iCAN series of functional modules and the load moment limit system

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1 Introduction Fieldbus Technology is used Field Instruments And control systems of all scattered, all-digital, intelligent, two-way, 100 joint, multi-variable, multi-point, multi-point serial communication system. CAN-bUS bus is the most widely used international fieldbus one. Internal CAN-bus bus widely used, but most of the CAN-bus-bus applications still in the foundation stage, did not really play CAN-bus-bus real-time, reliable advantages, mainly reflected in the application layer protocol option. Currently dominate the market of two application layer protocols are DeviceNet and CANopen protocol agreement. But these norms complex, difficult to understand and develop the user in the early stages of development need a lot of money and manpower, not for simple control network based on CAN bus. Therefore it is necessary to develop a simple and reliable high-level CAN protocol, in order to apply a simple CAN bus applications, thus was born iCAN system and iCAN protocol specification.






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2 iCAN system and iCAN Protocol Specification
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2.1iCAN system ICAN system-wide known as the "industrial field bus CAN-bus control system (IndustryCAN-busFieldbusControlSystem)", is based on CAN-bus field bus control system. iCAN system provides a low-cost communications link, the main applications used to implement the CAN-bus communication control and data acquisition. iCAN system has built a flexible, simple structure, the advantages of lower cost, thanks to CAN-bus bus, iCAN system also has good reliability and stability. At the same time, also has easy configuration, installation, operation and maintenance simplicity. It uses CAN-bus-bus industrial field devices (such as Sensor , Meters, etc.) and management of equipment (PC, IPC , PLC, etc.) connected into a network without the need for expensive connection lines. iCAN system consists iCAN agreement, iCAN series of function modules and the PC-CAN interface card form.








2.2iCAN agreement ICAN Agreement all as "IndustryCAN-busApplicationProtocol", field bus CAN-bus is the latest one application layer protocol, with understanding of simple, easy to implement, real-time reliable. It is used with CANopen, DeviceNet protocol connection management basically the same way, remove the more complex handshake management, resource allocation, and use pre-defined combinations of management data bus CAN-bus nodes. It is the essence of lessons DeviceNet and CANopen protocol based on the development of a fully inherited object-based connectivity and addressing two core functions. Support multiple transmission, including polling, state trigger, and timed cycle approach, also based on the actual situation, removed the object-based models such as the complex, other factors limit communication baud rate, an efficient scouring the agreement, to ensure data communication reliability, real-time, effectively reducing the cost of hardware. iCAN license agreement to support industrial customers free use and development of products based on iCAN agreement does not require the agreement to pay additional fees.








3 iCAN Series Functional Block 3.1 Module Type Description Table 1 iCAN function module type table. iCAN function modules with integrated CAN-bus communication interface and iCAN application layer protocol to provide DI, DO, AI, AO, RTD, TC, counter, frequency meter and other data collection function, between the host PC and on-site equipment to provide complete Signal acquisition and communication. 3.2 The internal structure of the module (in iCAN-4050 module for example)








ICAN-4050 Functional Block Diagram shown in Figure 1, is a microprocessor, power supply, CAN communication interface, set the switch and the input / output processing circuit.