Discussion and design of communication reliability based on S7-200 PLC's free communication model
Yong Wang · Journal of Zhengzhou Institute of Light Industry · 2002
In order to solve some possible existing problems of receiving datum in free communication model,the methods of setting static line timer and static line receiver and using the engineering CRC verification have been expounded.The communication program which uses the given method has the characteristics of high reliability and less latent faults,and it could guarantee the high quality data communication.The realistic engineering application illustrated that the using of this method can also reduce the cost of hardware and avoid the lost of hardware resource.