Sensors & Transducers e-Digest, Vol. 67, Issue 5, May 2006: Standardization
(ISSN 1726- 5479)
CAN Specification Update
The CAN in Automation (CiA) organization has released the CANopen multi-level networking specification (CiA 400) and the CANopen application profile for road construction machine sensor systems (CiA 415). The documents are available for CiA-members. The CiA-400 specification supports the design of CANopen-based systems that use multi-level networks. It is possible to describe systems made by up to 127 CANopen networks. Each network may comprise up to 127 CANopen devices. The CiA-400 gateway is able to support up to 32 CANopen interfaces. It is possible to forward Service Data Objects (SDO) as well as Emergency messages. The NMT requests and the Heartbeat information are forwarded through the entire system by remote SDO. Process Data Objects (PDO) are limited to the local networks and are not forwarded. However, it is possible to map system variables into the local PDOs and handshake them to the next network level.
The CiA-415 application profile for road construction machines describes the objects for sensors and sensor controllers. This includes sensors for different temperature and position measurements. This second version of the profile has been entirely reviewed and is not compatible to the previous version.
CiA started new standardization activities. The CANopen Special Interest Group (SIG) crane/spreader is going to define an interface specification based on CANopen to interconnect crane control systems to spreaders. Andy Lewis from Bromma in Sweden chairs the SIG. The SIG plans to provide a stable work draft specification by the end of 2006. CiA is hoping to present first results at the Bauma exhibition in Shanghai in November.
CiA calls for RFID experts who like to develop a CANopen device profile for RFID reader devices. Several CANopen-based control systems require RFID information, for example in laboratory automation, storage systems, production lines, etc. The first RFID reader with CANopen connectivity is already on the market: RM Michaelidis has developed a device that is used with forklift applications.
CAN in Automation
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