Mitsubishi R04CPU MELSEC iQ-R PLC CPU Module
Machine Control and Execution
The Mitsubishi R04CPU is a MELSEC iQ-R PLC CPU with a 40K-step program capacity. It uses stored-program cyclic operation and processes LD instructions in 0.98 ns. Initial, scan, fixed-scan, event, and standby execution types support different control tasks.
I/O operates in refresh mode. Direct access is also available through DX and DY addressing.
Memory and Performance Specifications
| Parameter |
Specification |
| Program capacity |
40K steps |
| Program memory |
160K bytes |
| Device/label memory |
400K bytes |
| Data memory |
2M bytes |
| CPU buffer memory |
1072K bytes, equivalent to 536K words |
| Fixed-scan communication area |
24K words, included in CPU buffer memory |
| Refresh memory |
2048K bytes |
| SD/SDHC card capacity |
Up to 32 GB |
| I/O capacity |
4,096 points |
| Constant scan setting |
0.2–2,000 ms, in 0.1 ms increments |
| LD instruction processing time |
0.98 ns |
Programming and Connectivity
Ladder diagram and structured text support sequence control and calculations. Function blocks organize reusable logic. System, local, and global labels simplify variable management.
Built-in Ethernet and USB provide engineering and communication access. Separate I/O modules connect field devices to the system.
Industrial Applications
The R04CPU suits packaging machines, automated assembly lines, conveyor systems, and production equipment. Fixed-scan execution supports tasks that require regular processing intervals. Event execution allows selected programs to run when configured conditions occur.
FAQ
Q1: What is the program capacity?
A: 40K steps, equivalent to 160K bytes.
Q2: Can the CPU access I/O directly?
A: Yes. Direct access uses DX and DY addressing.
Q3: What SD card capacity is supported?
A: SD/SDHC cards up to 32 GB.
Q4: Can the scan time be kept constant?
A: Yes. Set 0.2–2,000 ms in 0.1 ms increments.
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