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 Q L QnA Programming Manual

Mitsubishi Electric MELSEC Q L QnA manual cover

Pages 110

Year 2018

Language(s)

of 110

Programming Manual

110 pages

Programming Manual

210 pages

Mitsubishi Electric MELSEC Q L QnA Specification

The Mitsubishi Electric MELSEC Q Series, specifically the L and QnA models, are advanced programmable logic controllers (PLCs) designed for high-performance industrial automation systems. These PLCs are engineered to provide enhanced processing capabilities, robust communication options, and extensive scalability, making them suitable for a wide range of applications from small-scale systems to complex process controls.

The Q Series PLCs feature a modular design, allowing users to customize and expand their systems by adding various I/O modules, communication interfaces, and special function modules. The QnA models emphasize high-speed processing with a powerful CPU architecture that ensures faster execution of instructions and real-time data processing, which is critical for applications requiring precise control and synchronization.

Communication flexibility is another hallmark of the MELSEC Q Series, supporting multiple networking protocols such as Ethernet, CC-Link, and Modbus, enabling seamless integration with other automation equipment and enterprise systems. This capability ensures that the PLCs can operate efficiently in diverse industrial environments, enhancing overall system interoperability and data exchange.

The MELSEC Q Series also offers advanced programming capabilities via Mitsubishi's GX Developer or GX Works software, facilitating intuitive programming, debugging, and maintenance. This user-friendly interface supports ladder logic, structured text, and function block diagram languages, catering to diverse programming preferences and enhancing system customization.

Reliability and durability are integral to the Q Series design, with features like error-checking, diagnostic tools, and robust construction that ensure long-term operational stability. The combination of these technical attributes makes the Mitsubishi Electric MELSEC Q Series L and QnA models a preferred choice for industries seeking efficient, scalable, and reliable automation solutions.

Mitsubishi Electric MELSEC Q L QnA F.A.Q.

How do I perform a basic setup of a MELSEC Q Series PLC?

To perform a basic setup of a MELSEC Q Series PLC, first install the PLC in a suitable location. Connect the power supply and ensure that it matches the voltage and current specifications. Then, connect the input/output devices to the corresponding modules. Use the GX Works2 software to configure the PLC settings and download your program to the CPU module.

What steps should I follow to troubleshoot a non-responsive MELSEC Q PLC?

First, check if the PLC is powered on and that all connections are secure. Verify that the status LEDs on the CPU module indicate normal operation. If an error is indicated, use the GX Works2 software to connect to the PLC and read the error codes. Consult the manual for specific error code details and recommended actions.

How can I update the firmware of a Q Series CPU module?

To update the firmware of a Q Series CPU module, download the latest firmware from the Mitsubishi Electric website. Connect your PC to the CPU module using an appropriate communication cable. Use the GX Works2 software to access the 'Firmware Update' function and follow the on-screen instructions to complete the update process.

What is the procedure for backing up a program on a MELSEC Q PLC?

To back up a program on a MELSEC Q PLC, connect your PC to the PLC using GX Works2 software. Open the project file, and under the 'Project' menu, choose 'Export' followed by 'Save As'. This will save a copy of your program which can be stored for future use or restoration.

How do I extend the I/O capacity of a MELSEC Q Series PLC?

To extend the I/O capacity, install additional I/O modules to the existing base unit. Make sure the new modules are compatible with the existing system. After installation, configure the settings for the new I/O modules in the GX Works2 software and update your program to incorporate the new I/O points.

What maintenance practices should be performed regularly on MELSEC Q PLCs?

Regular maintenance for MELSEC Q PLCs includes checking and securing all electrical connections, cleaning the PLC and its modules to remove dust and debris, inspecting for any signs of wear or damage, and verifying that all firmware and software are up to date. Periodic testing of I/O functionality is also recommended.

How can I configure communication between a MELSEC Q PLC and an HMI?

To configure communication between a MELSEC Q PLC and an HMI, first ensure that both devices support the same communication protocol, such as Ethernet or RS-232. Configure the communication parameters, such as IP addresses and port numbers, in both the PLC and HMI. Use the HMI software to map the PLC addresses to the HMI screens.

What are the steps to diagnose and fix a communication failure between MELSEC Q PLCs and peripheral devices?

Start by checking all physical connections and ensuring that cables are intact and properly connected. Verify that the communication settings, such as baud rate and parity, match between the PLC and the peripheral devices. Use GX Works2 to check for error codes and refer to the manual for troubleshooting tips.

How do I program a MELSEC Q PLC to handle analog inputs?

To program a MELSEC Q PLC for analog inputs, first install an analog input module. In GX Works2, configure the module parameters, such as input range and data format. Write a program to read the analog values and scale them as needed for your application. Use data registers to store and manipulate these values.

What precautions should I take when replacing a MELSEC Q CPU module?

Before replacing a MELSEC Q CPU module, ensure the PLC is powered down and all power sources are disconnected. Backup the existing program and configuration data. Remove the old CPU module carefully to avoid damaging other components. Install the new module and restore the program and settings using GX Works2. Test the system thoroughly after replacement.