Contents

SAFETY PRECAUTIONS
CONDITIONS OF USE FOR THE PRODUCT
INTRODUCTION
CONTENTS
RELEVANT MANUALS
TERMS
CHAPTER 1 OVERVIEW
- 1.1 Features
- 1.2 PID Control Overview
- 1.3 Forward Operation and Reverse Operation
- 1.4 PID Control Details
  - 1.4.1 Proportional operation (P operation)
  - 1.4.2 Integral operation (I operation)
  - 1.4.3 Derivative operation (D operation)
  - 1.4.4 PID operation
CHAPTER 2 STRUCTURE AND COMBINATIONS OF PROCESS CONTROL INSTRUCTIONS
- 2.1 Structure of Instructions
- 2.2 How to Specify Data in Devices
  - 2.2.1 In the case of bit data
  - 2.2.2 In the case of word (16-bit) data
  - 2.2.3 In the case of double word (32-bit) data
  - 2.2.4 In the case of real number data (floating-point) data
  - 2.2.5 Operation errors
  - 2.2.6 Execution conditions
  - 2.2.7 Number of steps
  - 2.2.8 Index modification
- 2.3 Basic Loop Types Available by Combinations of Process Control Instructions
CHAPTER 3 DATA USED FOR PROCESS CONTROL INSTRUCTIONS AND HOW TO SPECIFY DATA
- 3.1 Process Control Instructions and Data Structure
- 3.2 Local Work Memory
- 3.3 Data Used for Process Control Instructions
  - 3.3.1 Loop memory
  - 3.3.2 Input data
  - 3.3.3 Block memory
  - 3.3.4 Operation constant
  - 3.3.5 Loop tag memory allocation contents
CHAPTER 4 HOW TO EXECUTE PROCESS CONTROL INSTRUCTIONS
- 4.1 Execution Cycle and Control Cycle
- 4.2 Concept of Program
  - 4.2.1 Arithmetic error of floating-point data
CHAPTER 5 EXECUTION CONDITION SWITCHING AND FUNCTIONS
- 5.1 Execution Condition Switching
  - 5.1.1 Loop RUN/STOP
- 5.2 Functions
  - 5.2.1 Tracking function
  - 5.2.2 Cascade loop tracking
  - 5.2.3 Loop selector tracking
CHAPTER 6 INSTRUCTIONS
- 6.1 How to Read the Instruction List
- 6.2 List of Instructions
  - 6.2.1 I/O control instructions
  - 6.2.2 Control operation instructions
  - 6.2.3 Compensation operation instructions
  - 6.2.4 Arithmetic operation instructions
  - 6.2.5 Comparison operation instructions
  - 6.2.6 Auto tuning instructions
CHAPTER 7 HOW TO READ INSTRUCTION DETAILS
CHAPTER 8 I/O CONTROL INSTRUCTIONS
- 8.1 S.IN
- 8.2 S.OUT1
- 8.3 S.OUT2
- 8.4 S.MOUT
- 8.5 S.DUTY
- 8.6 S.BC
- 8.7 S.PSUM
CHAPTER 9 CONTROL OPERATION INSTRUCTIONS
- 9.1 S.PID
- 9.2 S.2PID
- 9.3 S.PIDP
- 9.4 S.SPI
- 9.5 S.IPD
- 9.6 S.BPI
- 9.7 S.R
- 9.8 S.PHPL
- 9.9 S.LLAG
- 9.10 S.I
- 9.11 S.D
- 9.12 S.DED
- 9.13 S.HS
- 9.14 S.LS
- 9.15 S.MID
- 9.16 S.AVE
- 9.17 S.LIMT
- 9.18 S.VLMT1
- 9.19 S.VLMT2
- 9.20 S.ONF2
- 9.21 S.ONF3
- 9.22 S.DBND
- 9.23 S.PGS
- 9.24 S. SEL
- 9.25 S.BUMP
- 9.26 S.AMR
CHAPTER 10 COMPENSATION OPERATION INSTRUCTIONS
- 10.1 S.FG
- 10.2 S.IFG
- 10.3 S.FLT
- 10.4 S.SUM
- 10.5 S.TPC
- 10.6 S.ENG
- 10.7 S.IENG
CHAPTER 11 ARITHMETIC OPERATION INSTRUCTIONS
- 11.1 S.ADD
- 11.2 S.SUB
- 11.3 S.MUL
- 11.4 S.DIV
- 11.5 S.SQR
- 11.6 S.ABS
CHAPTER 12 COMPARISON OPERATION INSTRUCTIONS
- 12.1 S. >
- 12.2 S. <
- 12.3 S. =
- 12.4 S. >=
- 12.5 S. <=
CHAPTER 13 AUTO TUNING
- 13.1 S. AT1
CHAPTER 14 ERROR CODES
- 14.1 List of Error Codes
APPENDICES
- Appendix 1 Program Example
- Appendix 2 Loop Tag Memory List
  - Appendix 2.1 PID control (SPID), 2-degree-of-freedom PID control (S2PID), sample PI control (SSPI)
  - Appendix 2.2 I-PD control (SIPD), blend PI control (SBPI)
  - Appendix 2.3 Manual output (SMOUT), monitor (SMON)
  - Appendix 2.4 Manual output with monitor (SMWM), PIDP control (SPIDP)
  - Appendix 2.5 2 position ON/OFF control (SONF2), 3 position ON/OFF control (SONF3)
  - Appendix 2.6 Batch counter (SBC)
  - Appendix 2.7 Ratio control (SR)
- Appendix 3 Operation Processing Time
  - Appendix 3.1 Operation processing time of each instruction
  - Appendix 3.2 Operation processing time of 2-degree-of-freedom PID control loop
INDEX
INSTRUCTION INDEX
REVISIONS
WARRANTY

