Giving 32 bits about multifunction control

  • 19-Jun-2008 08:01 EDT

The BODAS RC36-20 controller from Bosch Rexroth manages multifunction mobile equipment via 32-bit digital technology that it says expands hydraulics systems functionality, leads to reduced energy consumption, and provides a more efficient, flexible control platform.

Bosch Rexroth says its new 32-bit BODAS RC36-20 provides a central electronic control unit platform for efficient electrohydraulic system solutions, allowing OEMs and operators to expand mobile equipment functions and reduce energy consumption—thereby reducing costs. Also, the system’s rugged compact, design allows it to easily replace multiple 16-bit controllers or smaller PLC systems, freeing up valuable installation space and reducing wiring. The unit, a 32-bit device with a surface area less than half a sheet of letter-sized paper, was developed from Bosch’s extensive testing and experience in the automotive sector.

With 125 input and output channels as well as four CAN bus interfaces, the RC36-20 ECU offers a flexible platform for deploying new mobile applications, including "shift-on-fly" gear shifting, electrohydraulic flow matching for operating functions, or the hydrostatic regenerative brake system from Rexroth.

The controller’s TriCore technology includes 150-MHz clock timing and parallel processing to run highly complex control circuits and mathematical floating-point operations. Those abilities provide for the performance needed for demanding applications such as load torque limiting in crane applications, while simultaneously performing all other necessary functions for the working and drive hydraulics.

Resistant to the demanding conditions of the mobile work environment, the unit is rated for IP65 protection against water spraydown/penetration, shock, vibration, moisture, salt spray, and electromagnetic radiation.

Rexroth says that high reliability and system availability are ensured through short-circuit and reverse polarity-protected inputs and outputs. The RC36-20 also supports intelligent Rexroth sensors such as the DSM1-10 speed sensor with integrated diagnostic functions to help improve system vehicle availability. The proportional outputs are temperature and voltage compensated, enabling sensitive and precise control of electrically actuated valves, pumps, and motors.

The RC36-20 builds on Rexroth’s BODAS software functionality, such as the Microsoft Windows-based tools BODAS-design and BODAS-service. BODAS-design provides software developers with a fast introduction to graphic or text-based programming of the Rexroth controllers according to IEC 6-1131 standards. Comprehensive and complex applications can be developed and implemented with BODAS-design.

The graphical user interface of BODAS-service makes system parameterization, diagnostics, and maintenance easier and more efficient, speeding mobile equipment startup and maximizing uptime. With its Flash module, BODAS-service transfers programs to the BODAS RC36-20. Communication is via the KWP 2000 (Key Word Protocol) standard.

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