PLC multi-step machine tool control ladder diagram

The design of the PLC control ladder diagram for multi-step machine tools can be completed based on the system's working process,
control requirements and the 1/0 wiring diagram of the PLC,
as shown in the figure. What is shown in the figure is the ladder diagram design from one to four working steps.
The analysis method of each subsequent working step is the same as that of the first working step.
    The instructions are as follows:
    1) The first step: press QA when starting, connect 1000, connect 3001 and self-protect,
connect 2001 and 2002 one after another, and move quickly. Fast forward ends pressing XKl, 1001 is connected,
3002 is connected and self-protected, 2002 is disconnected, 2001 continues to be connected, and it turns to work. After the work is completed,
XK2 is pressed, 1002 is connected, and 3003 and 5000 are connected. Disconnect 2001, the work stops, after
the Is delay, 3004 is connected and self-protected, 3002 is disconnected, thereby disconnecting 2001, 2003,
2002 are connected one after another, and enter fast rewind.
    2) Second step: After the first step of rewinding is completed, press XK3, 1003 is connected,
3005 is connected and self-protected, and 3004 is disconnected. Thus, 2003 and 2002 are disconnected one after another, the rewind
stops, and 2005 is connected at the same time. Longitudinal movement and transfer to the second step. When the longitudinal advance is over, press
XK4, 1004 is connected, 3006 is connected and self-protected, 3005 is disconnected, so that 2005
is disconnected, the longitudinal advance stops, and at the same time, 2001 and 2002 are connected one after another, fast forward action, turn Enter the i-th
work step.
    3) The analysis method of the action waste of each subsequent work step is the same as that of the first work step. When
the last action of the seventh step (i.e. fast rewind) ends, XK3 is pressed, 1003 is
turned on, 3105 is turned on, 3104 is turned off, and 2003 and 2002 are disconnected one after another, and the fast rewind is stopped, completing
a Cyclic action.
    (4) Conclusion Machine tool control is one of the main application areas of PLC. This example introduces
the multi-step machine tool used for spindle leg processing. When using traditional relay control, its control circuits
have hundreds of wires, including 28 relays and 57 diodes. After switching to PLC control , the entire
control circuit (I/ There are only 14 O-wire wiring), and all relays (27
intermediate relays and 1 time relay) are omitted. It is not only very convenient to install, but also ensures
reliability and reduces the amount of maintenance. Its economic benefits are very obvious, and it also It shows that PLC
has great potential in the technological transformation of traditional equipment.