40K-step CPU for medium-scale Q Series racks
The Q04UDVCPU is a Mitsubishi Electric CPU module for the Q Series programmable logic controller platform, running a stored program cyclic operation. It handles programs up to 40K steps and supports up to 4096 I/O points (X/Y) with a refresh I/O control mode — the standard for this family. The instruction set covers 859 instructions, including ladder, list, SFC (MELSAP3/MELSAP-L), function block, and structured text (ST). This breadth means the same CPU can serve both legacy relay-logic migrations and newer ST-based motion or process blocks without a processor swap.
I/O budget and power draw for rack sizing
Total I/O device points are 8192 (X/Y), with 4096 physical I/O points addressable. That is enough for a medium-to-large machine cell — a multi-station assembly line or a packaging skid with several remote racks — without needing a second CPU for I/O handling. The module draws 0.58 A from the 5 VDC backplane supply (0.6 A with an extended SRAM cassette). In a Q-series rack, this must be summed with the power supply module's rating — typical Q6-series supplies provide 3 A or 6 A at 5 V, so this CPU leaves headroom for a dozen I/O or special-function modules on the same backplane. A built-in SD memory card interface (SD and SDHC) supports data logging, recipe storage, and firmware updates without a dedicated programming tool connected. This is the standard method for field upgrades on Q-series CPUs.
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