Now with the Open Source One-Cable-Technology BiSS LINE
POSITAL’s new family of kit encoders provide the manufacturers of motors and other machinery with rugged, accurate and cost-efficient tools for building rotary position feedback into their products. The new kit encoders are based on POSITAL’s highly successful self-contained magnetic rotary encoders. Now however, the core components of these instruments are available as separate assemblies that can be readily integrated into other products.
The electronic interface for these encoders is based on non-proprietary BiSS Line and BiSS-C communications standards . Unlike proprietary, vendor-specific interfaces, these open-source standards are be supported by many manufacturers of sensors and motion controllers, freeing users from a “locked-in” relationship with a single supplier. Standard 4-wire RS485 connections are supported, so that motor manufacturers who adopt POSITAL kit encoders can often make use of existing connectors and cables. IP core software is available for FPGAs widely used in motion controllers. This reduces the development effort required to make use of BiSS communications technologies.
The BiSS Line standards also support a single cable approach to motor connections, with power and control wires combined in a single cable. Point-to-point or multi-slave network configurations are supported, simplifying wiring layouts in complex machines.
High Performance with Low Maintenance
The POSITAL kit encoder components offer advantages for motor and rotating equipment control feedback. Compared to analog resolvers, they provide improved accuracy and multiturn measurement capabilities. Their output is digital, which avoids the need for A/D converters in the control system. Compared to optical disk encoders, POSITAL’s magnetic encoders are less costly, less vulnerable to contamination from oil or dust and more resistant to shock and vibration. Multiturn absolute position measuring capability is based on an electronic rotation counter powered by the company’s well-proven Wiegand-effect energy harvesting technology . This system is self-powered, so rotation counts are always accurate, even if rotations occur when there is no control system power available. With no need for backup batteries and no need for periodic backup battery checks and replacements, maintenance requirements are significantly reduced.
POSITAL magnetic kit encoders are easy to incorporate into normal manufacturing processes since they don’t require near-cleanroom assembly conditions. A built-in self-calibration capability can be used to compensate for small sensor-to-shaft alignment errors occurring during assembly. The electronic components, including Hall-effect sensors, a 32-bit microprocessor and the Wiegand-wire energy harvesting system, are packaged in a convenient 36 mm diameter, 24.2mm deep unit. For servomotors with magnetic brakes, a special magnetic shield can be installed to isolate the magnetic pickups from external magnetic fields.
The resolution of the new POSITAL kit encoders is 17 bit, with an accuracy of better than +0.1°. The operating temperature range is -40 to +105 °C.
POSITAL PARTICIPATES IN LAUNCH OF BISS ASSOCIATION
New Organization promotes No-Charge, Open Source Interface Technology for Industrial Control Systems
POSITAL FRABA has announced that it is participating as a founding member of the BiSS Association e.V. , a new organization dedicated to encouraging the use of the BiSS family of open-source industrial communications protocols.
BiSS communications protocols were developed by the German company iC-Haus GmbH as an efficient and feature-rich digital interface for communications between industrial sensors, actuators and control devices. iC-Haus is also the source of ASIC chips that support the implementation of this interface in industrial devices such as sensors, actuators and controllers.
Features of the New BiSS Interface
The BiSS interface is hardware compatible with the well-established SSI (Serial Synchronous Interface) digital interface, but offers significant enhancements. BiSS supports continuous (real-time) communications between controllers and sensors. BiSS Safety offers functionality for critical systems where safety ratings up to SIL 3 are required. Applications of the BiSS interface include manufacturing robotics, motor feedback, servo drives & motion control, position encoders and CNC drives.
An important new development is BiSS Line – an implementation of BiSS protocols that can be deployed in a single cable configuration and features forward error correction (FEC). This makes BiSS Line an ideal interface for servomotors where the single cable feature offers a significant reduction in wiring system complexity.
BiSS is offered as an open source interface. There are no licensing fees for either manufacturers of BiSS-enabled devices or their customers. BiSS Association e.V. is autorized to grant free-of-charge BiSS licenses to device manufacturers and BiSS users. The agreement defines rights and duties to make use of associated patents and trademarks for BiSS held by iC-Haus.
New BiSS Association Organization
The new BiSS Association organization aims to expand the use of BiSS technology throughout the world. It will also provide a communications platform for technical standards and cooperative marketing initiatives. POSITAL FRABA’S Jörg Paulus has been appointed Vice Chairman of the association, joining Dr. Heiner Flocke of iC-Haus (Chairman) and Alexander Ehnert of Hengstler GmbH (Treasurer). Membership in the BiSS Association is open to all companies and institutions. Members can participate in the development and promotion of this exciting new interface. Access to BiSS technologies and licensing arrangements are open to members and non-members alike.