Abstract
In the process of steel rolling production lines, as the control center, PLC is the key part of loop and even decides whether the entire set of steel rolling production line can action accurately, also it is the key part of achieving automated production line.
On account of fast finishing units and other aspects of the reasons, it is difficult for the two mill speed control system to ensure tension-free and not steel reactor. Hence, a loop control link is needed between these racks. Because Siemens S7-400 series PLC features run faster and less demand programming in the man-machine interface. And here mainly use the Siemens S7-400 series PLC to carry out the loop sets of design.
This paper presents effect of a loop control system in the steel rolling production line, the basic principles of control of loop. PLC hardware and wiring diagram finishing the first loop area of PLC control procedures.It also presents PLC’s hardware and wiring diagram, as well as the PLC control procedures of the first loop area.