Study Of Cold Rolled Section Steel's Force Parameter Testing System

In the previous process of cold rolled section steel force parameters'testing, when we have to complete sensors output signal acquisition and monitoring which mainly involves force signal, torque signal and rotate speed signal, the test system will have weak anti-interference performance and poor reliability because of more sensors installed in the cold rolled section steel unit, heavy arrangement of wires and weak output signal.In order to improve practical problems above, Controller Area Network (CAN) which was known as the most promising field bus was adopted to construct a measurement and control system aimed at cold forming steel's force parameters to realize sensors' play and plug in CAN network. It not only reduced the workload of wires arrangement, but also lowered the system's error, which made the system's overall performance improved.In this paper, CAN bus was applied in the study of cold forming steel's force parameter testing system. Through the analysis of physical layer, data link layer and application layer protocol in CAN bus, with the combination of virtual instruments' advantage, accomplished tasks were as follows:In the first place, embedded sensors\CAN intelligent interface was developed according to analog signal output from sensors, making each sensor be a node articulated in CAN bus. In the whole system, this CAN intelligent interface played the role of data acquisition and data transmission, which overcame shortcomings like complexity of data transmission lines, instability of communication and so on. Secondly, to achieve communication between CAN bus network node and upper PC, CAN-RS232 network bridge interface was designed in CAN bus as the communication bridge to complete CAN data's conversion to serial data. Finally, upper PC used virtual instruments integrated development environment (IDE) Lab VIEW to save and display the acquisition data.The core of system's hardware design lies in the adoption of one System on Chip (SOC), with analogy digital conversion, CAN controller and UARTO serial port integrated in it. These rich resources on chip improved the design integration of CAN network node, and also reduced its size and cut its costs, bringing tremendous convenience to sensor's play and plug into CAN network system. On the other hand, software design of system was structured in C programming language with modular programming idea, and the code was developed, compiled and debugged in Silicon Laboratories IDE, and thereafter, it was downloaded to target hardware through JTAG which was defined as a in system programmable debugging interface. The system has stable and reliable hardware and software design, accomplishing real-time monitoring to cold rolled section steel force parameters.