WIKA Mobile Control GmbH & Co. KG

Designing Safe Rated Capacity Limitation

With qSCALE RCL trueSafety, WIKA Mobile Control offers the first certified software library for rated capacity limitation (RCL, also known as LMI) of telescopic cranes

When mobile cranes lift and move heavy loads, the protection of people, material and machinery is the top priority. For this reason, functional safety combined with high availability plays an increasingly important role in the field of mobile cranes. Certified control solutions help to reduce safety risks – this applies not only to the hardware components, but also to the software. With qSCALE RCL trueSafety, WIKA Mobile Control presents the first software library certified acc. to DIN EN ISO 13849 for the rated capacity limitation (RCL) of telescopic cranes – and offers high flexibility in modular cSCALE control systems at the same time.

qSCALE RCL trueSafety: A Certified solution for rated capacity limitation

Safe rated capacity limitation – WIKA Mobile Control calls this: qSCALE RCL trueSafety. This solution for rated capacity limitation (RCL, also known as load moment indication or LMI), is a software library for mobile cranes that is certified according to DIN EN ISO 13849. The qSCALE RCL C library has been implemented with regard to functional safety and complies with the current EU standards. All requirements of safety-related embedded software SRESW are taken into account and meet the requirements of the Machinery Directive 2006/42/EC. The development process and the implementation of the programming comply with the requirements of SIL 2 acc. to DIN EN 61508-3 and DIN EN 62021 as well as PL d acc. to DIN EN ISO 13849. Besides the implementation of the software library, the entire development documentation is certified. As a result, the qSCALE RCL trueSafety module library provides the groundwork for your qSCALE Sx system for rated capacity limitation.

Reliable safety functions

At the center of the safety system is the modular cSCALE control with integrated qSCALE RCL. Safety mechanisms for error detection play an important role within the qSCALE system. All safety-relevant program and parameter data of the RCL C library are secured by checksums. As a result, data consistency is guaranteed. The entire calculation processes run redundantly, are controlled by cross-comparisons and are cyclically monitored by safety mechanisms, which are integrated in the cSCALE. The monitoring of compatibility of the safety-relevant program versions guarantees the correct interaction of the software modules.

CoDeSys module library

The CoDeSys module library is the interface between the cSCALE control program and the RCL C library. The library also contains qualified modules for the functional implementation outside of the RCL C library, including modules for analog and digital I/O, signal processing, event and file handling, parameter and data handling, data logger, CANopen and CANopen safety communication. With the help of the modular system, individual applications can be programmed quickly and easily to develop certifiable customized applications. During operation, a customer-specific data and event logger records and stores measurement data. Raw data is automatically converted into a standard Excel format and can be easily processed.

For further information please visit our website or contact our Sales Team directly for a non-binding consultation. We look forward to hearing from you!


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