Mitsubishi Electric MELSEQ FX3S Series - User Manual

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FX3S SERIES PROGRAMMABLE CONTROLLERS

USER'S MANUAL

Hardware Edition

Main Unit

AC Power Type

FX3S-MR/ES

FX3S-MT/ES

FX3S-MT/ESS

FX3S-30MR/ES-2AD

FX3S-30MT/ES-2AD

FX3S-30MT/ESS-2AD

DC Power Type

FX3S-MR/DS

FX3S-MT/DS

FX3S-MT/DSS

Display Module

FX3S-5DM

Memory Cassette

FX3G-EEPROM-32L

Main Page

Safety Precautions7
- Table of Contents9
Standards16
- Certification of UL, Cul Standards16
- Compliance with EC Directive (CE Marking)16
1 Introduction19
- Introduction of Manuals19
- Generic Names and Abbreviations Used in Manuals24
2 Features and Part Names25
- Major Features25
- Names and Functions of Parts27
  - Front Panel27
  - Sides29
3 Introduction of Products30
- List of Products and Interpretation of Model Names30
- Connector Types and Cables for Program Communication33
4 Specifications, External Dimensions and Terminal Layout (Main Units)35
- Generic Specifications35
  - Dielectric Withstand Voltage Test and Insulation Resistance Test36
- Power Supply Specifications36
  - AC Power Type36
  - DC Power Type36
- Input Specifications37
  - DC Input (Sink/Source)37
- Output Specifications38
  - Relay Output Specifications38
  - Transistor Output Specifications39
- Performance Specifications40
- External Dimensions (Weight/Accessories/Installation)42
  - Main Units42
- Terminal Layout43
5 Version Information and Peripheral Equipment Connectability46
- Version Information46
- Programming Tool Applicability47
- Use of (Built-In USB) Programming Port51
  - Installation of USB Driver51
  - Setting in GX Works251
- Cautions on Using FA Transparent Function in GOT1000 Series52
- Cautions on Using Transparent Port (2-Port) Function of GOT-F900 Series53
- Other Peripheral Equipment Applicability54
6 Examination of System Configuration55
- Configuration of a Whole System55
  - Expansion Board/Connector Conversion Adapter/Memory Cassette System Configuration55
  - Special Adapter System Configuration56
7 Installation in Enclosure57
- Installation Location59
  - Installation Location in Enclosure59
  - Space in Enclosure59
- Examination for Installing Method in Enclosure60
- Procedures for Installing on and Detaching from DIN Rail60
- Procedures for Installing Directly (with M4 Screws)63
- Connecting Methods for Main Unit and Extension Devices64
- Application of Labels68
8 Preparation for Wiring and Power Supply Wiring Procedures70
- Preparation for Wiring72
  - Wiring Procedures72
- Cable Connecting Procedures73
- Grounding77
- Examples of External Wiring [AC Power Type]78
- Examples of External Wiring [DC Power Type]79
9 Input Wiring Procedures80
- Before Starting Input Wiring82
  - Sink and Source Input82
- DC Input (Sink and Source Input Type)83
- Input Interruption (I00 to I50)88
- Pulse Catch (M8170 to M8175)90
10 Use of High-Speed Counters92
- Outline92
- Types of Counting and Operations92
- List of Device Numbers and Functions93
- Allocation of Device Numbers to Input Numbers94
  - Allocation Table94
  - Restriction of Redundant Use of Input Numbers94
- Handling of High-Speed Counters95
- Timing of Updating of Current Value and Comparison of Current Value98
  - Timing of Updating of Current Value98
  - Comparison of Current Value98
- Response Frequency and Overall Frequency99
- Examples of External Wiring (Rotary Encoder)100
  - 1-Phase 1-Input [C235 to C245]100
  - 2-Phase 2-Input [C251 to C255]101
- Related Devices and Function Switching Procedures102
  - Related Devices102
  - Function Switching] Switching of Allocation and Functions of Input Terminals103
- Cautions on Use103
11 Use of Built-In Analog104
- Outline105
- Built-In Variable Analog Potentiometer Function105
- Built-In Analog Input Function107
12 Output Wiring Procedures114
- External Wiring for Relay Output Type116
- External Wiring of Transistor Output (Sink/Source) Type119
13 Examples of Wiring for Various Uses124
- Notes about Examples of Wiring125
- Digital Switch [DSW Instruction (FNC 72)/BIN Instruction (FNC 19)]126
  - When DSW Instruction (FNC 72) Is Used126
  - When bin Instruction (FNC 19) Is Used127
- Input Matrix [MTR Instruction (FNC 52)]128
