Coolmay EX3S HMI PLC All in One 4.3 7 inch FX3U Compatible

Coolmay EX3S HMI PLC All in One 4.3 7 inch FX3U Compatible

The Coolmay EX3S Series is the company's standard-range HMI + PLC all-in-one — a touch panel and PLC controller integrated into a single unit. The conventional approach is "HMI panel + separate PLC + a communication cable between them"; an all-in-one compresses that combination into one panel-mounted device, eliminating one PLC, one layer of wiring and one device slot in the cabinet. For compact machines, standalone automation or retrofit projects, this is the most direct route to cost reduction. Coolmay has focused on its own HMI, PLC and all-in-one products since 2006, with monthly output of roughly 50,000 units. The most valuable aspect of this series is its compatibility with Mitsubishi's FX range. Coolmay states that the PLC section is compatible with FX3G, FX3U and FX3S, so it can be programmed directly with GX Works2 — software engineers already know.

On hardware, the EX3S uses a 400 MHz CPU with 32K program capacity, 32K retentive registers (32-bit capable, power-fail retaining) and 16 MB onboard NOR Flash. Functionally it supports interrupts, linear and circular interpolation and PID auto-tuning — the interpolation capability means it covers simple two-axis motion applications rather than logic control alone. I/O and analogue configuration varies by model: the EX3S-8043H-24MT (4.3") provides 12DI / 12DO plus 4 analogue inputs (2 × 0–10 V, 2 × 0–20 mA) and 2 analogue outputs (0–10 V, 0–20 mA); the 7-inch models (EX3S-8070H-44M(R)T) provide 24DI PNP 24 VDC plus 20 hybrid outputs (relay + transistor). Across the series the maximum is 30DI / 30DO and 16AD / 8DA.

For communication and commissioning, the all-in-one carries two PLC programming ports plus one HMI download port. On the PLC side you can optionally add 1–2 RS485 ports, CAN, WiFi or an Ethernet port; on the HMI side, RS232/RS485. Programs can be uploaded and downloaded in one action over USB or Ethernet, and remote commissioning over 4G / WiFi is supported — so once a machine is shipped overseas, no one has to travel to site to change the program.

Product Highlights

1. HMI and PLC in one unit — eliminates a separate PLC, a layer of communication wiring and one cabinet device slot
2. PLC compatible with Mitsubishi FX3G / FX3U / FX3S — programmable with GX Works2, reusing existing ladder programs and habits
3. 400 MHz CPU, 32K program capacity + 32K retentive registers, 16 MB onboard NOR Flash
4. Interrupts plus linear and circular interpolation — covers simple two-axis motion, not just logic control
5. PID auto-tuning — no manual tuning for closed-loop temperature or pressure applications
6. Integrated analogue I/O — 4.3" model has 4AD (2 × 0–10 V, 2 × 0–20 mA) + 2DA; series maximum 16AD / 8DA
7. I/O up to 30DI / 30DO — the 7" model offers hybrid relay + transistor outputs, balancing load capacity and service life
8. Two PLC programming ports + one HMI download port; PLC-side options include 1–2 × RS485, CAN, WiFi and Ethernet
9. One-action program upload/download over USB or Ethernet, with 4G / WiFi remote commissioning
10. Modbus RTU support; 22–14 AWG pluggable terminals and power consumption of only 4–6 W

Technical Specifications

Applications

FAQ

Q1. What is the real advantage of an all-in-one over "HMI + separate PLC"? Three practical points. (1) Fewer components and less space — no separate PLC, no HMI-to-PLC communication cable or terminal blocks, and one less device slot, so the cabinet can be smaller. (2) Lower cost — one device replaces two, reducing both purchase cost and assembly labour. (3) Faster commissioning — internal communication is already established, so there is no protocol configuration or communication fault-finding between HMI and PLC, which visibly shortens factory commissioning time. The trade-off is flexibility: an all-in-one has a fixed PLC point count and expansion capability, so if I/O requirements are expected to grow substantially, a split solution is more comfortable.

Q2. Does the PLC section really run Mitsubishi FX programs? Coolmay states that the EX3S PLC is compatible with FX3G, FX3U and FX3S and can be programmed with Mitsubishi's official GX Works2. In instruction set and programming habits, the PLC side therefore follows the FX family and engineers need not learn new software. Two things to note: (1) some FX-specific features (particular special registers or special module instructions) should be checked against Coolmay's manual for support; (2) we strongly recommend running your main program on one sample unit before adopting in volume — the responsible approach.

Q3. What software programs the HMI and the PLC? Two separate tools. The HMI uses Coolmay's official mView software, Coolmay's own HMI programming platform, which is stable and designed for industrial use. The PLC uses Mitsubishi GX Works2. Each writes through its own port: the device provides two PLC programming ports plus one HMI download port, so HMI and PLC can be debugged online separately without repeatedly swapping a single cable.

Q4. How should I read the analogue configuration? Taking the EX3S-8043H-24MT (4.3") as an example: 4 analogue inputs (2 × 0–10 V voltage type and 2 × 0–20 mA current type) plus 2 analogue outputs (0–10 V and 0–20 mA). This mixed configuration is practically useful at selection stage — voltage inputs take potentiometers and sensors, while current inputs take transmitters (pressure or level 4–20 mA transmitters, for example), with no extra analogue module needed. The series maximum is 16AD / 8DA, with the actual point count determined by model and options.

Q5. Should I choose transistor or relay outputs? It depends on the load and switching frequency. Transistor (MT): no contacts, long life and fast response (microsecond range), suited to high-frequency switching such as high-speed pulse output and servo/stepper pulse commands, but with limited load capacity (around 500 mA maximum on the MX3G platform) and DC loads only. Relay (MR): high contact rating, usable for AC and DC, strong surge withstand, suited to contactor coils and solenoid valves, but mechanical contacts have a limited operation count and are unsuitable for high frequency. Hybrid (MRT): combines both — some points use relays for heavy current loads and others use transistors for high-speed switching; the 7-inch model offers hybrid outputs.

Q6. Does it support remote programming and networking? Yes. Programs can be uploaded and downloaded in one action over USB or Ethernet, and the PLC side can optionally add Ethernet, WiFi or 4G for remote commissioning and program updates — so once a machine is exported, no engineer has to travel to site to change a program or diagnose a fault, a clear cost advantage in export business. Where multiple machines need centralised monitoring, optional RS485 (1–2 ports) or CAN can connect to a higher-level system, with Modbus RTU support.