How to Program Motion Control Axis with GOTO Subroutine | S7-200 Smart | Step 7 MicroWin

Programming motion control in S7-200 Smart using Step 7 MicroWin can be efficiently handled using the GOTO subroutine method. This guide provides a step-by-step tutorial on implementing motion control with precise positioning, ensuring smooth and controlled movements.

Prerequisites

Before we start, make sure you have the following:

• Siemens S7-200 Smart PLC
• Step 7 MicroWin Smart software installed on your PC
• A stepper motor or servo motor connected to the PLC
• Basic knowledge of PLC programming

Step-by-Step Guide

Step 1: Configure Hardware

1. Connect the motor driver to the output terminals of the PLC.
2. Ensure proper wiring between the power supply, motor driver, and PLC.
3. Set up the communication between your PC and the PLC using an appropriate cable.
4. Open Step 7 MicroWin Smart and create a new project.

Step 2: Define Motion Control Parameters

1. Open the Program Blocks section.
2. Create a new Data Block (DB) for storing:
   • Speed parameters
   • Acceleration settings
   • Target positions
3. Assign memory addresses to these parameters for easy reference.

Step 3: Write the GOTO Subroutine

1. Open the Subroutine Editor in Step 7 MicroWin Smart.
2. Create a new subroutine (e.g., SUB_MOTION).
3. Use the GOTO instruction to jump between motion sequences based on conditions.
4. Example ladder logic for motion control:

Step 4: Integrate GOTO Subroutine into Main Program

1. Call the SUB_MOTION subroutine from the main OB1 block.
2. Ensure proper execution sequence for smooth motion.
3. Implement interlocks and safety checks to prevent misoperation.

Step 5: Test and Debug

1. Download the program to the PLC.
2. Run the simulation or test with actual hardware.
3. Monitor and adjust speed, acceleration, and position parameters as needed.
4. Debug any errors using the PLC status monitor.

Conclusion

Using the GOTO subroutine in S7-200 Smart enables efficient motion control programming by structuring movement sequences logically. Following this step-by-step guide ensures a smooth implementation, improving the automation process with precise motion handling.