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AB Quality Allen-Bradley 2755-SN3 User Manual

Adaptascan bar code readers
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Allen-Bradley
AdaptaScan
Bar Code
Readers
(Cat. No.
2755-SN3,-SN5, -SN8)
User
Manual

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Summary of Contents for AB Quality Allen-Bradley 2755-SN3

  • Page 1 Allen-Bradley User AdaptaScan Bar Code Manual Readers (Cat. No. 2755-SN3,-SN5, -SN8)
  • Page 2 Important User Information Solid state equipment has operational characteristics differing from those of electromechanical equipment. “Safety Guidelines for the Application, Installation and Maintenance of Solid State Controls” (Publication SGI-1.1) describes some important differences between solid state equipment and hard–wired electromechanical devices. Because of this difference, and also because of the wide variety of uses for solid state equipment, all persons responsible for applying this equipment must satisfy themselves that each intended application of this equipment is acceptable.

  • Page 3: Table Of Contents

    Table of Contents Using this Manual Preface Chapter Objectives ......... . P–1 Overview of this Manual .
  • Page 4 Table of Contents AdaptaScan Software (Catalog No. 2755-ASN) ..... . 1–14 Scanning Parameters ........1–15 Focus Options .
  • Page 5 Table of Contents Power Requirements ......... 3–12 Power Supplies .
  • Page 6 Table of Contents Specifications Appendix A Electrical ..........A–1 Mechanical .

  • Page 7: Using This Manual

    Preface Using this Manual Chapter Objectives Read this chapter to familiarize yourself with the rest of the manual. You will learn about: Contents of this manual Intended audience Terminology CE Directives Related publications Overview of this Manual The following table describes the contents of each chapter in this manual.

  • Page 8: Intended Audience

    P1–2 Using this Manual Intended Audience Because the AdaptaScan Software runs in the Microsoft Windows environment, you should know how to use a mouse, choose commands, and work with windows and dialogs. You should also have a basic understanding of PLC and SLC Controllers.

  • Page 9: Overview

    Chapter Overview Chapter Objectives This chapter briefly describes the AdaptaScan Bar Code Reader. Section Page Typical System 1–2 Reader 1–3 Typical Applications 1–5 Scanning Modes 1–8 Wiring Base 1–9 Communication Options 1–11 AdaptaScan Software 1–14 Safety Labels 1–17 Options and Accessories 1–18 Series B Changes If you are familiar with the Series A Reader and/or are replacing a...

  • Page 10: Typical System

    1–2 Overview Typical System A typical AdaptaScan installation consists of: Reader Wiring Base Package Detector Personal Computer (For Configuration and Setup) Configuration Cable Reader To Network or Control Device Wiring Base Package Detector The Reader is configured using the AdaptaScan Software (Catalog No.

  • Page 11: Reader

    Overview 1–3 Reader LED Indicators Configuration Scan Window Port Connector Dust Cap Wiring Base Connector The Reader scans and decodes bar code symbols. The integral decoder decodes the most common bar code symbologies. The scan and decode functions are configured using software on a personal computer.

  • Page 12: Led Indicators

    1–4 Overview LED Indicators Seven LEDs provide the following indications. Indicator Condition Indicates: Green Normal operating state Flashing Green Initialization and/or incorrect (unconfigured) configuration Processor fault (nonrecoverable) Module Module Flashing Red Minor fault (recoverable). Occurs when down- loading firmware. No power applied to Reader Green Normal DeviceNet operating state Flashing Green...

  • Page 13: Typical Applications

    Overview 1–5 Typical Applications The flexibility of the Reader allows you to configure it for a variety of applications. This section shows the basic system types. Standalone In a typical standalone setup, a single Reader scans bar codes on the side of a package moving down a conveyor.

  • Page 14: Distributed (Master-Slave, Dh-485)

    1–6 Overview Distributed (DeviceNet Master/Slave, DH-485) The distributed application below shows three Readers scanning bar codes at different points in an assembly process. Data from any Reader is individually sent to a controller. The discrete I/O on each Reader provide distributed control independent of the PLC monitoring the process.

