The Q13UDEHCPU is a Universal Model High-Speed CPU from Mitsubishi Electric for the MELSEC-Q series, providing 260,000 program steps, built-in Ethernet, and a basic instruction execution time of 1.9 ns — placing it among the highest-performance CPUs in the Q series Universal Model range. In stock at Atlantech Drives. Request your quote within 24–48 hours with worldwide shipping and 12-month warranty.
What Is the Mitsubishi Q13UDEHCPU?
The Q13UDEHCPU belongs to the UDEH sub-family within the MELSEC-Q Universal Model CPU range — the «H» suffix denoting the High-Speed variant that achieves 1.9 ns basic instruction execution versus the 9.5 ns of the standard UDECPU. The Q13UDEHCPU provides 260,000 steps of program memory, built-in Ethernet (10/100BASE-TX) with MC Protocol and SLMP support, a built-in SD card slot for data logging and program backup, and multiple CPU system support for up to 4 CPUs in the same base. It is designed for large-scale machine control, process automation, and high-throughput manufacturing systems where instruction execution speed and program capacity are critical performance parameters.
Key Technical Specifications
- Program memory: 260,000 steps
- Basic instruction execution time: 1.9 ns
- I/O device points: 8,192 (X/Y)
- Internal relay (M): 32,768 points
- Data register (D): 25,600 points
- Built-in Ethernet: 10/100BASE-TX, 1 port
- Ethernet protocols: MELSOFT, MC Protocol (3E/4E frame), SLMP, Web server
- Built-in SD card slot: Yes (data logging, recipe, program backup/restore)
- Multiple CPU system: Supported (up to 4 CPUs)
- Online module change: Supported
- USB port: Mini-B
- Compatible base units: Q3□B, Q5□B, Q6□B main and extension bases
- Operating temperature: 0 to 55°C
- Applicable software: GX Works2, GX Works3 (with restrictions)
Architecture & Design Overview
The Q13UDEHCPU’s 1.9 ns instruction execution speed is achieved through a dedicated high-speed execution engine that processes basic sequence instructions (LD, OUT, AND, OR) in a single pipeline stage, compared to the multi-stage execution path of standard Universal Model CPUs. This performance level is significant for applications with large program sizes (200,000+ steps) where scan time accumulation from instruction execution — rather than I/O refresh — becomes the dominant cycle time component. The built-in SD card slot enables the Data Logging function to record device values, alarm histories, and production counters to SD card at configurable sampling intervals without impacting scan time, using the background processing engine independent of the CPU’s ladder execution cycle. The web server function embedded in the built-in Ethernet port allows real-time PLC device monitoring and limited data write via a standard web browser without MELSOFT software, which is useful for remote status checks and basic diagnostics from tablets or smartphones on the plant network. The Q13UDEHCPU supports iQ Works system design integration, enabling unified project management across MELSEC-Q PLCs, MELSERVO motion controllers, and GOT HMI panels in GX Works2.
Expert Tips
- At 1.9 ns per basic instruction, the Q13UDEHCPU can execute approximately 526 million basic instructions per second. For programs with 260,000 steps composed entirely of basic instructions, the minimum achievable scan time from instruction execution alone is approximately 0.5 ms — real-world scan times will be higher due to I/O refresh, communication processing, and END processing overhead. Use the GX Works2 scan time monitor (Diagnostics → Module Diagnostics → Scan Time) to measure actual scan time after program download.
- The SD card data logging function supports up to 16 simultaneous logging settings, each with independent device lists, sampling intervals (1 ms minimum), and trigger conditions. Use binary format logging rather than CSV for high-frequency sampling (below 100 ms intervals) to reduce SD card write load and extend card service life.
- In multiple CPU system configurations, assign high-computation tasks (floating-point arithmetic, complex data processing) to the Q13UDEHCPU and use lower-cost Universal Model CPUs (Q01UCPU, Q02UCPU) for I/O-intensive but computationally simple tasks — this optimises system cost while maintaining maximum throughput where processing speed matters.
- The Q13UDEHCPU’s built-in Ethernet port supports simultaneous connections from up to 8 MELSOFT clients and 16 MC Protocol clients. For systems with multiple SCADA clients and engineering workstations accessing the CPU concurrently, verify that total connection count does not exceed these limits to avoid connection refusal errors during peak usage periods.
Frequently Asked Questions
Q: What is the difference between Q13UDEHCPU and Q13UDECPU?
A: Both are Universal Model CPUs with 260,000 steps and built-in Ethernet. The Q13UDEHCPU is the High-Speed variant with 1.9 ns basic instruction execution; the Q13UDECPU executes at 9.5 ns. For applications where scan time is not a constraint, the Q13UDECPU offers equivalent functionality at lower cost. Specify the Q13UDEHCPU when minimum scan time is a system requirement.
Q: Is the Q13UDEHCPU compatible with MELSEC iQ-R base units?
A: No. The Q13UDEHCPU is designed exclusively for MELSEC-Q base units (Q3□B, Q5□B, Q6□B series). MELSEC iQ-R systems use a different CPU and module form factor that is physically and electrically incompatible with Q series hardware.
Q: Can the Q13UDEHCPU be used in a redundant system configuration?
A: No. Redundant CPU operation within the MELSEC-Q platform requires the QnPRHCPU (Process CPU with Redundant function). The Q13UDEHCPU supports multiple CPU systems but not hot-standby redundancy with automatic switchover.
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