The Siemens PLC is used to control the control strategy of the Yamaha robot, and the command word is set using the external IO port to make the PLC communicate with the robot and instruct the robot to complete the corresponding action.
Siemens S7-300PLC is a widely used large and medium-sized PLC in China, and the discussion of its control strategy with peripheral robots has important implications for the installation of automation. In this paper, on the basis of the research and production of the lithium battery assembly line, the communication and control between Siemens S7300PLC and Yamaha robots are completed, and the development of two key processes in the lithium battery installation process is completed.
1 Overall hardware design
Siemens S7-300PLC and YAMAHA robot controller connected to the need to connect the start signal, emergency stop signal, fault signal and reset signal of the robot, through the connection of these four groups of signals and PLC can reach the basic requirements of the control robot. PLC is connected with the robot, and the PLC is generally used as the sending instruction party, and the robot is used as the receiving instruction party. In order to reach the intention that PLC controls the robot to walk to each point, the IO signal communication of PLC and robot needs to be established.
Combined with the process of putting steel bar and stacking stamping process in the lithium battery installation process, the walking point of the robot will not exceed 16 points, and the point of counting by 8421 is known, and the connection point of the robot and the PLC is 4 points. The PNP specification robot is connected to Siemens, and the signal connection includes two parts: one part is the start, emergency stop, fault and reset signal; One part is the 4-point communication line between the PLC and the robot; A total of 8 sets of signals.
2. Overall software design
The software control strategy is the method of robot inquiry, PLC instruction to implement the entire control. Take the stacked stomping robot as an example, the robot sends a signal 1001 inquiry after returning to the position, the robot instructs the robot to go to the intention position according to the process requirement after getting the signal, the intention position signal is (0001-1011) a total of 9 points, the point robot moves in place, announces the signal to inform the robot in place after being in place together, the robot controls other peripherals (cylinder, motor, etc.) action, and the robot is notified to return after the action is finished, and the robot continues to wait for the position instruction after the robot returns. An action cycle completes.
After the communication and control of the Siemens S7-300PLC and Yamaha robots, the development of two key processes in the lithium battery installation process was completed. PLC and robot through the method of signal transmission to complete the linkage applied to the battery installation category, has a good demonstration effect; It can be applied to other battery installation processes, and other reference to the control methods and control strategies of PLC and robots, which can complete most of the functions of PLC control robots to points, and have a good promotion effect.
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