- Seven Segment with Latch [SEGL Instruction (FNC 74)/BCD Instruction (FNC 18)]129
  - When SEGL Instruction (FNC 74) Is Used129
  - When BCD Instruction (FNC 18) Is Used130
14 Test Operation, Adjustment, Maintenance and Troubleshooting131
- Preparation for Test Operation132
- Running and Stopping Procedures [Power ON]134
  - Methods of Running and Stopping134
  - Use of Several Running/Stopping Methods135
- Operation and Test [Power on and PLC Running]136
- Maintenance and Periodic Inspection137
  - Periodic Inspection137
  - Maintenance - Product Life of Relay Contacts137
- Troubleshooting with Leds138
  - POW LED [On/Flashing/Off]138
  - ERR LED [On/Flashing/Off]138
- Judgment by Error Codes and Representation of Error Codes139
- Troubleshooting146
15 Other Extension Devices and Optional Units (External Dimensions and Terminal Arrangement)148
- Special Adapters148
- Expansion Board152
- Connector Conversion Adapter157
  - Fx 3S -Cnv-Adp157
- Interface Module157
  - Fx-232Awc-H157
16 Display Module (FX 3S -5DM)158
- Specifications158
- Installation and Removal159
  - (When the Expansion Board/Connector Conversion Adapter Is Not Used Together)159
  - (When the Expansion Board/Connector Conversion Adapter Is Used Together)160
- Summary of Functions161
- Flowing of the Screen Display162
- Monitor/Test163
- Time Display and Setting172
- Error Display172
- 5DM Control Functions (Restrictions from PLC)173
  - System Information List173
  - System Information Setting Program Example174
- Specified Device Monitor Function174
- Back Light off Function180
  - System Information - Back Light off Function180
- Display Screen Protect Function181
  - System Information - Display Screen Protect Function181
  - Program Example (Screen Protect Function Setting)181
- Error Display Enable/Disable181
- Operation Button ON/OFF Information182
  - Various Applications182
  - System Information - Operation Button ON/OFF Information182
- Specifying a Decimal/Hexadecimal Current Value Display Format182
17 Memory Cassette183
- Outline183
- Specifications183
  - Electrical Specifications183
  - Part Names and External Dimensions183
- Installation184
  - Installation (When the Expansion Board/Connector Conversion Adapter Is Not Used Together)184
  - Installation (When the Expansion Board/Connector Conversion Adapter Is Used Together)185
- Removal187
  - Removal (When the Expansion Board/Connector Conversion Adapter Are Not Used Together)187
  - Removal (When the Expansion Board/Connector Conversion Adapter Are Used Together)188
- Saved Data Content189
- PROTECT Switch190
- Memory Cassette <-> PLC (EEPROM Memory) Transfers by Loader Function191
  - Writing (WR: FX 3G -EEPROM-32L -> PLC)191
  - Reading (RD: FX 3G -EEPROM-32L <- PLC)192
- Memory Cassette Precautions for Use192
Appendix A: Special Device List193
- Appendix A-1 Special Auxiliary Relay (M8000 to M8511)193
- Appendix A-2 Special Data Register (D8000 to D8511)199
- Appendix A-3 Analog Expansion Boards [M8260 to M8269 and D8260 to D8269]204
- Appendix A-3-1 Special Auxiliary Relays (M8260 to M8269)204
- Appendix A-3-2 Special Data Registers (D8260 to D8269)204
- Appendix A-4 Analog Special Adapters [M8280 to M8289 and D8280 to D8289]205
- Appendix A-4-1 Special Auxiliary Relays (M8280 to M8289)205
- Appendix A-4-2 Special Data Registers (D8280 to D8289)206
Appendix B: Instruction List207
- Appendix B-1 Basic Instructions207
- Appendix B-2 Step Ladder Instructions207
- Appendix B-3 Applied Instructions208
Appendix C: Discontinued Models211
Warranty213
Revised History214

Questions and Answers

T
Thomas SullivanAug 3, 2025
What to do if my Mitsubishi Electric MELSEQ FX3S shows an over-scale detection error (b0, b1)?
- L
  Laura GarciaAug 3, 2025
  If your Mitsubishi Electric Controller displays an over-scale detection error, ensure that the input analog value remains within the specified range. Also, inspect the wiring to confirm it is correctly connected.
A
Arthur VanceAug 19, 2025
What to do if my Mitsubishi Electric MELSEQ FX3S Controller shows an averaging time setting error (b5)?
- E
  Erin AriasAug 19, 2025
  If your Mitsubishi Electric Controller shows an averaging time setting error, verify that the averaging time is correctly configured for each channel.