Barcode
Introduction
A barcode is an optical, machine-readable representation of data used for identification, tracking and automation within logistics, industrial and administrative processes. Barcodes consist of patterns of lines, spaces or geometric shapes that are read by scanners, cameras or vision systems.
In industrial automation, barcodes play an important role in:
- Product identification
- Asset Management
- Production tracking
- Supply Chain Management
- WMS
- MES
- Quality control
- Track-and-trace systems
- Warehouse automation
Barcodes are an essential part of modern digital production environments and support integration between physical products and digital systems such as ERP, SCADA, LIMS and CMMS.
⚙️ How a barcode works
A barcode encodes data in visual patterns that are interpreted by a scanner.
The process typically works as follows:
- The barcode is printed or displayed
- The scanner illuminates the code
- A sensor detects reflectance differences
- Software decodes the pattern
- The data is forwarded to application systems
For linear barcodes, this happens via:
- Black lines
- White spaces
- Variable widths
For 2D codes, via:
- Square patterns
- Matrix structures
- Position markers
- Error correction data
The scanner translates this into usable information such as:
- Item number
- Serial number
- Batch number
- Production date
- Location code
- Asset ID
🏭 Applications in industrial automation
In Industrial Automation, barcodes are used for identification of:
| Application | Example |
|---|---|
| Product tracking | Products on production lines |
| Asset management | Machines and components |
| Inventory management | Warehouse locations |
| Maintenance | Work orders and spare parts |
| Quality control | Batch and lot recording |
| Traceability | Product history |
| Logistics | Shipping labels |
| Safety | PPE and access control |
In production environments, barcodes are often linked to:
This creates real-time synchronisation between physical processes and information systems.
🔢 Types of barcodes
Barcodes exist in various formats.
1D barcodes
Linear barcodes contain information in horizontal lines.
Commonly used types:
| Barcode | Use |
|---|---|
| EAN-13 | Retail products |
| Code 128 | Logistics |
| Code 39 | Industry |
| ITF-14 | Packaging |
| UPC | Retail |
| GS1-128 | Supply chain |
Characteristics:
- Relatively simple
- Cheap to print
- Limited storage capacity
- High read speed
2D barcodes
2D codes store data in multiple directions.
Examples:
| Type | Property |
|---|---|
| QR-code | High storage capacity |
| DataMatrix | Compact industrial use |
| PDF417 | Large datasets |
| Aztec | Transport sector |
Benefits:
- More data storage
- Error correction
- Compact format
- Faster validation
- Readable when damaged
In industrial environments, DataMatrix is widely used because of its high reliability on small surfaces.
🧾 GS1 standards
Many industrial barcode implementations use GS1 standards.
GS1 defines:
- Number structures
- Product identification
- Supply chain coding
- Tracking structures
- Interoperability
Commonly used GS1 elements:
| Element | Function |
|---|---|
| GTIN | Product identification |
| SSCC | Shipping units |
| Batch number | Traceability |
| Serial number | Unique identification |
| Production date | Lifecycle tracking |
GS1-128 supports multiple data fields within a single barcode.
Examples:
- Product ID
- Expiry date
- Batch code
- Weight
- Serial number
🏗️ Integration with OT systems
Barcodes are strongly integrated within OT processes.
Examples of integrations:
| System | Function |
|---|---|
| PLC | Product detection |
| SCADA | Visualisation |
| MES | Production orders |
| ERP | Inventory management |
| Historian | Traceability |
| Robotics | Positioning |
| Vision systems | Validation |
A barcode scan can, for example:
- Configure a production line
- Load a recipe
- Start batch recording
- Change machine parameters
- Determine product routing
This makes barcodes an important part of automated production flows.
⚡ Barcode scanning in real-time production processes
In production environments, scanning has high requirements.
Important factors:
| Factor | Importance |
|---|---|
| Scan latency | Real-time processing |
| Read reliability | Production continuity |
| Damage tolerance | Industrial conditions |
| Movement speed | Conveyor belt systems |
| Lighting | Reliable detection |
| Contrast | Scannability |
Industrial scanners often support:
- High scan speeds
- IP65/IP67 housings
- Industrial protocols
- Ethernet connectivity
- Real-time triggers
- Vision integration
Scanners are typically connected via:
- Industrial Ethernet
- ProfiNET
- Ethernet IP
- Modbus TCP
- Serial connections
🔍 Barcode verification and validation
Not every barcode is automatically reliably readable.
Validation processes therefore exist for:
- Contrast checking
- Symmetry
- Quiet zones
- Resolution
- Reflectivity
- Damage
In regulated sectors such as pharmaceuticals and food production, barcode validation is essential for compliance.
Typical applications:
- GMP
- FDA
- Tracking and Tracing
- Medical devices
- Pharmaceutical serialisation
Vision systems automatically check the quality of printed codes.
🔐 Security aspects of barcodes
Although barcodes are often seen as simple identification means, cybersecurity and safety risks also exist.
Label manipulation
Attackers can:
- Replace barcodes
- Print fake labels
- Manipulate tracking information
- Falsify supply chain data
Malicious QR codes
QR-codes can point to:
- Phishing websites
- Malware downloads
- Fraudulent portals
Traceability fraud
In regulated production environments, manipulated barcodes can lead to:
- Incorrect batch information
- Wrong recalls
- Incorrect medication tracking
- Supply chain disruption
OT impact
Incorrect barcode information in OT environments can lead to:
- Wrong product configuration
- Wrong recipes
- Incorrect machine parameters
- Production line downtime
Barcode processes are therefore increasingly integrated into Cybersecurity and quality processes.
🌐 Barcode versus RFID
Barcodes are often compared with RFID.
| Property | Barcode | RFID |
|---|---|---|
| Line of sight needed | Yes | No |
| Cost | Low | Higher |
| Read distance | Short | Long |
| Write capability | No | Often yes |
| Data volume | Limited | Larger |
| Robustness | Medium | High |
| Bulk scanning | Limited | Good |
Barcodes remain popular thanks to:
- Low implementation costs
- Simplicity
- Worldwide standardisation
- High reliability
RFID is more often used where contactless detection is important.
🏭 Practical example: pharmaceutical production
A pharmaceutical production line uses DataMatrix codes for serialisation.
Process
Each package receives:
- GTIN
- Serial number
- Batch number
- Production date
Integration
The code is linked to:
Validation
Cameras check:
- Readability
- Correct content
- Duplicates
- Position on the packaging
Security
The environment uses:
- Audit logging
- Encrypted data sources
- Access control
- Integrity validation
This ensures the process meets pharmaceutical regulations and full traceability requirements.
⚠️ Limitations of barcodes
Despite their widespread use, limitations exist.
Sensitive to damage
Barcodes can become poorly readable due to:
- Dirt
- Wear
- Chemical exposure
- Reflection
- Poor print quality
Limited storage capacity
1D codes contain relatively little data.
Line of sight required
Scanners usually need direct visibility of the code.
Dependency on print quality
Poor printers or labels cause production disruption.
📈 The future of barcode technology
Barcode solutions are evolving towards:
- Smart packaging
- Vision AI
- Advanced serialisation
- Cloud-based traceability
- Integration with Digital Twin
- Real-time analytics
- Supply chain visibility
New developments combine:
- Industrial AI
- Vision systems
- Robotics
- Industrial Internet of Things
- Blockchain-based traceability
Despite the rise of RFID and vision-based identification, barcodes remain dominant worldwide thanks to their simplicity and interoperability.