1. Product Overview
The Coolmay QM3G-50FH series is an integrated Human Machine Interface (HMI) and Programmable Logic Controller (PLC) designed for industrial automation applications. This device combines a touch panel display with a powerful PLC, offering a compact and efficient solution for control and monitoring tasks.
Key features include compatibility with Mitsubishi programming software (GX Developer, GX Works2), support for PID auto-tuning, and PWM modulation. The device is built with an ARM9 core and imported components for guaranteed quality.
Figure 1: Front view of the QM3G-50FH HMI PLC Combo.
Figure 2: Rear view of the QM3G-50FH HMI PLC Combo, highlighting I/O and communication ports.
Product Models
The QM3G-50FH series offers various configurations. The specific model covered in this manual is the QM3G-50FH-24MT/R.
- QM3G-50FH-24MT: 5-inch HMI PLC all-in-one, 12 Digital Inputs (DI), 12 Digital Outputs (DO) with transistor outputs. Optional maximum 4 Analog Inputs (AD) and 2 Analog Outputs (DA). Includes 1 RS232, 1 RS485, 4 high-speed pulse outputs (100KHz, Y0-Y3), and 4 high-speed pulse outputs (10KHz, Y4-Y7).
- QM3G-50FH-24MR: 5-inch HMI PLC all-in-one, 12 Digital Inputs (DI), 12 Digital Outputs (DO) with relay outputs. Optional maximum 4 Analog Inputs (AD) and 2 Analog Outputs (DA). Includes 1 RS232, 1 RS485.
Note: Analog input and output functions are optional and must be purchased separately. The number of selected analog channels cannot exceed the maximum quantity for the specific model.
Figure 3: Various QM3G HMI PLC All-in-one Product Models.
2. Setup and Installation
2.1 Package Contents
- 1x HMI PLC all-in-one unit
- Mounting hardware (clips/screws)
- (Optional) Programming cables (USB-232 serial, 232 programming, Type-C HMI, Type-C PLC)
2.2 Mounting Dimensions
Ensure adequate space for installation and ventilation. Refer to the diagram below for precise cutout and overall dimensions for the QM3G-50FH model.
Figure 4: QM3G-50FH Mounting Dimensions (Cutout size: 143x86mm, Overall: 151x96x36mm).
2.3 Wiring
All wiring should be performed by qualified personnel. Ensure the power supply is disconnected before making any connections. The device requires a DC24V input.
2.3.1 Power Supply and Grounding
Connect the FG (Frame Ground), 0V (Negative), and DC24V (Positive) terminals as shown in the rear view diagram. Proper grounding is essential for stable operation and safety.
2.3.2 Digital Input/Output Wiring
The digital input (X) is an externally powered DC24V sinker (passive NPN). The input signal is isolated from the power supply. Connect COM to the positive 24V of the external power supply while using. The digital output terminals are grouped, and each group is electrically isolated. For relay outputs, COM is common to the positive or negative. For transistor outputs, COM is common to the negative.
Figure 5: PLC Internal Output Wiring Diagram (Diagram 14 from manual).
Figure 6: Equivalent Circuit Diagrams for PLC I/O.
2.3.3 Analog Input/Output Wiring (Optional)
For models with analog capabilities, refer to the specific wiring diagrams. Analog inputs support various types including voltage (0-5V, 0-10V), current (0-20mA, 4-20mA), and temperature sensors (Thermocouple J/K, PT100, PT1000, NTC10K/100K). Analog outputs support voltage (0-5V, 0-10V) and current (0-20mA, 4-20mA).
Figure 7: PLC Analog Wiring Diagram (Diagram 15 from manual).
2.3.4 Communication Ports
The device includes RS232 and RS485 communication ports. Ethernet and WIFI are optional features. Refer to the pin definitions for proper connection.
Figure 8: Basic Parameters and Communication Port Options.
2.3.5 Programming Cable Connections
To program the HMI PLC, connect the appropriate programming cables to your computer and the device. The image below illustrates a typical setup.
Figure 9: Example Programming Cable Connections.
3. Operating Instructions
3.1 Powering On and Initial Screen
Once properly wired and powered, the HMI PLC will boot up and display the configured interface. The touch panel allows for interaction with the system.
Video 1: Product demonstration showing HMI interface navigation and features, including system upgrade, full functions, and customizable options.
3.2 HMI Interface Navigation
The HMI features a touch-sensitive screen for navigating menus, inputting data, and monitoring processes. The interface can be customized using the programming software.
Figure 10: HMI displaying a control interface.
3.3 PLC Programming
The PLC can be programmed using Mitsubishi software such as GX Developer (versions 8.86 and 8.52) and GX Works2. Refer to the respective software manuals for detailed programming instructions.