  • Page 15: Distributed (Peer-To-Peer)

    Overview 1–7 Distributed (DeviceNet Peer-to-Peer) Peer-to-Peer communications allows a single Reader to gather data from other Readers over a DeviceNet network. The Reader then transfers the collected data to a host, such as a controller, over an RS-232 link. Readers through transfer data over a DeviceNet network to Reader...

  • Page 16: Scanning Modes

    1–8 Overview Scanning Modes You can configure a Reader as either a linear or raster scanner. The orientation of the bar code label with the scanner usually determines the scanning mode appropriate for the application. Linear Mode Scan Line Elevation Scan Line Elevation is adjustable.

  • Page 17: Wiring Base

    Overview 1–9 Wiring Base The Reader plugs into a wiring base. All wiring base connections are made using common electrician tools. Install the Reader after the wiring base is installed to reduce the possibility of damage. Reader Wiring Base Four conduit entrances Terminal Blocks for I/O Modules...

  • Page 18: Reader Connector

    1–10 Overview Reader Connector The Reader plugs into this connector. All power and communications with the Reader occurs through this connector. I/O Module Sockets Two sockets support any combination of the following input and output modules. See specifications in Appendix A. Description Catalog Number DC Output Module –...

  • Page 19: Communication Options

    Overview 1–11 Communication Options This section defines the communication options for the Reader. DeviceNet Network AdaptaScan Readers support both DeviceNet Master/Slave and Peer-to-Peer protocols. On a DeviceNet Master/Slave network, Readers and other DeviceNet slave devices communicate with a DeviceNet Scanner (Master). Up to 63 slave devices are allowed on a master/slave network.
  • Page 20 1–12 Overview RS-422 / RS-485 An RS-422 / RS-485 port allows point-to-point communications with a single device. Through the RS-485 port, the AdaptaScan Reader can also communicate with a DH-485 network. Both master and slave modes are supported. As a master device, the Reader sends data directly to an SLC 5/03 or 5/04 processor’s data table;...

  • Page 21: Protocols

    Overview 1–13 RS-232 The RS-232 port provides point-to-point communications with a device having an RS-232 port, such as a PLC-5 Channel 0 port or computer. PLC-5 Channel 0 (Configured for RS-232) Reader RS-232 Protocols The RS-485/RS-422 and RS-232 serial ports support these protocols. Protocol Description A peer-to-peer protocol that combines features of ANSI X3.28-1976...

  • Page 22: Adaptascan Software (Catalog No. 2755-Asn)

    1–14 Overview AdaptaScan Software The AdaptaScan Software (Catalog No. 2755-ASN), a Windows (Catalog No. 2755-ASN) based package, lets you configure a Reader through a series of menus, tools and dialog boxes. Context sensitive help is available to assist with use of the software. All Reader functions are configured from the Project dialog shown below, providing a single point of access for all operations.

  • Page 23: Scanning Parameters

    Overview 1–15 Scanning Parameters You can configure the Reader for linear or raster scanning. Setup dialogs determine when and how the laser scans a bar code symbol. Raster Setup Linear Setup Focus Options The Reader has a variable focus distance. The software supports manual, preset, and focus options.

  • Page 24: Decoding Operations

    1–16 Overview Decoding Operations Menus and dialog boxes also define parameters that determine when and how decoding occurs and the destination of the data. System Monitoring The software monitors a Reader on the network. Use this feature for initial setup and adjustment. Online Adjustments Make online adjustments to one or more Readers on a DeviceNet network using the Apply button which is available on specific...

  • Page 25: Safety Labels

    Overview 1–17 Safety Labels The Readers use a visible laser diode. As with any bright light source, such as the sun, you should avoid staring directly into the beam. Momentary exposure to a CDRH Class II laser product is not known to be harmful.

