POSITAL Redundant Encoders
POSITAL redundant absolute encoders are designed for applications requiring functional safety and reliability in motion control systems. These devices integrate two independent sensing systems within a single compact housing to provide diverse redundancy, improving safety and error detection. They are widely used in industries where operational safety is critical, including construction machinery, mobile equipment, cranes, elevators, and stage technology.
IXARC Absolute Encoder Product FinderDiverse Redundancy
Redundant encoders from POSITAL incorporate two distinct sensor technologies—magnetic and optical—within one unit. This approach, known as diverse redundancy, ensures that measurements are independently cross-verified. If discrepancies arise between the two sensor readings, a connected functional safety PLC can detect the fault and initiate a transition to a safe state. This design significantly enhances safety compared to encoders that rely on identical redundant systems.
Functional Safety
POSITAL redundant encoders support functional safety requirements up to Performance Level d (PL d), Category 3, according to ISO 13849. While they are not SIL-certified themselves, they are suitable for safety-critical systems when used in conjunction with functional safety PLCs. This combination offers a flexible and cost-effective solution for achieving safety compliance.
Robust Design
Built to withstand harsh industrial environments, POSITAL redundant encoders feature:
Compact 58 mm diameter housing
Protection ratings up to IP67
Wide operating temperature range
Resistance to shocks, vibrations, and condensation
The magnetic sensor technology is particularly robust against dirt and moisture, while the optical sensor provides high precision. An integrated membrane reduces internal moisture buildup, enhancing reliability.
Key Features
Dual sensing technologies (magnetic and optical) for diverse redundancy
Functional safety up to PL d, Cat. 3
CANopen communication interface
Battery-free multi-turn counting
Variety of mechanical configurations: solid and hollow shafts
Applications
POSITAL redundant encoders are suitable for:
Heavy construction equipment
Cranes and lifting systems
Stage automation and theater technology
Installation and Integration
The all-in-one design simplifies installation compared to traditional setups requiring two separate encoders. The diverse-redundant encoders integrate seamlessly into functional safety systems via the CANopen interface. System integrators can program safety parameters in the PLC, tailoring the system response to specific requirements.
Advantages
Enhanced safety through diverse redundancy (magnetic + optical)
Compact and space-saving design
Cost-effective alternative to SIL-certified encoders
High durability in demanding environments
Flexible configuration options
