Product Description

​The Mitsubishi A1NCPUR21 is a CPU module from the MELSEC A Series, designed to provide high-performance control in industrial automation applications. It supports a maximum of 2048 I/O points and offers a program capacity of 30,000 steps for both main and sub-sequences. The module operates with a processing speed ranging from 1.0 to 2.3 microseconds per step, depending on the control method. It features a built-in watchdog timer with adjustable intervals from 10 to 2000 milliseconds, ensuring system reliability. The A1NCPUR21 is compatible with MELSECNET and MELSECNET/B communication protocols, facilitating seamless integration into Mitsubishi's networked control systems.

Technical Specifications

• Model: A1NCPUR21
• Series: MELSEC A Series
• Control Method: Stored program, repeated operation
• I/O Control Mode: Selectable refresh or direct mode
• Programming Language: Sequential control language
• Main Program Capacity: 30,000 steps
• Sub-Program Capacity: 30,000 steps
• Processing Speed: 1.0–2.3 µs per step (direct mode), 1.0 µs per step (refresh mode)
• Watchdog Timer: 10–2000 ms adjustable
• Communication Protocols: MELSECNET, MELSECNET/B
• Internal Relays: 1000 points (M0–999)
• Latch Relays: 1048 points (L1000–2047)
• Timers: 2048 points
• Counters: 256 points
• Data Registers: 1024 points
• File Registers: 8192 points
• Accumulator: 2 points (A0, A1)
• Index Registers: 2 points (V, Z)
• Pointer Registers: 256 points (P0–255)
• Interrupt Pointers: 32 points (I0–31)
• Dimensions: 250 mm (H) × 79.5 mm (W) × 121 mm (D)
• Weight: 1.75 kg
• Operating Temperature: 0°C to 55°C
• Storage Temperature: -25°C to 75°C
• Humidity: 5% to 95% RH (non-condensing)
• Certifications: UL/cUL, CE