Abstract
Steel pipe for pipeline have to go through multiple procedure in the whole process, and steel pipe transportation problem exists between the various processes. According to the specific requirements of the workshop environment and control tasks, a new communication mode that use S7-300PLC as the control core, connect 8 DP substation, involve 1077 output and input dot was adopted in the whole system. In the automatic mode, requirements of the complex technological process were realized; shake hands work mode was adopted between the production; using the proximity switch completed the material length measurement; in the location of inconvenience sensor installation, adopted virtual sensor in positioning. The HMI software in PC was WinCC V7.0, and communicated with PLC by Ethernet.
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