Paper machine is in the production of paper cone machine, paper machine type also is varied, the most common type of paper machine is spiral paper cone machineroll paper cone machine peace. To introduce the following paper cone machine proper operation:
  In relay control circuit, when power on, the circuit all relay is limited by the state, that is, the absorption of relay and at the same time, some restrictions shouldn't suck or relay not suck, this way of working is called parallel way to work. And the PLC user program is executed according to certain order cycle, so all soft relay in cycle scan connected, is conditioned by the same conditions of each relay action sequence is determined by the application of scanning sequence, this way of working is called a serial works.
  Electrical control system control logic USES the hardware connection, use of relay contacts in series or parallel machinery, such as the control logic. And PLC adopted computer technology, its control logic is adopted for the program stored in memory, to change the control logic need to change the program, so it is easy to change or increase the system function.
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