  • Page 26: Ordering Information

    1–18 Overview Ordering Information The following Readers are available. Item Description Catalog No. 300 scans per second, raster/linear scan, 2755-SN3 VLD, scanner/decoder 500 scans per second, raster/linear scan, 2755-SN5 Reader VLD, scanner/decoder 800 scans per second, raster/linear scan, 2755-SN8 VLD, scanner/decoder Contact Allen-Bradley for availability.

  • Page 27: Installation Considerations

    Chapter Installation Considerations Chapter Objectives This chapter describes important factors that affect how the AdaptaScan Bar Code Reader is oriented in respect to package or component labels. Section Page Orientation Factors 2–1 Reader Scan Beam 2–1 Picket Fence or Step Ladder Orientation 2–2 Skew, Pitch, and Tilt 2–3...

  • Page 28: Picket Fence Or Step Ladder Orientation

    2–2 Installation Considerations Picket Fence or The Reader supports raster and linear scanning. The Reader can be Step Ladder Orientation mounted in either a step ladder or picket fence orientation with respect to the bar code label. The type of scanning and the placement of the bar code label usually determines the orientation.

  • Page 29: Skew, Pitch And Tilt

    Installation Considerations 2–3 Skew, Pitch and Tilt The skew, pitch and tilt of a bar code symbol affect its readability. Symbols that are pitched or skewed up to 45_ are still readable. Although some skew is needed (see below), it should not exceed 45_.

  • Page 30: Usable Beam Width

    2–4 Installation Considerations Usable Beam Width The usable beam width depends on the Reader type, the scan angle and the distance from the bar code symbol. Make sure that the scan beam is wide enough for the area you are scanning. Increasing the scan angle setting (using configuration software) or moving the Reader away from the symbol increases the beam width.
  • Page 31 Installation Considerations 2–5 Maximum Usable Beam Width (Catalog No. 2755-SN5) At This Distance: Usable Beam Width Is: 51.0 inches (1.30 meter) 70 inches (1.78 meter) 47.3 inches (1.20 meter) 65 inches (1.65 meter) 43.7 inches (1.11 meter) 60 inches (1.52 meter) 40.0 inches (1.02 meter) 55 inches (1.40 meter) 36.4 inches (.92 meter)

  • Page 32: Apparent Element Width

    2–6 Installation Considerations Apparent Element Width An element is either a bar or space between bars in a bar code. The maximum read range is determined by the narrowest element. If the bar code symbols are pitched with respect to the Reader, the apparent width of the bar code elements is reduced.

  • Page 33: Reader Adjustments

    Installation Considerations 2–7 Reader Adjustments You can adjust the scan beam after the Reader is installed. Online adjustments can affect the width and location of the scan beam. Use these adjustments to fine-tune an application, not to compensate for improper installation. Chapter 6 describes how to make these adjustments.

  • Page 34: Read Ranges

    2–8 Installation Considerations Read Ranges The following tables show tabular read range limits for the three versions of the AdaptaScan Readers. Table 2.A Read ranges based on four character Code Read Ranges, Catalog No. 2755-SN3 39 labels with a wide to narrow bar ratio of 2.6 to 1 and a print contrast ratio of .75 or Minimum Apparent Element Width Read Range...

  • Page 35: Calculating Scans Per Label

    Installation Considerations 2–9 Calculating Use the following formulas to calculate the number of scans per Scans per Label label and the minimum number of scans per second needed for an application. The minimum scan speed required is based on five scans per label.

  • Page 36: Installing The Wiring Base And Power Supply

    Chapter Installing the Wiring Base and Power Supply Chapter Objectives This chapter describes how to install and mount the wiring base. Section Page General Mounting Guidelines 3–1 Dimensions and Clearances 3–2 Mounting the Wiring Base 3–4 Conduit and Cable Connections 3–6 Mounting Bracket 3–8...

