What Is SCADA? Supervisory Control Without Replacing the PLC
SCADA sits above PLCs and RTUs: it acquires field data, alarms operators, and issues supervisory commands across plants and remote assets—without replacing local deterministic control.

Optimized for high-speed sequence processing within demanding manufacturing lines, the Mitsubishi Electric Q04UDVCPU delivers exceptional instruction speeds and native Ethernet connectivity for modern MELSEC Q Series architectures. This Universal model is designed to handle multi-discipline control configurations, enabling rapid sequence execution, integrated communications, and flexible memory management. With its advanced processing backplane, it reduces system cycle times and provides direct support for modern field bus architectures and host-level databases.
| Parameter | Specification |
|---|---|
| Manufacturer | Mitsubishi Electric |
| Model Code | Q04UDVCPU |
| Series | MELSEC Q Series (High-Speed Universal Model QCPU) |
| Control Method | Stored program cyclic operation |
| I/O Processing Mode | Refresh mode |
| Program Capacity | 40K Steps |
| I/O Device Points [X/Y] | 8192 Points |
| Physical I/O Points [X/Y] | 4096 Points |
| Internal Current Consumption (5 VDC) | 0.58 A (Base CPU), 0.60 A (with SRAM cassette installed) |
| Memory Card Interface | SD and SDHC Memory Cards |
| Dimensions (H x W x D) | 98 mm x 27.4 mm x 115 mm |
| Weight | 0.20 kg |
| Country of Origin | Japan |
| Interface Type | Connector / Format | Functional Assignment |
|---|---|---|
| Ethernet Port | RJ45 (10BASE-T/100BASE-TX) | Host network communication, HMI link, and programming interface |
| USB Port | Mini-B USB (USB 2.0 High Speed) | Direct programming, system diagnostic monitoring, and parameter download |
| SD Card Slot | Standard SD Card Slot | CSV data logging, system restoration, and parameter retention |
The Q04UDVCPU is a direct functional upgrade from the older Q04UDEHCPU. Key improvements include a transition from standard SRAM/Flash memory cards to standardized SD/SDHC cards, as well as a dramatically optimized bus cycle speed. When migrating code from "UDEH" models to the newer "UDV" series in GX Works2, execute a "Change PLC Type" operation and verify the Ethernet open ports setting, as the socket communication parameters may require minor adaptation due to the upgraded internal Ethernet chip capabilities.
In applications with high levels of industrial noise, the built-in Ethernet port must be configured with proper noise countermeasures. Ensure that any communication timeouts are set slightly higher if the CPU is heavily polled by concurrent SCADA and third-party OPC servers, as the TCP stack on the built-in Ethernet port can face socket resource exhaustion if connection releases are not managed cleanly in code.
Always use high-quality shielded twisted-pair (STP) cables for the Ethernet connections. Ensure the main Q-Series rack is securely grounded to the cabinet's master functional earth bus using a heavy gauge, low-impedance conductor. This grounding mitigates potential high-frequency noise spikes from nearby variable frequency drives (VFDs) from disrupting high-speed cyclic processing.
Disconnect all primary AC and auxiliary DC power sources before attempting to mount or unmount the CPU module from the base unit. Failure to fully de-energize the rack before slot insertion or removal can result in catastrophic internal backplane damage and module failure.
Inspect the main base unit backplane female connectors for debris or misaligned pins before physical installation.
Hook the bottom mounting projection of the CPU module into the base unit's guide hole, aligning the module parallel to the rack.
Push the top of the module firmly onto the backplane connector until it clicks securely into position. Tighten the module fixing screw to prevent mechanical vibration displacement.
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| Country of origin |
United States
|