Contents

SAFETY PRECAUTIONS
CONDITIONS OF USE FOR THE PRODUCT
CONTENTS
MANUALS
RELEVANT MANUALS
GENERIC TERMS
1 GENERAL DESCRIPTION
- 1.1 PID Processing Method
2 SYSTEM CONFIGURATION FOR PID CONTROL
- 2.1 Applicable CPU
3 PID CONTROL SPECIFICATIONS
- 3.1 PID Control by incomplete derivative
  - Performance specifications
  - PID operation block diagram and operation expressions
  - PID control instruction list
- 3.2 PID Control by Complete Derivative
  - Performance specifications
  - PID operation block diagram and operation expressions
  - PID control instruction list
4 FUNCTIONS OF PID CONTROL
- 4.1 Outline of PID Control
- 4.2 Functions of PID Control
  - Operation method
  - Forward operation and reverse operation
  - Proportional operation (P operation)
  - Integral operation (I operation)
  - Derivative operation (D operation)
  - PID operation
- 4.3 Other Functions
  - Bumpless changeover function
  - MV upper/lower limit control function
  - Function for transfer to the SV storage device for the PV in manual mode
  - Changing the PID control data or input/output data setting range (for QCPU and LCPU)
5 PID CONTROL PROCEDURE
- 5.1 PID Control Data
  - Number of loops to be used and the number of loops to be executed in a single scan
  - Sampling cycle
- 5.2 I/O Data
6 PID CONTROL INSTRUCTIONS
7 HOW TO READ EXPLANATIONS FOR INSTRUCTIONS
8 INCOMPLETE DERIVATIVE PID CONTROL INSTRUCTIONS AND PROGRAM EXAMPLES
- 8.1 PID Control Instructions
  - PID control data settings
  - PID operation
  - Operation stop/start of designated loop no.
  - Parameter change at designated loop
- 8.2 PID Control Program Examples
  - System configuration for program examples
  - Program example for automatic mode PID control
  - Program example for changing the PID control mode between automatic and manual
9 COMPLETE DERIVATIVE PID CONTROL INSTRUCTIONS AND PROGRAM EXAMPLES
- 9.1 PID Control Instructions
  - PID control data settings
  - PID control
  - Monitoring PID control status (QnACPU only)
  - Operation stop/start of designated loop no.
  - Parameter change at designated loop
- 9.2 PID Control Program Examples (for QCPU and LCPU)
  - System configuration for program examples
  - Program example for automatic mode PID control
  - Program example for changing the PID control mode between automatic and manual
- 9.3 PID Control Program Examples (QnACPU only)
  - System configuration for program examples
  - Program example for automatic mode PID control
  - Program example for changing the PID control mode between automatic and manual
APPENDICES
- Appendix 1 Processing Time List
- Appendix 2 Anti-Reset Windup Measure
INDEX
INSTRUCTION INDEX
REVISIONS
WARRANTY

Mitsubishi Electric MELSEC QL QnA v2 Programming Manual

Mitsubishi Electric MELSEC QL QnA manual cover

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Mitsubishi Electric MELSEC QL QnA Specification

The Mitsubishi Electric MELSEC Q Series is a sophisticated range of programmable logic controllers (PLCs) designed to meet the demanding requirements of modern industrial automation. At the heart of this series, the QL and QnA models offer advanced functionality, reliability, and scalability. These PLCs are engineered to enhance productivity and efficiency in various applications, from simple machine control to complex process automation.

The Q Series PLCs boast a modular architecture, allowing users to tailor configurations to specific needs. They support a wide array of I/O modules, including digital, analog, and communication modules, ensuring seamless integration with diverse industrial equipment. The high-speed processing capability of the Q Series allows for rapid execution of complex control algorithms, which is crucial for time-sensitive applications.

One of the standout features of the Q Series is its network compatibility, offering support for multiple industrial communication protocols such as Ethernet, CC-Link, and Modbus. This connectivity facilitates easy integration into existing network infrastructures and enhances data exchange across different systems.

The Q Series also emphasizes user-friendly programming and maintenance, featuring intuitive software tools that streamline the development and debugging processes. This user-centric design minimizes downtime and increases overall system performance. Additionally, the Q Series is designed with a focus on reliability and durability, incorporating robust hardware components that ensure long-term operation in harsh industrial environments.

Overall, the Mitsubishi Electric MELSEC QL QnA models provide a flexible, powerful solution for industrial automation, characterized by advanced processing capabilities, extensive connectivity options, and user-friendly design, all of which contribute to improved operational efficiency and reduced total cost of ownership.

Mitsubishi Electric MELSEC QL QnA F.A.Q.

How do I properly connect a MELSEC QL module to a power supply?

Ensure that the power supply voltage matches the specifications of the MELSEC QL module. Connect the power supply to the designated terminals, ensuring that the polarity is correct to avoid damage to the module.

What is the procedure for updating the firmware on a MELSEC QL CPU module?

To update the firmware, first backup all program data. Use the MELSOFT software to connect to the CPU and follow the firmware update instructions provided by Mitsubishi. Ensure that power is stable during the update process to prevent corruption.

How can I troubleshoot a communication error between MELSEC QL modules and connected devices?

Check all physical connections and cables for defects or loose connections. Verify the configuration settings in the MELSOFT software to ensure they match the intended setup. Use diagnostic tools within the software to identify specific error codes and refer to the manual for solutions.

What maintenance steps should be regularly performed on MELSEC QL modules?

Regularly inspect modules for dust accumulation and clean using compressed air. Check for secure connections and ensure that the environment meets the specified temperature and humidity conditions. Periodically check for firmware updates.

How do I configure a MELSEC QL module for data logging?

Use the MELSOFT software to set up the data logging parameters. Define the data points you wish to log, the logging intervals, and the storage location. Ensure that the storage medium has sufficient space.

What should I do if a MELSEC QL module is not powering on?

Verify that the power supply is functioning and correctly connected. Check for blown fuses or tripped circuit breakers in the power circuit. Inspect the module for any visible damage or burnt components.

Can I expand the I/O capacity of a MELSEC QL system?

Yes, MELSEC QL systems can be expanded by adding additional I/O modules. Ensure compatibility with the existing setup and update the system configuration through the MELSOFT software to recognize new modules.

How do I perform a factory reset on a MELSEC QL CPU module?

To perform a factory reset, press the reset button located on the module while turning on the power. This will reset the module to its factory settings, erasing all user configurations and data.

What are the recommended environmental conditions for operating MELSEC QL modules?

The recommended conditions include a temperature range of 0°C to 55°C and humidity levels between 10% and 90% non-condensing. Ensure that the modules are not exposed to direct sunlight or corrosive environments.

How can I ensure data integrity during a power failure in a MELSEC QL system?

Implement an uninterruptible power supply (UPS) to provide temporary power during outages. Configure the system to periodically save critical data to non-volatile memory or an external storage device.