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Safety joystick with CANopen or J1939 interface

Published 2013-04-10

Bosch Rexroth (Germany) has introduced the 4THEC5 SIL2 joystick, which is compliant to SIL2 (IEC 62061) and PLd (ISO 13849-1). The device provide a CAN interface supporting CANopen or J1939 profile specifications.

SINCE THE EUROPEAN MACHINERY DIRECTIVE 2006/42/EC has come into effect end of 2009, machine manufacturers have to comply with and therefore have to assess the risks resulting from their machinery. A measure for risk reduction is functional safety, e.g. based on the harmonized standards IEC 62061 and ISO 13849-1. The introduced joystick 4THEC5 SIL2 meets these functional safety requirements. The device is SIL2/PLd capable including handgrip functions (on/off push buttons and rockers, proportional rollers).
Machine builders who need to offer safety-related functions on their machines can incorporate this unit into their safety system. The controller manages signals from the joystick by means of one 4-pin connector. In addition, the joystick provides CANopen and J1939 support. Via these CAN-based networks, the user can connect human machine interfaces or configuration tools.

Safety standards and the Machinery Directive (read on)

To ensure reliability, the joystick incorporates contactless sensor technology. Internal product architecture features total redundancy for all data flows. For each control element, two position sensors send separate signals to two micro-controllers, which check the consistency of the information using specially developed software. This redundant architecture ensures that the signals on the bus are fully safe as defined by the applied standards. The joystick is specified for 5-million cycles.
All THE5 products comprise a control lever, a mounting body for actuation plungers and a housing containing the sensor electronics. They all have similar mechanics and ergonomics. Their main differences are the integrated electronic functions and the type of output signals. The CAN-version generates periodically messages. They are compatible with the SX14 and SX12 electrohydraulic actuation module.