Ask for a graduation thesis about automatic control circulation system of workbench.

Using PLC to control the automatic reciprocating cycle of the workbench. PLC is used to control the automatic reciprocating cycle of the workbench, and the workbench will be dragged by the motor through the lead screw. Control requirements: automatic cycle operation, inching control (for debugging) and single cycle operation, that is, the workbench moves back and forth once and stops at the original position. Eight-cycle counting control, that is, the workbench will move back and forth into a cycle, and automatically stop at the original position after eight cycles.

2. There are three indicators, and the control requirement is: 1. After pressing the start key, 1) the first indicator lights up 10s, and then the second indicator lights up; 2) After the second indicator lights up 10s, the third indicator lights up; 3) After the three indicator lights are on at the same time 10, they all go out; 4) Start circulating work after 4) 10 seconds. 2. Press the stop button, and all the indicator lights will go out. Try to design the control program.

3. There is an indicator light. The control requirements are: after pressing the start button, light it for 5s, turn it off for 5s, and stop working after repeating it for 5 times. Try to design ladder diagram and write instruction statement table.

4. If the control system selects three high-speed counters, namely C237, C246 and C253, assuming that their highest counting signal frequencies are 7.5 kHz, 5.5 kHz and 1.8 kHz respectively, can the system run normally? Why?

5. Draw a ladder diagram according to the instruction list or write an instruction list according to the ladder diagram.

LD X0

Master production plan

And X 1

Master production plan

And X2.

Master production plan

And X3.

Master production plan

And X4

OUT Y0

Massive parallel processing (same as massive parallel processing)