  • Page 37: Dimensions And Clearances

    3–2 Installing the Wiring Base and Power Supply Dimensions Make sure there is adequate space around the Reader for: and Clearances Mounting and removing the Reader Wiring base connections Configuration cable Reader Front View Midpoint Scan Line 3.57 Inches (91 mm) 7.14 Inches (182 mm) Side View...

  • Page 38: Wiring Base

    Installing the Wiring Base and Power Supply 3–3 Wiring Base The wiring base is available in two versions: U.S. Version (Catalog No. 2755-NB40) Metric Version (Catalog No. 2755-NB41) The dimensions are identical for both versions. Differences are in the thread sizes of the conduit holes and the bottom mounting holes. 3.87 Inches 5.36 Inches (98 mm)

  • Page 39: Mounting The Wiring Base

    3–4 Installing the Wiring Base and Power Supply Mounting the There are 2 options for mounting the wiring base (Catalog No. Wiring Base 2755-NB40 or -NB41): Top Mounting – Mount the base using 3 screws through the top mounting holes. Bottom Mounting –...

  • Page 40: Bottom Mounting

    Installing the Wiring Base and Power Supply 3–5 Bottom Mounting The wiring base mounts from the bottom to any flat surface with three mounting screws. The holes on the U.S. version have #10-32 UNF-2B threads. The holes on the metric version have M5 x .8 threads.

  • Page 41: Conduit And Cable Connections

    3–6 Installing the Wiring Base and Power Supply Conduit and Cable All permanent Reader connections are made to the wiring base. Connections Wiring connections are made with conduit or cables. The conduit openings in the wiring base are different for the U.S. and metric versions.

  • Page 42: Conduit

    Installing the Wiring Base and Power Supply 3–7 Conduit Use flexible conduit whenever possible. This allows you to adjust the position of the Reader (when mounting bracket is used). Conduit Fitting User Supplied Conduit Hole Plug (Metric ) Hole Plug (U.S.

  • Page 43: Mounting Bracket

    3–8 Installing the Wiring Base and Power Supply Mounting Bracket The mounting bracket kit (Catalog No. 2755-NM42) is suitable for a variety of applications. This bracket allows you to mount the Reader at just about any angle or degree of rotation. Kit Contents The mounting bracket kit contains: Adjustable mounting bracket...

  • Page 44: Top Post Mounting

    Installing the Wiring Base and Power Supply 3–9 Top Post Mounting The mounting plate attaches to the bottom of the wiring base with three screws (see next page). The mounting bracket post is threaded into the hole at the center of the mounting plate. Lock the mounting post in position by tightening the locking knob.

  • Page 45: Side Post Mounting

    3–10 Installing the Wiring Base and Power Supply Side Post Mounting The mounting plate attaches to the bottom of the wiring base with three screws that are provided with the base. The mounting bracket post (flat side) attaches to the mounting plate with two hex socket screws.

  • Page 46: Installing The Safety Wire

    Installing the Wiring Base and Power Supply 3–11 Installing the Safety Wire Install the safety wire whenever the mounting bracket is installed in an inverted position. The safety wire prevents the Reader from dropping to the floor when the bracket locking knob is loosened. Attaches to Mounting Plate Screw Safety Wire...

  • Page 47: Power Requirements

    3–12 Installing the Wiring Base and Power Supply Power Requirements The Reader requires 14 watts (maximum) of power. The Reader accepts 11 to 28 VDC at either one of the two DeviceNet terminal blocks (terminals 1 & 5), even if DeviceNet is not used. 11-28 11-28 VDC+...
  • Page 48 Installing the Wiring Base and Power Supply 3–13 Catalog No. 2755-PW46 Power Supply The 120 VAC Power Supply (Catalog No. 2755-PW46) provides power to one AdaptaScan Bar Code Reader. It is not rated for industrial environments and must be mounted in a clean, dry location or a suitable enclosure.

