The plc ladder diagram is composed of many steps. In the manual conversion process of the ladder diagram, the principle of top-down and left-to-right is followed, and the conversion is performed step by step. Therefore, the PLC ladder diagram is essentially a directed graph. During the drawing process, the ladder diagram shows the rows and columns of each component through the ladder diagram. The conversion process of the ladder diagram is based on the row and column coordinates of the component, and the PLC ladder diagram is first converted into a binary tree, and then the corresponding instruction is identified according to the binary tree. A ladder diagram can be seen as a series or parallel connection between contacts or circuit blocks. The circuit block is essentially composed of two or more contacts. Therefore, it is essentially the series and parallel connection of the contacts. The series is indicated by the "" sign and used in parallel. +" indicates. As shown in Figure 1.
Valve accessories include:
1, actuator: pneumatic actuator, electric actuator, hydraulic actuator, gas-liquid actuator, electro-hydraulic actuator, manual actuator.
2, positioner and accessories: pneumatic valve positioner, electrical valve positioner, intelligent valve positioner, electro-hydraulic servo
Servo amplifier, electrical converter, filter pressure reducing valve, valve position transmitter, position retaining valve, solenoid valve, limit switch, pneumatic amplifier, intelligent module, electro-hydraulic servo, servo amplifier, alarm, explosion-proof coil, fast exhaust valve.
3,
Test equipment and other valve accessories: valve testing machine, handle, handwheel, worm wheel, valve body, spool, stem
Valve cover, valve muffler, signal generator, blank, mold, bolt nut, clamp, spring,
Diaphragm, packing, coil, O-ring, flow juice, PTFE products, gaskets, flanges, elbows, quick joints, expansion device, flow meter
Filters, non-standard ruggedities, machine tools
Marking machine.
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