called oscillation amplitude.
While the deflection width is set at maximum in the "oscillation at predefined amplitude" mode, in the
"oscillation at variable amplitude" mode, it is adjusted for each distance configuration through the "Os-
cillating Mirror" Tab in the user interface of BCL-Config.
Distance configuration
Data set in the BCL to establish a
focus position of the laser beam for event-driven focus position
switching
. The focus position as well as the minimum and maximum code positions are to be entered
in the "Read Configuration" Tab of the user interface in BCL-Config. For the line scanner with oscillat-
ing mirror, the
oscillation amplitude (deflection width) also have to be entered. The depths of field for
the individual focus positions can be obtained from the specification diagram in relation to the resolu-
tion.
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General Information Leuzeelectronic
8 Technical description BCL 90 Leuze electronic
Distance detection
Device detecting in graduation distances from objects carrying the bar codes. One example is the
downward reading of a series of photoelectric sensors arranged in a vertical row beside a transporta-
tion line. The ranges for
focus position switching are defined through combinations of the switched in-
puts SE 2 to SE 6 and the cross-reference list for
distance configurations . Only required when the
autofocus function is not applied.
Distance profile
When using the
autofocus function with substraction of background difference, the background with-
out object is to be taught in the BCL before a read can take place. In a special measurement mode,
the BCL generates a profile ofthe distance variation in its field of view along the scan line. This profile
enables the BCL to detect objects in the reading field and adjust the required focus position on the
plane of the bar code on the object.
Download
The process of transmitting the
parameter set that was modified off-line in the user interface of BCL-
Config
from the PC to the BCL. BCL-Config always transmits a copy to the operating memory (RAM)
of the BCL.
External parameter memory
Optional accessory integrated in a plug cover. This design renders an easy exchange of device pos-
sible by locating the parameter set of the BCL as copy in an external memory (EEPROM). The re-
placement device accesses the memory directly and does not need to be configured manually.
Focus position switching
The capability of the BCL to shift the focus of the laser beam within a wide range on the read level.
Focus position switching is event-driven (e.g. through distance detection) or occurs dynamically in the
autofocus function .
Focus position
Distance of the focal point of the emitted laser beam from the reading window. Adjustable via the op-
tical system in the BCL. Defines a distance-dependent depth of field range (DOF) in which the bar
code can be detected.
Function interfaces
Switched inputs and outputs of the BCL.
Good Read
In the concluded
reading cycle , the BCL either detected the bar code or the required number of bar
codes given by the evaluation conditions set in the parameters.
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Leuzeelectronic General Information
Leuze electronic Technical description BCL 90 9
TNT 35/7-24V
Header
Data block in the read result of the
host interface . It serves as header in the data output string for sub-
sequent data contents of the bar codes. It contains, depending on configuration, read diagnosis data
and/or constants (e.g. alphabets). In its basic setting, it is empty.
Host interface
Main data interface of the BCL with configurable data output format. The host interface serves, among
others, to output the
read result in telegram form to the host/PLC. It is used to integrate the BCL in the
Leuze network or build up a stand-alone system. It offers various transmission protocols.
Increment management
In the BCL for certain applications, it serves to unambiguously distinguish between bar codes which
have identical contents and move during the read process.
Leuze multiNet plus
Special, powerful combination of a maximum of 32 BCLs with high data transmission rates via the RS
485 interface. Co-ordination (polling) and connection of the BCLs to the host by means of the network
master MA 31.
Line scanner with oscillating mirror
Line scanner that additionally deflects its laser beam across the scanning direction to the two sides of
a centre position by means of an oscillating mirror. In this way, the BCL can also search larger areas
and spaces for bar codes. For the search, optimizable functional sequences of the oscillating mirror
are also possible (variable deflection for each distance configuration, One-shot) beside the simple de-
flection at maximum oscillation amplitude.
Line scanner
Scanner deflecting its focussed laser beam by way of a polygon mirror wheel with parallel-axis mirrors
at an extremely high speed. In this way, it generates a light dot on the read level running back and
forth on a line, and due to its relative inertia, appearing to the human eye as a "static" scan line.
Multiple reading
Selectable number of reads that has to supply identical internal read results (data contents) from ex-
actly the same bar code before the BCL outputs the read result.
No Read format
Special, parameterizable data block replacing every expected and not detected bar code in the data
output string of the host interface for a
No Read . The format consists of a selectable combination of
the error string and
separator .
