

The Mitsubishi Q20UDEHCPU and Q20UDHCPU are flagship CPU modules within the renowned Q Series programmable logic controller family, engineered for demanding industrial automation tasks. The Q20UDEHCPU integrates a high-speed Ethernet port for advanced connectivity, while the Q20UDHCPU offers a cost-effective option without built-in Ethernet, both delivering exceptional processing power and reliability. With a basic instruction speed of 9.5 ns, these CPUs enable real-time control in applications such as manufacturing, packaging, and material handling. Their 200K-step program capacity and 8192 I/O points support complex, multi-axis systems, while the extended SRAM cassette port allows for additional memory expansion. Designed for harsh environments, these modules ensure stable operation with stored program cyclic control and constant scan time settings. Below is a comprehensive specification table derived from official Mitsubishi documentation.
| Item | Q20UDEHCPU | Q20UDHCPU |
|---|---|---|
| Control method | Stored program cyclic operation | Stored program cyclic operation |
| I/O control mode | Refresh | Refresh |
| Extended SRAM cassette port | 9.5 ns | 9.5 ns |
| Constant scan (function for keeping regular scan time) | 0.5…2000 ms (setting available in units of 0.5 ms) | 0.5…2000 ms (setting available in units of 0.5 ms) |
| Program capacity | 200K steps | 200K steps |
| Number of I/O device points [X/Y] | 8192 points | 8192 points |
| Number of I/O points [X/Y] | 4096 points | 4096 points |
| Internal relay [M] | 8192 points | 8192 points |
| Latch relay [L] | 8192 points | 8192 points |
| Link relay [B] | 2048 points | 2048 points |
| Timer [T] | 0 point | 0 point |
| Retentive timer [ST] | 1024 points | 1024 points |
| Counter [C] | 12288 points | 12288 points |
| Data register [D] | 0 point (extended data register: 131072 points) | 0 point (extended data register: 131072 points) |
| Extended data register [D] | 8192 points | 8192 points |
| Link register [W] | 0 point | 0 point |
| Extended link register [W] | 2048 points | 2048 points |
| Annunciator [F] | 2048 points | 2048 points |
| Edge relay [V] | 2048 points | 2048 points |
| Link special relay [SB] | 2048 points | 2048 points |
| Link special register [SW] | 655360 points | 655360 points |
| File register [R, ZR] | 8192 points | 8192 points |
| Step relay [S] | Max. 20 points | Max. 20 points |
| Index register/standard device register [Z] | Max. 10 points | Max. 10 points |
| Index register [Z] (32-bit ZR indexing) | 8192 points | 8192 points |
| Pointer [P] | 256 points | 256 points |
| Interrupt pointer [I] | 2048 points | 2048 points |
| Special relay [SM] | 2048 points | 2048 points |
| Special register [SD] | 16 points | 16 points |
| Function input [FX] | 16 points | 16 points |
| Function output [FY] | 5 points | 5 points |

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