Tuesday 10 August 2010

Laboratory, drilling & power applications

CANopen profiles for laboratory automation

CAN in Automation (CiA) has released additional device interfaces for laboratory automation. The CiA 434 specifications (part 2 and part 3) describe device profiles for heating, cooling, and shaking units as well as dispensers, dilutors, and pumps. The profiles specify process data and configuration parameters. This makes the device in a CANopen network interoperable and even partly exchangeable. This simplifies system design.

The CANopen profiles for laboratory automation have been developed by market-leading companies and are designed especially for pipette automation systems, but are also suitable for other laboratory equipment. In such systems, IEC 61131-3 programmable devices are increasingly used, which are originally developed for industrial automation. The CiA 434 specification has been published CiA internally; excerpts are available for non-members.

CANopen profile for drilling machines

The CiA 455 application profile is suitable for construction machinery with drilling functions such as rotary drilling rigs. It has been designed with special regard on positioning and tool control. The CANopen profile specifies the electronic interfaces for several units including feeder, position, tool, mast, winch, material tank, and sensor control units as well as the drilling controller. Besides process data and configuration parameters, the profile recommends bit-rates, connectors, and some other physical layer parameters.

The standardized interfaces simplify the system integration and allow the use of third party units. The application profile has been published CiA-internally, but an excerpt is available also for non-members. It is the second profile for construction machines; the first was the CiA 415 profile for sensor systems of road construction machines such as pavers and compactors.

Power supplies device updated

The CiA 453 device profile for power supplies has been reviewed and updated. The new version 1.1 specifies extended CANopen communication capabilities for power supply units.

A power supply unit compliant to CiA 453 is able to switch from local to remote control mode and vice versa except in the sequential processing mode. The introduced extensions comprise configuration of the internal logical circuitry (digital inputs and outputs) and configuration of the signal delay times of the power supply units. In addition, the boot-up configuration register has been introduced. It will provide information about the power supply device state after initialization. In general, the different power supply status procedures have been harmonized. The Emergency (EMCY) message contains now also fault indicator information. The editorial changes in the new version should increase the readability.

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