No Read
In the concluded
reading cycle , the BCL neither detected any bar code nor the required number of bar
codes given by the evaluation conditions set in the parameters.
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General Information Leuzeelectronic
10 Technical description BCL 90 Leuze electronic
Object height detection
See distance detection.
One-shot
A directed, single deflection of the oscillating mirror for each
reading cycle . It primarily consists of a
slow forward phase (read) and rapid return phase (return to the starting position).
Opening angle
a
The angle within the limits of which the laser beam is deflected by the polygon mirror wheel. Before
the reading window, a V-shaped area is formed radially in the scanning direction in which the bar code
to be read must be. If only a part of the opening angle is used (part of the scan line is positioned sym-
metrically around the middle), there will be a larger depth of field range for the same focus position
and resolution.
Oscillating mirror reversal point
Point of deflection the oscillating mirror is at in which a reversal of direction takes place. This point can
be used to trigger the
focus position switching for low-speed applications (search function).
Parameter set
Data set with which the implemented functions are initialised and activated in the BCL. Itis transferred
through upload or download from the BCL to BCL-Config or vice versa.
Pine tree effect
This effect of the
line scanner with oscillating mirror is a result of the limits set by the active scan line
range (CP value) and the oscillation amplitude (CW value). Hence a "sharp window" of the same size
can be generated in the reading field for every distance configuration for any read distance.
Read diagnosis data
Data that the BCL derives directly from the read process. With these data, it is possible to assess,
among others, the quality of the reading. They are output via the
terminal interface , always together
with the read result.
Read range (DOF)
Depth of field range at both sides of the focal point of the laser beam. The size of the range depends
on resolution and read distance.
Read result
Electronic representation of the data contents of the read bar code together with the
read diagnosis
data
in a data output string after the reading cycle is completed. The read result of the terminal inter-
face has a predefined format for content and output, while the read result of the host interface can be
separately configured for Good Read and No Read and have symbols added to it.
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Leuzeelectronic General Information
Leuze electronic Technical description BCL 90 11
TNT 35/7-24V
Reading cycle
Cycle applied externally to the BCL to trigger the internal
scan gate time , by way of, for example, a
retro-reflective photo electric sensor or as a result of a command from the host via the serial interface.
Reading field height
The length of the
scan line available for the detection of the bar code on the read level. The length
depends on the read distance due to the V principle.
Result status output
Function of the four switched outputs "SWO 1 … SWO 4" in read mode. The signals indicate the status
of the read results, but without displaying its content (e.g. Good Read). The display of the LED "Read
Result" is controlled by the output of "SWO 2".
Scan gate time
Time window in which the BCL activates the laser diode and attempts to detect valid bar codes from
the information read. Depending on the selected output mode of the read result, the scan gate time
may be shorter than the externally applied reading cycle.
Scan line
See line scanner.
Separator
Data block in the read result of the
host interface . It serves as separating unit between the data con-
tents of the bar codes. It can either precede or follow the bar codes. It contains, depending on config-
uration, read diagnosis data and/or constants (e.g. alphabets).
Service interface
Auxiliary interface (RS 232) of the BCL with predefined data output format. It is always possible to ac-
cess the BCL from the PC program BCL-Config via this interface.
Specification diagrams
Diagrams for determining the resolution-dependent depth of field range (DOF) with a predefined focus
position.
Standard decoder
Successfully tried and tested
decoder of the product series BCL. This device is recommended when
the bar codes have sufficient code heights, small tilt and good print for reading.
Switching sequence
Function for event-driven focus position switching. Sequence of the focus positions to be adjusted one
after the other with the corresponding depths of field. For this purpose, the numbering of the active
distance configurations is entered in the cross-reference list in the desired position.
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General Information Leuzeelectronic
12 Technical description BCL 90 Leuze electronic
1.3 Declaration of Conformity
The BCL 90 has been developed and manufactured in accordance with the applicable European
standards and directives.
The manufacturer of the products, Leuze electronic GmbH + Co. in D-73277 Owen/Teck, has a certi-
fied quality assurance system in accordance with ISO 9001.
Teach-in
The process in which the BCL, in the parameterization mode, is taught the "knowledge" for adapting
to the read condition. Example: Background teach-in for the autofocus function, called
distance profile .
Terminator
Data block in the read result of the
host interface . It serves to terminate the preceding data content of
the bar code. It contains, depending on configuration, read diagnosis data and/or constants (e.g. al-
phabets).
