It can be seen from Table 9-1.1 that in the Siemens S7 series plc, in addition to some of the common contact symbols of almost all PLCs, there are some special symbols, as explained below.
Tubular Stranding Machine
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Take the example of the "instruction execution result less than or equal to 0" as an example, and the program is shown in Figure 9-1.4. In the figure, when IO.O=l, the operation of “MW10 - MW20†is performed, for example, MW10 - MW20 ≤ 0, then QO.O = ​​l.
Tubular rotor supported by bearing, bearing lubrication by centralized circulating oil.
Planetary cages supported by bearing or under roller, with back twist.
Lay length optional by gearbox or by electrical system.
Machine design customized.