  • Page 49: Power Connections

    3–14 Installing the Wiring Base and Power Supply Power Connections Single Reader Power Connection Below is a single power supply (Catalog No. 2755-PW46, -PW47) providing power to a single Reader. Do not connect other DeviceNet power supplies to the 2755-PW46 or -PW47 supply. Use a shielded cable (Belden 9316 recommended) when making power connections.

  • Page 50: Multiple Reader Connections Using Other Power Supply

    Installing the Wiring Base and Power Supply 3–15 Reader 1 Reader 2 Reader 3 Other DeviceNet Devices Ground V- at One Place 24V+ 24V+ 24V+ Ground Screw Ground Screw Ground Screw on Wiring Base on Wiring Base on Wiring Base Ground Screw on Wiring Base See DeviceNet Cable System Planning and Installation Manual...

  • Page 51: Devicenet Connections

    3–16 Installing the Wiring Base and Power Supply DeviceNet Connections For network wiring, the wiring base has two DeviceNet terminal blocks; one for incoming power and communications, the other for outgoing power and communications. DeviceNet communications requires 3 wires (2 communications, 1 ground) and a shield. You can install the Reader in a single or multiple drop configuration.

  • Page 52: Connections

    Installing the Wiring Base and Power Supply 3–17 RS-485 and RS-422 The wiring base has an RS-485/RS-422 terminal block for Connections point-to-point or network communications. Up to 32 devices can be installed on a single DH485 network. Important: The DH485 network cable requires proper shielding, grounding, and termination.

  • Page 53: Rs-232 Connections

    3–18 Installing the Wiring Base and Power Supply RS-232 Connections The RS-232 port provides point-to-point communications at distances up to 50 feet (15.2 meters). Use the RS-232 port for a direct connection to a controller, personal computer, or other device that supports one of the protocols (terminal, Allen-Bradley DF1, Allen-Bradley DH485).

  • Page 54: I/O Modules And Wiring

    Installing the Wiring Base and Power Supply 3–19 I/O Modules and Wiring The wiring base supports 2 optional input or output modules. Any of these modules can be used. These modules function like switches, they do not supply a voltage. Refer to Appendix A for specifications. ATTENTION: The wiring base contains hazardous voltages which can cause shock, burns or death.

  • Page 55: Output Module Application

    3–20 Installing the Wiring Base and Power Supply Output Module Application Shown below is a typical output module application. When connecting high impedance loads, you may need to add a resistor in parallel with the load. This resistor (typically 300 to 6,000 ohms) provides a continuous minimum current flow (10 mA DC or 50 mA AC) through the output module in the closed state.

  • Page 56: Input Module Application

    Installing the Wiring Base and Power Supply 3–21 Input Module Application External Power Source A typical input module application using external power source: External Fuse Input Contacts Recommended – + AC or DC Source The module and the switch receive power from an external AC or DC source.

  • Page 57: Package Detector

    3–22 Installing the Wiring Base and Power Supply Package Detector The package detect input accepts only a current sinking output. Allen-Bradley Photoswitchr package detectors are recommended. Select a switch from the PhotoSeries 6000 or 9000 product line that best suits your application. Make sure you order a sinking (12V DC) type sensor.
  • Page 58 Installing the Wiring Base and Power Supply 3–23 The following is a typical package detector configuration: Package Detector Reflector Connect the package detect wiring to the wiring base as shown. Note: If you are using a sensor with mechanical contacts, refer to page 3–21 for wiring connections to an input module.

  • Page 59: Chapter Objectives

    Chapter Installing / Removing the Reader Chapter Objectives This chapter describes how to install the Reader on the wiring base. Section Page Installation 4–1 Power-up Sequence 4–2 Checking Reader Operation 4–2 Replacing a Reader 4–3 Installation The Reader plugs into the connector on the wiring base. Install the Reader with or without the power disconnected from the wiring base.

  • Page 60: Power-Up Sequence

    4–2 Installing / Removing the Reader Power-up Sequence On initial power-up, the Reader performs a series of self-diagnostic tests and LED tests (all LEDs flash). When the Module LED flashes and turns a steady green the power-up sequence is complete. The complete power-up sequence takes a few seconds.