Time of transmission
Output time of the read result in relation to the beginning of the
reading cycle and of the internal scan
gate time
.
Upload
The process of transferring the
parameter set from the BCL to the PC in the user interface of BCL-
Config
. BCL-Config always loads a copy of the current parameter set from the RAM of the BCL. Rep-
resentation of the parameter values in the tabs. Prerequisite for modifying the current parameter set.
User interface
Windows-based input interface in the PC software BCL-Config for the operation and configuration of
the BCL.
Notice!
A respective declaration of conformity can be requested from the manufacturer.
ISO
9001
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Leuzeelectronic Safety Notices
Leuze electronic Technical description BCL 90 13
TNT 35/7-24V
2 Safety Notices
2.1 Safety Standards
The BCL 90 has been developed, manufactured and tested in accordance with the applicable safety
standards. It represents the state of the art.
2.2 Intended Use
The BCL is used for the automatic detection and decoding of bar codes. It is mounted in a read station
and reads, for example, bar codes on objects in a transportation line.
The BCL transmits the data content of the decoded bar code via its host interface to a host for further
processing.
Leuze electronic bears no responsibility or liability in the case of any other use and modifications of
the device, including those made for the purpose of mounting and electrical installation.
In particular, unauthorised uses include:
• rooms with explosive atmospheres
• operation for medical purposes
Areas of application
The BCL 90 is conceived particularly for the following areas of application:
• Paper-roll identification
• Automobile sector
• Storage and conveying technologies, in particular for object identification on fast-moving conveyor
belts
• Pallet transportation applications
• Omnidirectional reading
2.3 Working Safely
• 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 is not guaranteed if the device is operated in a
manner not corresponding to its intended use.
Attention, laser radiation!
Damage to the eyes through laser radiation!
The BCL operates with a red-light laser of Class 2. Staring at the laser beam may cause
damage to the retina.
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Safety Notices Leuzeelectronic
14 Technical description BCL 90 Leuze electronic
Laser power
The laser works with a wavelength
l = 650 nm (visible red light). The maximum output power of the
laser beam at the reading window is 2.8 mW.
The exiting radiation is not dangerous to the human skin.
Laser warning signs
The laser warning signs for Europe (Figure 2.1) are at the following locations on the BCL:
• On line scanners, the laser warning symbol is beside the reading window on the front side and the
laser warning sign in British/American English is on the same side as the electrical connections.
• On the line scanner with oscillating mirror, the laser warning symbol is above the reading window
on the oscillating mirror cover, and the laser warning sign in British/American English is on the
same side as the electrical connections.
Figure 2.1: Laser warning signs mounted on the BCL
Notice!
The scope of delivery also includes one set of laser warning signs with German/American
and French/American versions. If needed, these signs can be used topaste over the British/
American English sign.
If the BCL is installed in a machine/sheeting in such a way that the laser warning signs of
the device are covered, further warning signs (not in the delivery scope) have to be mounted
beside the exit aperture of the laser beam on the machine!
EN 60825-1: 1994 + A11 : 1996
Max. output radiation:
Pulse duration:
Emitted wavelength:
2,8
111
650
mW
µs
nm
2,8
56
650
mW
µs
nm
CLASS II LASER PRODUCT
Max. Output:
Pulse duration:
Wavelength:
Complies with 21 CFR 1040.10
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Leuzeelectronic Safety Notices
Leuze electronic Technical description BCL 90 15
TNT 35/7-24V
Internal protective circuits
The BCL has monitoring circuits which switch off the laser diode in case irregularities occur in beam
generation.
The activation/deactivation of the laser diode during the read process is controlled by read clocking
(clock).
10 min. after the start of a continuous reading cycle, a safety circuit (one-shot) automatically switches
off the laser diode during read operation under the clocking types "sensor input" and "serial interface",
but does not terminate the reading cycle. In this case, the BCL outputs a message via the service in-
terface:
"Laser safety time-out"
The reading cycle is to be terminated through aproper clock signal. The next reading cycle reactivates
the laser diode.
The laser diode is permanently switched on in the operating modes "percentage evaluation"
"calibrating help" and "show CP limits" as well as in the clocking type "free-oscillating" in
reading operation.
2.4 Organisational Measures
Documentation
All information in this technical description,especially the sections "Safety Notices" and "Commission-
ing" must by all means be observed.
