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Funktional Safety


679


The speed monitoring device Kübler Safety-M compact safety module

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Contact person

Filippo Zerbo
Tel.: +49 7720 3903-80

Technical information
info@kuebler.com


Kübler is expanding its products portfolio in the area of functional safety. In order to provide safe interaction between man and machine, Kübler is offering a new safety module. The basic module of the Safety-M compact series is a complete speed monitoring device requiring a minimum of space. The removable operating and diagnostic display stands for easy parameterizing. The safe inputs and outputs and the integrated signal splitter allow its integration in existing safety circuits.

Simple retrofitting of safety technology is a decisive point, especially for older machines, which have to undergo important modifications to meet the requirements of Machinery Directive 2004/42/EC. In costsensitive plants, in addition to the easy retrofitting, the economic aspect of a highquality speed monitoring device also plays an important role.

The integrated signal splitter for the encoder signals saves expensive and complex external wiring. Moreover, the easy forwarding to a control system or frequency converter is ensured.

The device firmware integrates comprehensive speed and positionrelated safety functions for drive monitoring according to EN 61800-5-2 (e.g. SS1, SS2, SOS, SLS, SDI, SSM). The extensive diagnostic function integrated in the firmware allow achieving, with a certified encoder, the safety level SIL3/PLe.

The encoder interface supports SinCos, TTL / RS422 and HTL / push-pull and proximity switches. Up to two safe encoder connections can be achieved per axis. 4/2 safe inputs and 8/4 safe shut-off channels are available. The analog output ranges from 4 ... 20 mA and provides a fast internal speed signal conversion.

Kübler offers a removable OLED touch screen with plain text display as an accessory. It allows performing local diagnostics and parameterizing without PC software. The status LED on the front side indicates the operating status oft he device.

Contact multiplication or contact reinforcement by means of external contactors combined with integrated cross short-cut monitoring (EDM) is possible.



684


BiSS goes Safety open-source, fully digital, bidirectional and safe.

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Press release
Press release
Press release

Picture, high resolution

Contact person

Filippo Zerbo
Tel.: +49 7720 3903-80

Technical information
info@kuebler.com


The communication between the encoder and the processing unit is a decisive factor for the interference-free and reliable control of machines and plants.
This leads to the question of the suitable interface for the application. Safety-oriented interfaces are currently one of the main innovation trends in the electrical drive technology. Kübler follows this trend with new encoder solutions. This sensors manufacturer early relied for its target branches drive and elevator technology on the fully digital special interface BiSS, predestined by its features for use as a bidirectional motor feedback system for linear and rotary axes. Today the company is convinced that it was totally right, as this open source protocol has in the meantime become integral part of these branches. The "BiSS-Safety" protocol expansions allow realizing automation systems that meet all requirements in terms of Functional Safety and in the same time offer hitherto unknown flexibility and cost-efficiency.

From the Pioneer to the established interface

With its absolute encoders for the drives technology, Kübler belongs to the pioneers among the users of the open source interface BiSS, which has been launched on the market already in 2002. This protocol transmits position and status data in real time and therefore faster than field bus or Ethernet systems. Today, this interface, which is now well-established, is much more than just a protocol for Kübler. In the drives and elevator technology, BiSS provides the encoders with the determining features required by these branches. BiSS Safety, the latest development of this interface, impressively demonstrates this. Kübler's Safety encoders offer significant added value in view of the strict safety requirements, especially with the new BiSS Safety interface, which is certified up to SIL3 and can be implemented without changes in the system architecture.
BiSS systems do not only determine the "here and now", but BiSS will demonstrate its strengths also in the framework of Industry 4.0.

BISS-Safety: typically BiSS - and nevertheless new

In this innovative environment, BiSS has made a name for itself among the many solutions and - mostly proprietary - systems, not least because of its adaptability. Having been developed in a farsighted perspective, the BiSS interface always reacts flexibly to new challenges. This also applies to the further innovative step of this protocol, BiSS Safety. BiSS Safety is 100 percent based on BiSS-C. This means that the external structure remains a point-to-point connection as for BiSS-C. But inside the device, two independent sensors are used for generating the position data and securing the transmission. BiSS Safety uses the 'Black Channel' approach for safe transmission. To that purpose, two independent position words are transmitted together in a cycle: the position data for the control (Control Position Word) and the position data for safety monitoring (Safety Position Word). In the device, both sensors use the BiSS bus structure and measure simultaneously the position. The Control Position Word (CPW) offers an increased resolution for accurate control applications and, including status information and CRC polynomial, it is identical with the position word of a standard BiSS encoder. Depending on the application, the CPW can be processed directly by a drive controller.

The Safety Position Word (SPW) provides the position for comparison with the CPW and includes, in addition to the standard status information, a 'sign-of-life' counter. This counter differentiates one single start status '0' and continuously counted cycles 1 to 63. With typical cycle times, the standardized length of 6 bits covers unequivocally time periods in the millisecond range. The 16-bit CRC polynomial in the SPW moreover allows for a high failure detection rate and Hamming distance.
The different structures of the CPW and of the SPW combined with the serially arranged BiSS hardware structure ensure clear identification of interchange errors or repeated errors. To check the transmission, BiSS Safety compares the two independent position values of the CPW and of the SPW.
For the BiSS Safety drive controller manufacturers, the infrastructure for data transmission and identification remains preserved. From the safety point of view, communication must be implemented and monitored in the drive controller. The already existing hardware can be used for this purpose for BiSS Safety, existing concepts can be applied.

The Safety Communication Layer of BiSS Safety has been checked in 2015 by TÜV Rheinland and its suitability for safety-relevant communication up to SIL3 included according to IEC 61508:2010 confirmed in compliance with DIN EN 61784-3:2010-02.