IO-Link

Point-to-point communication standard for connecting sensors and actuators. Provides parameterization and diagnostics.

Type: Sensor-LevelSpeed: 4.8, 38.4, or 230.4 kbpsReleased: 2006Organization: IO-Link Community

230.4 kbps

Bandwidth

1 device per port

Max Nodes

20m standard cable

Max Distance

Yes

Real-Time

Protocol Overview

Point-to-point communication standard for connecting sensors and actuators. Provides parameterization and diagnostics.

When to Use IO-Link

Choose IO-Link for smart sensors, remote parameterization needs, predictive maintenance, or upgrading existing 3-wire sensor infrastructure.

Technical Specifications

Physical Layer

Physical Layer: 24V DC (IEC 61131-2)
Cable Type: Standard 3-wire sensor cable
Topology: Point-to-point
Power Over Cable: Yes

Data Layer

Data Link: IO-Link protocol
Encoding: NRZ
Error Detection: CRC-8
Frame Size: 32 bytes

Performance

Scan Time: <1ms typical
Deterministic: Yes
Real-Time: Yes

Certification

Certification Required: Yes
License Cost: Free for members of IO-Link Community
Version: V1.1

Advantages & Disadvantages

Advantages

✓Uses standard 3-wire sensor cables
✓Hot-swappable with auto-configuration
✓Remote parameterization
✓Rich diagnostic data
✓Device identification and replacement
✓Works with existing cables
✓Vendor-independent
✓Lower cost than fieldbus per port

Disadvantages

✗Point-to-point only (no multi-drop)
✗Requires IO-Link master
✗Limited distance (20m)
✗Not suitable for high-speed motion control
✗Requires IO-Link capable devices

Common Use Cases & Applications

Smart sensor integration

Remote sensor configuration

Predictive maintenance

Quality assurance systems

Process monitoring

Device diagnostics

Industry Adoption

Adoption LevelHigh and growing

Market Share20-25% of new sensor installations

Geographic PresenceWorldwide

Primary Industries

AutomotivePackagingFood & BeverageAssemblyProcess Industries

Supported Message Types

Process data

Service data

Events

Supported PLC Brands

Siemens

ifm

Balluff

Pepperl+Fuchs

Turck

Sick

Phoenix Contact

Omron

Protocol Comparisons

Quick Links

Alternative Protocols

AS-Interface
Analog signals
Discrete I/O

Related Standards

IEC 61131-3
International standard for programmable logic controller programming languages. Defines 5 programmin...
IEC 61131 Series
Complete series of international standards for programmable logic controllers covering hardware, sof...