Keep this technical description in a safe place. It should be accessible at all times.
Safety Regulations
Observe the locally applicable legal regulations and the rules of the employer’s liability insurance as-
sociation.
Qualified Personnel
Mounting, commissioning and maintenance of the device may only be carried out by qualified person-
nel.
Work on electrical installations may only be carried out by qualified electricians.
Repair
Repairs may only be carried out by the manufacturer or those authorised by the manufacturer.
Environmental Compatibility
The BCL is designed in such a way as to cause minimum harm to the environment. It contains no ma-
terials produced using silicone and therefore does not interfere with such processes as e.g. varnish
wetting in paint shops.
Attention!
Access and changes to the device, except where expressly described in this operating man-
ual, are not authorised.
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Safety Notices Leuzeelectronic
16 Technical description BCL 90 Leuze electronic
Energy Requirement
The energy requirement depends on the model:
• the line scanner typically consumes 9 W and a maximum of 16 W power
• the line scanner with oscillating mirror typically consumes 9 W and a maximum of 18 W power
• the line scanner with integrated heater typically consumes 75 W and a maximum of 90 W power
• the line scanner with oscillating mirror and integrated heater typically consumes 75 W and
a maximum of 100 W power
These values are based on operation with unconnected switched outputs.
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Leuzeelectronic Device Description
Leuze electronic Technical description BCL 90 17
TNT 35/7-24V
3 Device Description
3.1 The Function of the Device
The BCL detects bar codes using a scan line and decodes them. The BCL transmits the data via the
serial host interface to a host/PC for further processing. An overview of the functions of the BCL is
shown in Figure 3.1.
Figure 3.1: Block diagram: functions of the BCL
The BCL offers two decoders:
• the CRT decoder for decoding bar codes with small code heights, of bar codes with damaged or
dirty print and for reading extremely tilted bar codes (azimuth angle)
• the tried-and-tested standard decoder of the BCL series
The BCL derives from the read processes useful diagnosis data which can be transferred to the host,
and also contains operation data that can be called up. The read quality can be checked in the oper-
ating mode percentage evaluation.
The BCL needs a suitable trigger to start a read process as soon as an object is in the reading field.
The trigger causes a time window ("scan gate time") to open in the BCL for the read process. In the
basic setting, triggering takes place through an external reading cycle sensor. Alternatively, free-os-
cillating operation or a command via the host interface can also serve as triggers.
Four LED status displays provide optical information on the current operation status.
When triggered externally through a sensor, the switched input "SE 1" informs the BCL when it should
start reading. As an alternative to theautofocus function, focuspositions can be switched event-driven
through the five switched inputs "SE 2 … SE 6", and the inputs "SE 5" and "SE 6" can additionally be
assigned special functions. The four switched outputs "SWO 1 … SWO 4" can be assigned various
output functions of the event status and activate external devices, e.g. a PLC.
"SE 1"
"SE 2"
"SE 3"
"SE 4"
"SE 5"
"SE 6"
"SWO 1"
"Host"
"Service "
"SWO 2"
"SWO 3"
"SWO 4"
Scanner
Decoder
Interface
V
S
BCL 90
Terminal
Operation
Parameterization
etc.
HOST
Further processing of
the read result
Status display
e.g. Device Ready
e.g. Good read
e.g. No read
e.g. Match 1
Light barrier
Reading cycle
Signal*
Focus position
switching
Trigger one-shot
Path length increment
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Device Description Leuzeelectronic
18 Technical description BCL 90 Leuze electronic
The BCL is operated and configured on the user interface of the PC software BCL-Config through the
terminal interface (auxiliary interface) or using command strings through the host interface/service in-
terface.
System, warning and error messages provide assistance in set-up/troubleshooting during commis-
sioning and read operation.
3.1.1 Autofocus Function
With the autofocus function, the BCL is capable of detecting the distance of the object in the read proc-
ess without resorting to external sensors and can independently tune the focus position to the read
level of the bar code. To this end, the BCL measures the distance of the object in its field of view in
each read, generates an internal distance profile and positions the focal point on the object.
Three operating modes are available for different applications:
• Smallest distance: the BCL focusses on the smallest distance in the distance profile. In this case, it
neglects the background of its field of view. Applied e.g. for open views on the object, without sur-
rounding structures projecting into the read level.
• Difference to the background: the BCL is taught the distance profile of the background of its field of
view without object. Then, the BCL focusses during reading on the object it detects by subtracting
from the distance profile of the background. Applied e.g. for open views on the object with limits set
by structures projecting into the read level.
