Equivalent Subroutines in Motion Wizard: S7-200 Smart (Step7 MicroWin) vs. S7-200 (TIA Software)

Find Motion Wizard S7-200 PLC Smart? In industrial automation, motion control plays a pivotal role in ensuring precise and efficient machine operations. Siemens’ S7-200 Smart (using Step7 Micro/WIN) and S7-200 (programmed with TIA Portal) are popular PLC systems designed for such tasks. This article delves into the equivalent subroutines (functions) in Motion Wizard between these two platforms, helping engineers transition seamlessly or choose the best fit for their projects.

Overview of Motion Control Subroutines

Both the S7-200 Smart and S7-200 platforms offer specialized subroutines or blocks for motion control. While S7-200 Smart uses pre-built subroutines like AXISx_CTRL or AXISx_MAN in Step7 Micro/WIN, TIA Portal employs standardized PLCopen Motion Control blocks such as MC_Power and MC_MoveAbsolute. These functions enable engineers to control motion axes effectively, whether for basic positioning, speed control, or advanced motion profiles.

Step-by-Step Comparison of Subroutines

Step 1: Axis Initialization

• S7-200 Smart: AXISx_CTRL
• TIA Portal: MC_Power

The AXISx_CTRL in Step7 Micro/WIN corresponds to the MC_Power block in TIA Portal. Both are used to initialize and enable the motion axis, ensuring it is ready for operation.

Step 2: Manual Jogging

• S7-200 Smart: AXISx_MAN
• TIA Portal: MC_MoveJog

AXISx_MAN allows manual jogging of the axis, providing control to move the motor in positive or negative directions at a defined speed. The equivalent in TIA Portal, MC_MoveJog, performs the same function, enabling manual movement for setup or troubleshooting.

Step 3: Velocity Mode Operation

• S7-200 Smart: AXISx_RUN
• TIA Portal: MC_MoveVelocity

The AXISx_RUN subroutine in S7-200 Smart can be likened to MC_MoveVelocity in TIA Portal. This function enables continuous motion at a fixed speed without targeting a specific position.

Step 4: Targeted Positioning

• S7-200 Smart: AXISx_GOTO
• TIA Portal:
  • MC_MoveAbsolute
  • MC_MoveRelative
  • MC_MoveHome

The AXISx_GOTO subroutine supports absolute, relative, or homing movements. In TIA Portal, this functionality is divided into three distinct blocks:

• MC_MoveAbsolute for moving to an exact position.
• MC_MoveRelative for movement by a defined offset.
• MC_MoveHome for homing the axis to a reference point.

Step 5: Command Execution via Table

• S7-200 Smart: AXISx_CACHE (or equivalent custom logic)
• TIA Portal: MC_CommandTable

In S7-200 Smart, implementing command tables often requires custom programming or leveraging the AXISx_CACHE subroutine. TIA Portal simplifies this with the MC_CommandTable block, allowing predefined commands to execute sequentially.

Step 6: Controlled Stop (Halt)

• S7-200 Smart: AXISx_DIS
• TIA Portal: MC_Halt

To stop motion safely, S7-200 Smart uses AXISx_DIS, while TIA Portal employs MC_Halt. Both ensure a controlled deceleration and halt of the axis without abrupt stops, preserving mechanical integrity.

Key Differences Between S7-200 Smart and S7-200 in TIA Portal

1. Programming Environment:
   • S7-200 Smart relies on Step7 Micro/WIN, a simpler and more traditional programming interface.
   • S7-200 with TIA Portal utilizes a modern, integrated environment with extensive motion control libraries.
2. Standardization:
   • TIA Portal supports PLCopen Motion Control standards, ensuring compatibility across various Siemens PLCs.
   • S7-200 Smart subroutines are proprietary and tailored specifically for the S7-200 Smart hardware.
3. Flexibility and Scalability:
   • TIA Portal offers advanced functions such as multi-axis synchronization and seamless integration with other Siemens devices.
   • S7-200 Smart is ideal for smaller, standalone motion control applications.

When to Choose S7-200 Smart or S7-200 (TIA Portal)?

• S7-200 Smart:
  • Best for simple motion control tasks with fewer axes.
  • Ideal for engineers familiar with Step7 Micro/WIN.
  • Suitable for cost-sensitive projects.
• S7-200 with TIA Portal:
  • Recommended for advanced motion control applications.
  • Perfect for projects requiring standardized PLCopen Motion Control.
  • Scalable for systems with multiple axes and complex requirements.

Conclusion

Understanding the equivalent subroutines between S7-200 Smart and S7-200 in TIA Portal is essential for selecting the right platform and optimizing motion control performance. While both systems provide robust solutions for motion control, TIA Portal stands out for its flexibility, scalability, and adherence to industry standards. Engineers should evaluate their specific project needs to make an informed decision.