  • Page 61: Replacing A Reader

    Installing / Removing the Reader 4–3 Replacing a Reader To replace a Reader: Note: If you are installing more than one Reader on a network, install each Reader one at time and change the DeviceNet address before installing the next Reader. 1.

  • Page 62: Chapter Objectives

    Chapter Downloading Configurations Chapter Objectives This chapter describes how to download a configuration between the Reader and a personal computer running the AdaptaScan software. Section Page Connecting a Personal Computer 5–1 Downloading Firmware 5–3 Downloading a Configuration 5–4 Connecting a AdaptaScan Bar Code Reader configurations and firmware are Personal Computer downloaded:...
  • Page 63 5–2 Downloading Configurations The following figure shows the connections for downloading firmware or a Reader configuration. 9 to 25 Pin Adapter may be required Configuration Cable (Catalog No. 2755-NC48) 9 Pin Male D Connector 4 Pin Female Personal Computer Circular Connector Configuration Port Connector (Has a protective cap)

  • Page 64: Downloading Firmware

    Downloading Configurations 5–3 Downloading Firmware This section shows the procedure used to download new firmware to the AdaptaScan Bar Code Reader. Each Reader is shipped with factory default firmware. The software will prompt you if you need to download new firmware. Verify that your computer is connected to a Reader as shown on previous page.

  • Page 65: Downloading A Configuration

    5–4 Downloading Configurations Downloading This section shows how to download a configuration to one or more a Configuration Readers. Verify that your computer is connected to a Reader as shown on previous page. To download a configuration to a Reader: 1.

  • Page 66: Chapter Objectives

    Chapter Troubleshooting and Maintenance Chapter Objectives This chapter describes how to isolate and correct the most common operating problems and perform routine maintenance tasks. Section Page Using the Troubleshooting Chart 6–1 Technical Support 6–1 Equipment Required 6–1 Troubleshooting Chart 6–2 LED Indicators 6–3 Cleaning the Scan Window...
  • Page 67 6–2 Troubleshooting and Maintenance Troubleshooting Chart Table 6.A Troubleshooting Chart Problem Probable Cause(s) Corrective Action(s) Reader does not power up. No LED indicators 1. Improper connection to power source. 1. Check power source. illuminate. 2. Power source not providing 12 to 28 2.

  • Page 68: Led Indicators

    Troubleshooting and Maintenance 6–3 LED Indicators Use the 7 LED indicators to isolate operating problems. Figure 6.1 LED Indicators On Symbol Condition Indication Yellow Bar code symbol is being scanned and decoded. Flashing Bar code symbol is being read at less than 100% rate. Not reading bar code symbol.
  • Page 69 6–4 Troubleshooting and Maintenance Network Condition Indication Green Normal DeviceNet operating state. Flashing Green Communication link established but no data transfer. DeviceNet communication fault detected. Flashing Red One or more DeviceNet devices are not responding. Reader may not be able to perform all configured functions. No DeviceNet communications established.

  • Page 70: Cleaning Scan Window

    Troubleshooting and Maintenance 6–5 Cleaning Scan Window ATTENTION: Other than cleaning the scan window, no user maintenance of the Reader is required. Do not open the enclosure! For optimum performance the scan window should be clean. ATTENTION: Only use reagent grade alcohol to clean the window.