• Difference to the background with tracking: if there are several objects with different distances in
the reading field at the same time (distance conflict), the BCL focusses on the previous object
below its internal focus position switching. Applied in MSP operation (application with tracking
through the Tracking Portal Controller TPC 400).
The generated distance profile of the background can be displayed in BCL-Config. The field of view
is defined through the selection of the autofocus range, the opening angle and, in the line scanner with
oscillating mirror, additionally through limiting the oscillation amplitude(deflection angle). The parking
position (preferred position) of the focus position from which the BCL refocusses in each read can be
predefined. The same applies to a time or local lag (time-out or hysteresis). If required, an additional
offset can be applied to the focus position which can be adjusted through measurement. In this way,
the offset optimises for the object the depth of field which varies radially in the direction of the scan
line due to the V principle of beam deflection (Figure 3.2).
Figure 3.2: Optimisation of the DOF on the object
measured distance
optimised focus position:
measured distance plus offset for maximum
Depths of field (DOF)
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Leuzeelectronic Device Description
Leuze electronic Technical description BCL 90 19
TNT 35/7-24V
3.1.2 Event-driven Focus Position Switching
As an alternative to autofocus function, the BCL offers the possibility of an event-driven focus position
change, thereby covering a large DOF dynamically. For this purpose, a maximum of eight depths of
field can be defined as distance configurations and focussed on by the optical system in random se-
quence in read operation (Figure 3.3).
Figure 3.3: Focus position switching: dividing the DOF into distance configurations
A switch is made whenever the object distance changes (when reading downwards: object height de-
tection). A combination of signals from the switched inputs "SE 2 … SE 6", a command to the host
interface/service interface or the integrated timer (e.g. for the search function) serve to trigger the
switch. In the line scanner with oscillating mirror, the oscillating mirror reversal points of the bilateral
deflections also have a trigger function. The distance configurations are assigned to the switching se-
quence by a programmable cross-reference list. The distance measurement of the autofocus function
can also be used to assist in defining the distance configurations.
123 5 8
46 7 Focus position
Read distance
Read distance
Dc = Distance configuration
Focus position
Reading field height
Dc2
Dc1
Dc3 Dc4 Dc5 Dc6 Dc7 Dc8
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Device Description Leuzeelectronic
20 Technical description BCL 90 Leuze electronic
3.1.3 Variants of the Scanning Process
Line scanner (standard device)
It generates a scan line. The reading field height (the scan line length useful for evaluation) depends
on the read distance due to the V principle of beam deflection.
Line scanner with oscillating mirror
The oscillating mirror deflects the scan line additionally to both sides across the scan direction at a low
oscillation frequency. In this way, the BCL can also scan larger areas or spaces for bar codes. The
reading field height (the scan line length useful for evaluation) depends on the read distance due to
the V principle of beam deflection.
Aside from parking (fixed position) and the simple deflection at maximum oscillation amplitude, opti-
mised course of function of the oscillating mirror are also possible:
• oscillating at variable oscillation amplitude for each distance configuration
• one-shot: single, defined deflection for each reading cycle (forward and return phase)
3.1.4 Other Components
For information on technical data and features of the connector unit, refer to the data sheet MA 90.
BCL 90 "stand alone"
The bar code reader BCL 90 is operated as a "stand-alone" device. The BCL 90 provides two 15-pin
Sub-HD connectors for the supply voltage, the interface and the switched inputs.
BCL 90 with MA 90
The connector unit MA 90 offers simple electrical installation in conjunction with the BCL 90. We rec-
ommend the connector unit MA 90 for each BCL 90 if several BCL are to be networked. It is user-
friendly in terms of electrical connection, commissioning and maintenance requiring minimum time in-
put. BCL 90 and MA 90 are arranged separately. The two devices are connected by cable.
Heater
For low-temperature applications to a maximum of –35°C (e.g. in cold storage) an optional heater can
be permanently installed in the BCL. (See below)
External parameter memory
The external parameter memory is located in a plug cover beneath which are the two electrical con-
nectors of the BCL after mounting (IP 65). By having available a copy of the current parameter set of
the BCL, the parameter memory makes it easy and reduces the time needed to replace the BCL on
site. A manual configuration of the exchanged device is thereby omitted.
For application and operation see Section 5.1.1, on page 65.
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