Mitsubishi Electric MELSEC Q Structured Programming Manual

Mitsubishi Electric MELSEC Q Structured manual cover

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Mitsubishi Electric MELSEC Q Structured Specification

The Mitsubishi Electric MELSEC Q Series is a high-performance programmable logic controller (PLC) designed for advanced automation systems. It offers a comprehensive solution for various industrial applications, emphasizing speed, precision, and flexibility. The Q Series PLC employs a modular architecture, allowing users to customize their system configurations by integrating different modules, such as CPUs, power supplies, input/output units, and communication modules. This modularity enables seamless scalability and adaptability to diverse operational requirements.

Central to the MELSEC Q Series is its high-speed processing capability, boasting a basic instruction execution time of just 34 nanoseconds. This performance is complemented by a large program memory capacity, supporting complex control programs and extensive data processing tasks. The system supports multiple programming languages, including ladder logic, structured text, and function block diagrams, adhering to the IEC 61131-3 standard to enhance programming flexibility and ease of use.

The Q Series provides robust network connectivity options, including Ethernet, CC-Link, and other fieldbus protocols, facilitating efficient communication within industrial networks. These communications capabilities support real-time data exchange and integration with other automation systems, enabling comprehensive control and monitoring across the enterprise.

Safety and reliability are prioritized in the design of the Q Series. It features advanced diagnostic functions and error-checking mechanisms to ensure system integrity and minimize downtime. Additionally, it supports redundant configurations for critical applications, enhancing operational stability and reliability.

Overall, the Mitsubishi Electric MELSEC Q Series PLC is engineered for high performance, offering users a versatile and reliable platform for sophisticated automation solutions. Its modular design, coupled with powerful processing capabilities and extensive connectivity options, makes it an ideal choice for industries seeking to optimize their control systems.

Mitsubishi Electric MELSEC Q Structured F.A.Q.

How do I initiate a program upload in the MELSEC Q series PLC?

To upload a program in the MELSEC Q series PLC, connect your programming device to the PLC using the appropriate communication cable. Open the GX Developer or GX Works software, select 'Online', and then 'Read from PLC'. Choose the program elements you want to upload, and confirm to start the process.

What are the steps to troubleshoot a communication error between MELSEC Q PLC and a connected device?

First, verify that all cable connections are secure. Check the communication settings in both the PLC and the connected device to ensure they match (baud rate, parity, etc.). Use diagnostic tools within GX Developer or GX Works to identify any specific error codes. Refer to the error code documentation for detailed troubleshooting steps.

How can I perform a firmware update on the MELSEC Q series PLC?

To perform a firmware update, first download the latest firmware version from the Mitsubishi Electric website. Connect your PC to the PLC, open the firmware update tool, and follow the on-screen instructions to upload the new firmware to the PLC. Ensure that the PLC is not powered down during the update process.

What maintenance procedures are recommended for the MELSEC Q series PLC to ensure optimal performance?

Regularly inspect the PLC for dust and debris, and clean if necessary using a dry cloth. Check all connections, including power supply and communication lines, for signs of wear or damage. Perform periodic backups of the PLC programs and configuration settings. Additionally, verify the operation of cooling fans and replace them if they are not functioning properly.

How can I configure the MELSEC Q series PLC for remote monitoring?

To configure remote monitoring, ensure the PLC is connected to a network. Use the GX Works software to configure the network settings, including IP address, subnet mask, and gateway. Set up a VPN or use a secure Ethernet protocol for remote access. Then, configure the monitoring software to connect to the PLC's IP address for data acquisition and monitoring.

What should I do if the MELSEC Q series PLC fails to start after a power outage?

Check the power supply to ensure it is providing the correct voltage. Inspect the PLC and connected devices for any visible damage. Verify if the PLC is in STOP mode and switch it to RUN mode. Restore the program if necessary from a backup. If the issue persists, consult the hardware diagnostics in the GX Developer or GX Works software for further analysis.

How do I back up the program and settings of a MELSEC Q series PLC?

Connect your programming device to the PLC, open the GX Developer or GX Works software, and select 'Online' followed by 'Read from PLC'. Select all necessary program components and settings you wish to back up. Once selected, save the data to your local or network storage as a project file for future restoration.

Can I use the MELSEC Q series PLC with third-party HMIs?

Yes, the MELSEC Q series PLC can be used with third-party HMIs. Ensure that the HMI supports the communication protocol used by the PLC, such as Ethernet/IP or Modbus. Configure both the PLC and the HMI with matching communication settings, and create tags in the HMI to correspond with the PLC's memory addresses.

What are the common causes of overheating in the MELSEC Q series PLC and how can I prevent it?

Common causes of overheating include poor ventilation, high ambient temperature, and failing cooling components. To prevent overheating, ensure there is adequate airflow around the PLC, maintain a clean environment, and regularly check and replace cooling fans. Consider installing additional cooling solutions if operating in high-temperature environments.

How do I reset the MELSEC Q series PLC to factory settings?

To reset the PLC to factory settings, turn off the power supply. Then, locate the reset switch on the CPU module and hold it down while turning the power back on. Release the switch after a few seconds. This process will erase all user programs and restore the default settings. Ensure you have backed up any important data before performing a reset.