The Q01UCPU is a Universal Model programmable logic controller CPU from Mitsubishi Electric, part of the MELSEC-Q series, offering 10,000 program steps and built-in Ethernet connectivity as standard. It represents the entry point of the Q series Universal CPU range, combining the programming capacity suited to small-to-medium machine control tasks with the network integration and multiple CPU system capability that define the Universal Model generation. In stock at Atlantech Drives. Request your quote within 24–48 hours with worldwide shipping and 12-month warranty.
What Is the Mitsubishi Q01UCPU?
The Q01UCPU belongs to the Universal Model CPU sub-family within the MELSEC-Q platform, which superseded the earlier Basic and High Performance model CPUs (Q00CPU, Q01CPU) by introducing built-in Ethernet, multiple CPU system support, and online module change capability. The Q01UCPU provides 10,000 steps of program memory with a basic instruction execution time of 34 ns — sufficient for general-purpose machine sequencing, discrete manufacturing control, and building automation applications that do not require the extended memory or processing speed of higher-tier Universal Model CPUs (Q02UCPU and above). The built-in Ethernet port (10/100BASE-TX) supports MELSOFT connection, MC Protocol, and SLMP, enabling direct integration with SCADA systems, HMI panels, and engineering workstations without requiring a separate network module.
Key Technical Specifications
- Program memory: 10,000 steps
- Basic instruction execution time: 34 ns
- I/O device points: 8,192 (X/Y)
- Internal relay (M): 8,192 points
- Data register (D): 12,288 points
- Built-in Ethernet: 10/100BASE-TX (RJ-45), 1 port
- Ethernet protocols: MELSOFT, MC Protocol (3E/4E frame), SLMP
- Multiple CPU system: Supported (up to 4 CPUs)
- Online module change: Supported
- USB port: Mini-B (programming connection)
- Power supply module: Requires separate Q series PSU (Q61P, Q62P, etc.)
- Compatible base units: Q3□B, Q5□B, Q6□B main bases and extension bases
- Operating temperature: 0 to 55°C
- Applicable software: GX Works2, GX Works3 (with restrictions)
Series Comparison & Selection Guide
Within the MELSEC-Q Universal Model CPU range, the Q01UCPU is positioned at the entry level. Key distinctions for selection:
- Q00UCPU vs Q01UCPU: The Q00UCPU provides 8,000 steps and does not support multiple CPU system operation. The Q01UCPU adds 2,000 steps and multiple CPU support, making it the preferred minimum specification for systems that may later require a motion CPU or process CPU in the same base.
- Q01UCPU vs Q02UCPU: The Q02UCPU provides 20,000 steps, faster instruction execution (20 ns), and a larger device memory. If the application involves complex ladder logic with more than 8,000 active rungs, or requires SFC (Sequential Function Chart) programming with many steps, the Q02UCPU is the appropriate upgrade.
- Q01UCPU vs Q03UDECPU: The Q03UDECPU adds built-in SD card slot, extended data logging, and significantly faster execution (9.5 ns). For SCADA-integrated systems with data logging requirements or high-speed processing needs, the Q03UDECPU represents the correct step up.
Maintenance Tips
- The Q01UCPU contains a lithium battery (Q6BAT) that maintains program memory and the real-time clock during power-off. Battery life is typically 5 years at 25°C. Replace the battery before the LOW BATTERY LED illuminates to avoid memory loss — Mitsubishi recommends proactive replacement at 4-year intervals in high-ambient-temperature environments (above 40°C), where battery life is reduced to approximately 3 years.
- Back up the CPU program and parameter data to a PC using GX Works2 at regular intervals and after every program modification. Although the Q01UCPU’s flash memory retains the program without battery power, the data registers and retentive devices (M, D, etc.) are battery-backed and will be lost if the battery fails before a backup is taken.
- When the CPU is installed in a multiple CPU system, verify after any maintenance activity that the CPU operating mode switches (RUN/STOP/RESET) are in the correct position on all CPUs before powering up — inadvertent RESET on one CPU in a multiple CPU system can cause a controlled stop of all CPUs sharing the same base.
- Use the GX Works2 System Monitor function (Diagnostics → System Monitor) to check error history and LED status codes after any unexpected CPU STOP event — the Q01UCPU stores the last 16 error events with timestamps, which is invaluable for root-cause analysis of intermittent faults.
Frequently Asked Questions
Q: Can the Q01UCPU run programs written for the older Q01CPU (Basic Model)?
A: Yes, with minor considerations. Programs written for the Q01CPU (Basic Model) can generally be used on the Q01UCPU after conversion in GX Works2. However, instructions exclusive to the Universal Model (such as SLMP communication instructions) cannot run on Basic Model CPUs, and vice versa. Always perform a compilation check in GX Works2 after CPU model conversion.
Q: Does the Q01UCPU support redundant CPU configurations?
A: No. Redundant CPU operation requires the QnPRHCPU (Process CPU with Redundant function). The Q01UCPU supports multiple CPU systems (up to 4 CPUs in one base) but not hot-standby redundancy with automatic CPU switchover.
Q: What is the maximum number of I/O modules that can be connected to a Q01UCPU system?
A: The Q01UCPU supports up to 8,192 I/O points (X/Y device range), distributed across the main base and up to 7 extension bases. The physical maximum depends on the base unit configuration — a Q68B main base with 8 slots plus seven Q68B extension bases provides up to 64 module slots, but total I/O points are capped by the 8,192-point device limit regardless of physical slot count.
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