3.3.1 Analog Input Register Operation
Analog input register operation is 12-bit precision. Input values can be read from D0 to D400. The constant scan time is 100. For temperature inputs, the corresponding value is the temperature in degrees Celsius, with a decimal point. For example, 182.0°C is represented as 1820.
3.3.2 Analog Output Register Operation
Analog output register operation is 12-bit precision. Output channels (DA0-DA7) correspond to the analog output value. The set value range is 0-4000. For 0-20mA output, D8058.7=0. For 4-20mA output, D8058.7=1.
Figure 11: Programming Reference and Analog Register Details.
4. Maintenance
4.1 General Care
- Keep the device clean and free from dust and debris. Use a soft, dry cloth for cleaning.
- Avoid exposing the device to extreme temperatures, humidity, or direct sunlight.
- Ensure proper ventilation around the unit to prevent overheating.
4.2 Power-Off Hold Functions
The HMI PLC's device power-off maintenance is permanently maintained. All data in the HMI and PLC areas are not lost after the module is powered off. The real-time clock uses a rechargeable battery to ensure that the clock is current. All power-off hold functions must ensure DC24V. The voltage after the source is loaded is 23V or more, and the PLC power-on time is longer than 2 minutes, otherwise the power-off function will be abnormal.
4.3 Environmental Conditions
The device is designed to operate within specific environmental parameters:
- Operating Temperature: 0°C - 50°C
- Relative Humidity: 5% - 95% RH (non-condensing)
- Storage Temperature: -20°C - 70°C
- Vibration Frequency: 10-57Hz, amplitude 0.035mm; 57Hz-150Hz, acceleration 4.9m/s² (10 times each on X, Y, Z, total 60 minutes each).
5. Troubleshooting
This section provides guidance for common issues. For complex problems, contact technical support.
5.1 User Tips for Troubleshooting and Safe Operation
Figure 12: Important User Tips.
- Power Supply: Always use a regular power supply that matches the specified voltage (DC24V). Ensure the power supply output voltage is 18W or higher and 24V.
- Wiring: Before installation, tighten screws and clamp guides to avoid falling. Incorrect wiring can cause electric shock or circuit fault.
- Grounding: Properly ground the device. Improper grounding can cause abnormal operation. Do not drop metal shavings and wire tips into the control vent holes.
- Short Circuits: Do not short-circuit the power supply. This can cause product malfunctions and faults.
- Communication: Keep communication cables short (under 10m) and away from strong interference sources.
- External Power: The digital input is an externally powered DC24V leakage type (passive NPN). Connect to the positive 24V pole of the external power supply.
- Common Terminal: The COM of the binary input/output (transistor) is common to the cathode.
- Disassembly: Do not disassemble the product or modify the wiring optionally. Otherwise, it may cause fault, malfunction, loss of time.
- Damage: Make sure to turn off all power when you install or dismantle the product, otherwise it may cause malfunction or fault.
6. Specifications
The following table details the specifications for the QM3G-50FH model and other related models in the series.
Figure 13: Specifications and Parameters Table.
General Specifications (QM3G-50FH)
| Feature | Description |
|---|---|
| Display Screen | 5" TFT LCD screen |
| Resolution | 800*480 |
| Dimensions | 151*96*36mm |
| Cutout Size | 143*86mm |
| Display Size | 108*65mm |
| Brightness | 300cd/m² |
| Contrast Ratio | 400:1 |
| Backlight | LED |
| Display Color | 65536 true color |
| Touch Type | 4-wire resistive panel |
| ROM (Flash) | NOR Flash 16MB |
| RAM | 64MB |
| CPU | 408MHz |
| USB Device | USB 2.0 (Type-C) |
| Serial Port | RS-232 |
| I/O Type (Digital) | Transistor output: low level NPN, COM connected to negative; Relay output: normally open dry contact. |
| High-speed Counting | 6 channel 60KHz, 2 channel 10KHz, 1 channel 60KHz |
| High-speed Pulse | 8 channel 10KHz, 4 channel 100KHz |
| Analog Input Types (Optional) | PT100/PT1000/Thermocouple/NTC/0-5V/0-10V/0-20mA/4-20mA |
| Analog Output Types (Optional) | 0-5V/0-10V/0-20mA/4-20mA |
| Weight | 600g |
| Package Dimensions | 25cm (L) x 15cm (W) x 10cm (H) |
7. Warranty and Support
For warranty information, technical support, and service inquiries, please refer to the official Coolmay website or contact your authorized dealer. This manual provides operational guidance and does not cover specific warranty terms or support procedures.
Additional resources, including detailed HMI and PLC programming manuals, can be found on the Coolmay official website or through your supplier.
