COMPACT-plc-Mitsubishi

ABOUT MITSUBISHI CORPORATION

Mitsubishi Corporation is a well-established company that has a significant role in the fields of international trade, resource development, and investment. The Mitsubishi Group was founded in 1870 and is a conglomerate. Key milestones include:

  • Mitsubishi Electric: Founded in 1921.

  • Mitsubishi Corporation (current iteration): Established in 1950.

Founder: Yataro Iwasaki (1835-1855).

COMPACT PLC: MITSUBISHI MELSEC SERIES

Mitsubishi Electric provides a range of compact Programmable Logic Controllers (PLCs) under the MELSEC series, specifically highlighting the FX5U and FX3U models. These models are popular for small to mid-scale automation applications due to their reliability, versatility, and ability to integrate easily into various industrial environments.

FX5U Model

  • Cost-Effectiveness: Offers a budget-friendly solution without sacrificing performance.

  • Functionality: Designed for small to medium machines.

  • Features: Provides access to real-time data and enhances machine accuracy and throughput, essential for maximizing profitability in manufacturing environments.

  • Specifications: Compact size, integrated functions, expandable, and high connectivity options.

FX5UC Model

  • Ultra-Compact Design: This model is smaller than the FX5U and is suitable for applications where space is at a premium.

  • Key Features: Advanced connectivity options while also maintaining high functionality and performance.

FX3U Model

  • Performance: Known for its compact design yet high performance, making it ideal for various applications including material handling, assembly lines, and packaging machinery.

  • I/O Capacity: Features a large capacity for input/output connections to manage a wide array of field devices such as sensors and actuators.

  • Highlights: Cost-effective, flexible I/O capabilities, and high-speed processing.

GX Works3 Programming Software

Mitsubishi Electric's latest programming and maintenance software is called GX Works3. It is specifically tailored for the MELSEC iQ-R and MELSEC iQ-F Series control systems. This software package includes the earlier versions GX Works2 and GX Developer, covering the full lineup of MELSEC controllers.

Addressing Scheme in GX Works3

Mitsubishi PLCs use a specific addressing method for inputs, outputs, and relays:

Input Addressing

  • Symbol: I

  • Description: Represents the input image register where each bit corresponds to a digital input point.

  • Format: I[module number].[bit number] (e.g., I0.0).

Output Addressing

  • Symbol: Q

  • Description: Represents the output image register for digital output points.

  • Format: Q[module number].[bit number] (e.g., Q0.0).

Relay Addressing

  • Symbol: M

  • Description: Represents internal memory bits for flags, counters, and other internal variables.

  • Format: M[bit number] (e.g., M10).

Example Ladder Diagram

Scenario Description

In one scenario for a motor control system:

  • Start Button: Activates the motor.

  • Stop Button: Deactivates the motor.

Ladder Program Example

|-----[I0.0]-----| 
|  
|-----[M10]-----| 
|  
|-----[Q0.0]-----| 
|  
|-----[I0.1]------| 
|  
|-----[M10]-----| 
|  
|-----[Q0.0]-----|

Ladder Program Explanation

  • Inputs: I0.0 (start button), I0.1 (stop button).

  • Internal Relay: M10 as a latching relay to keep the motor in its current state.

  • Output: Q0.0 controls the motor’s operation.

CONCLUSION

Mitsubishi Corporation's role in technology through compact PLCs and powerful programming software like GX Works3 makes it a key player in industrial automation solutions.