Text from page 11 of catalogue Control systems for mobile vehicles
Page 11 of catalogue Control systems for mobile vehicles of ifm Electronic GmbHNotes and explanations
networking WAN, Internet TCP/IP visualisation LAN, H1, Ethernet, Profinet
The CAN bus is used to read, write and process sensor and actuator signals.
The CAN communication services Irrespective of the network configuration the transmission of the messages always takes place between a sending node (producer) and a receiving node (consumer). With CAN data transmission no addresses are assigned to the individual participants. Instead, each message to be transmitted (e.g. oil temperature, rotational engine speed) is given a clear identification mark (identifier) which is valid in the whole network. This identifier also defines the priority of the message. This ensures that even in the case of simultaneous access by several participants the more important message is transmitted first. In contrast to other bus systems the messages are not assigned a target address but an identification mark (identifier). The message can be clearly identified by means of this identifier. CAN is therefore not a participant-oriented protocol but a message-oriented protocol.
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Interbus, DeviceNet, Modbus, Profibus, CAN
Sensors for mobile applications
Diagnosis and service
CAN – The fieldbus for mobile Machines The basics At the beginning of the 1980s a bus system was developed in co-operation with some automotive manufacturers, which preferably was to be used for engine management. About 20 years later this bus system – CAN (Controller Area Network) – has become the standard in modern vehicles and mobile machines and installations. When several machine parts (e.g. engine, drive and operating function) are networked to form a whole system, CAN provides decisive advantages. Also, when the CAN bus was developed, the special operating conditions had already been taken into account. Therefore ifm electronic also uses this safe and reliable bus system for the ecomatmobile control system. The “Controller Area Network” (CAN) is defined in the international standard ISO 11898. It is based on the Producer / Consumer Network Model. It allows data to be very efficiently distributed to the other network participants by means of the broadcast method. At the same time the Producer / Consumer Model also allows communication according to the master / slave or peer-to-peer principles. These different principles are used depending on the type of mobile machine and its special design.
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Especially when several machine parts are interconnected CAN offers decisive advantages.