  • Page 71: Replacing Scan Window

    6–6 Troubleshooting and Maintenance Replacing Scan Window The scan window fits into an opening behind the front of the Reader. A bezel and gasket create a NEMA Type 4 seal. The table below lists numbers for ordering a glass or plastic window kit.
  • Page 72 Troubleshooting and Maintenance 6–7 3. Remove the six #6-32 screws from the bezel/window assembly. 4. Carefully pull bezel/window assembly away from the front of the Reader. 5. Discard the old bezel/window assembly. To install the replacement scan window: 1. Do not smudge the window when removing the bezel/window assembly from package.
  • Page 73 Appendix Specifications Electrical Voltage 11 to 28V DC Power 14 Watts maximum Mechanical NEMA Type 4 (when used with properly sealed Enclosure wiring base) LED Indicators On Symbol Yellow Trigger Read Yellow/Green Input / Output #1 Yellow Input / Output #2 Yellow Network Green/Red...
  • Page 74 A–2 Specifications Optical Light Source Visible Laser Diode (TE Cooled) Wavelength 660 nm Output Power 1.0 mW maximum Scan Rate (Nominal) Catalog No. 2755-SN3 300 Scans/Second Catalog No. 2755-SN5 500 Scans/Second Catalog No. 2755-SN8 800 Scans/Second Optical Scan Angles Catalog No. 2755-SN3 22_ to 72_ Catalog No.
  • Page 75 Specifications A–3 Certifications UL Listing UL Listed LISTED UL Listed to Canadian safety standards LISTED European Union Directive Electromagnetic Compatibility Directive (89/336/EEC) EN 50081-2 Generic Emission Standard - Industrial Environment EN 50082-2 Generic Immunity Standard - Industrial Environment...
  • Page 76 Appendix DIN Rail Mount Terminal Blocks This appendix lists Allen-Bradley DIN Rail Mount Terminal Blocks (with diodes, fuses and resistors) that are available for use with the input or output module applications described in Chapter 3. Refer to Publication 1492-1.0 for ordering and application information. DIN RAIL MOUNT Terminal Block Type Catalog Number Voltage Rating...
  • Page 77 Appendix European Union Directive Compliance Installation Requirements If this product is installed within the European Union or EFTA regions, the following regulations apply. EU Directive Compliance This apparatus is tested to meet Council Directive 89/336 Electomagnetic Compatibility (EMC): EN 50081-2 Class A (Industrial) Emissions EN 50082-2 Class A (Industrial) Immunity...
  • Page 78 C–2 European Union Directive Compliance Declaration of Conformity...
  • Page 79 Glossary An ASCII control character used to acknowledge the reception and acceptance of a transmission block. address 1) A character string that uniquely identifies a memory location. 2) A character string that uniquely identifies the physical location of an input or output circuit. Automatic Identification Manufacturers.
  • Page 80 G–2 Glossary The dark element of a printed bar code. bar code An array of parallel rectangular bars and spaces that together represent data elements or characters in a particular symbology. The bars and spaces are arranged in a predetermined pattern following unambiguous rules defined by the symbology.
  • Page 81 Glossary G–3 capture count The number of consecutive identical valid decodes that result in a valid read. character One symbol of a set of symbols that normally includes both alpha and numeric codes plus punctuation marks and other symbols that may be read, stored, or written.
  • Page 82 G–4 Glossary continuous code A bar code symbology where all spaces within the symbol are parts of the characters (Interleaved 2 of 5). There is no interactive gap in a continuous bar code symbology. Characters per inch. See density. data character See character.
  • Page 83 Glossary G–5 element width The thickness of an element measured from the edge closest to the symbol start character to the trailing edge of the same element. encoded area The total linear dimension consisting of all the characters of a code pattern, including start and stop characters and data.
  • Page 84 G–6 Glossary inter-symbol no–read count The minimum number of no–reads that must occur between symbols scanned when Self–Triggered (continuous decode) is selected as the decode trigger. Symbols that are not preceeded by the minimum nuber of no–reads are ignored. intercharacter gap The space between two adjacent bar code characters in a discrete code (spaces between characters in Code 49).
