运动控制系统光纤通信数据传输差错控制策略

Control Strategy for Data Transmission Error of Optical Fiber Communication in Motion Control System

光纤通信具有速度高、抗电磁干扰等优点,但是在运动控制系统模块之间应用光纤通信时,误码与意外传输延迟会影响控制系统的可靠性和稳定性。针对此问题,根据运动控制数据的特点,提出了选择性重传策略与冗余数据帧传输策略,制订了当连续检测到两个错误帧或者超过最大允许时延没有接收到数据帧时立即停机的应急措施,并给出了基于增广矩阵求解该最大允许时延的计算方法。耐久性试验表明所提出的策略与方法正确有效,能够保证系统长期稳定可靠地运行。

Optical fiber communication features high speed and good anti-electromagnetic interference capability, but when optical fiber is used in communication between modules of motion control system, bit errors and unanticipated transmission delays may affect the reliability and stability of the control system. Aiming at this problem, in accordance with the characteristics of the data in motion control, selective retransmission strategy and redundant data frame transmission strategy are proposed;and the emergency response measures are drawn up, i. e. , when two error frames have been detected, or no data frame is received after maximum allowable delay is exceeded, the system will shut down immediately;and the calculation method based on augmented matrix for solving the maximum allowable delay is given. The durability test shows that the strategies proposed are correct and effective, long term and stable operation of the system can be guaranteed.