Journal of Applied Sciences1812-56541812-5662Asian Network for Scientific Information10.3923/jas.2014.2084.2086TangXin LiHong-Jun ChenYi-Tao TangWen-Hua 1220141418An industry parallel-control system framework for Siemens
S7-200 PLC series is researched in this study. By analysis of PLC hardware features
and operation modes, communication and information automation network, a multi-task
system framework model which can improve PLC control efficiency in the use process
and solve program chaos problem has been established. Multi-task system completes
the programming system fault tolerance function and strengthens the system robustness.]]>Liao, C.C.,20073rd Edn.,Li, H.J., Y.J. Zhao and S.M. Huang,20061968Li, H.J., Y.J. Zhao and S.M. Huang,200725758Xu, R.Z. and J.M. Ye,2001Zheng, W.M. and Z.Z. Tang,19922nd Edn.,