  • Page 85 Glossary G–7 find and replacement strings. There are both metacharacter search and replacement characters. misread A condition which occurs when the data output of a reader does not agree with the encoded data presented. modulo check digit or character A calculated character within a data field used for error detection. The calculated character is determined by a modulus calculation on the sum or the weighted sum of the data field contents.
  • Page 86 G–8 Glossary orientation The alignment of bars and spaces to the scanner. Often referred to as Picket Fence or Step Ladder. output counter A counter that is associated with each output condition. The counter increments by 1 each time the condition occurs. parity bit An additional non-data bit attached to a binary word to provide a check of the data integrity by making the sum of the number of ones...
  • Page 87 Glossary G–9 quiet zone Spaces preceding the start character of a symbol and following the stop character. Sometimes called the clear area. read A condition in which an entire package is decoded. reader A device comprised of a scanner and a decoder. RS-232C An EIA standard that specifies electrical, mechanical, and functional characteristics for serial binary communication circuits in a...
  • Page 88 G–10 Glossary self-checking A bar code or symbol using a check algorithm which can be applied to each character to guard against undetected errors. Codes without self-checking may employ a check digit or other redundancy in addition to the data message. sensor A device that detects or measures something and generates a corresponding electrical signal to an input circuit of a controller.
  • Page 89 Glossary G–11 symbology The conventions, or rules, which govern the formation of characters and strings of characters in a bar code symbol. symbology identifier An optional three character code which may prefix transmitted data from a bar code reader indicating the symbology read and any options enabled in the reader or special features of a symbology encountered (presence of FNC 1 in Code 128).
  • Page 90 G–12 Glossary X dimension The nominal dimension of the narrow bars and spaces in a bar code symbol.
  • Page 91 Index Index accessories, 1–18 Apparent element width, 2–6 European Union Directive Compliance, C–1 Applications, 1–5 distributed (master–slave), 1–6 distributed (peer–to–peer), 1–7 standalone, 1–5 Flyback enabled, 1–8 Autofocus, 1–15 automatic focus, 1–15 manual, 1–15 preset, 1–15 Hole plugs, wiring base, 3–7 Baud rate,, DeviceNet network, 1–11 I/O LEDs, 6–3 I/O module sockets, 1–10...
  • Page 92 I–2 Index RS–232 communications, 1–13, 3–18 RS–232 terminal block, 1–9 On Symbol Indicator, 6–3 RS–422 communications, 1–12 Operating environment, 1–4 RS–422/RS–485 terminal block, 1–9 Output module application, 3–20 RS–485 communications, 1–12 Output Modules, Specifications, A–2 network or point–to–point, 3–17 termination, 3–17 Package detect terminal block, 1–10, 3–22 Picket Fence Orientation, 2–2 Safety labels, 1–17...
  • Page 93 Index I–3 dust cover, 3–5 hole plugs, 3–7 Usable beam width I/O module sockets, 1–10 catalog no. 2755–SN3, 2–4 I/O module terminal blocks, 1–10 catalog no. 2755–SN5, 2–5 mounting guidelines, 3–1 catalog no. 2755–SN8, 2–5 Reader connector, 1–10 package detect terminal block, 1–10 power connections, 3–12 RS–232 terminal block, 1–9 Wiring base...
  • Page 94 Code 39 HIGH DENSITY MEDIUM DENSITY N B W 0 0 7 5 LOW DENSITY HIGH DENSITY Code 128 MEDIUM DENSITY NBW= 0 0 7 5 LOW DENSITY Interleaved 2 of 5 HIGH DENSITY MEDIUM DENSITY LOW DENSITY 0 0 1 0 0 0 2 0 Universal Product Code VERSION A...
  • Page 95 PART NO. (P) QUANTITY (Q) 27842 SUPPLIER (V) 9106 SERIAL (S) 0 0 0 1 2 3 4 5 6 7 8 9 0 9 00 38200 11413...
  • Page 96 Rockwell Automation helps its customers receive a superior return on their investment by bringing together leading brands in industrial automation, creating a broad spectrum of easy-to-integrate products. These are supported by local technical resources available worldwide, a global network of system solutions providers, and the advanced technology resources of Rockwell. Worldwide representation.

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