Mitsubishi A2NCPU Programmable Controller

The Mitsubishi A2NCPU is a programmable controller CPU module within the MELSEC A series, offering enhanced features compared to conventional A1CPU, A2CPU, and A3CPU models. This CPU provides the processing core for industrial automation systems requiring reliable sequence control, data handling, and communication capabilities. It is designed for integration with Mitsubishi automation architecture in manufacturing, process control, and machinery applications.

Technical Specifications

The A2NCPU features programmable memory architecture supporting logical operations, sequence control, timing, counting, and arithmetic operations. The processing speed for basic LD instructions is 0.25 µs per step, enabling fast response for time-critical control tasks. Program capacity is 30K steps, accommodating substantial control programs. The I/O point capacity reaches 1024 points, supporting large-scale system configurations. Servo program capacity of 13K steps and support for up to 8 control axes enable integration with SSCNET-connected servo amplifiers. Internal RAM memory capacity is 64k, with E2PROM providing 32k of non-volatile storage.

Key Features

• Program capacity 30K steps, I/O points up to 1024

• Processing speed 0.25 µs per LD instruction

• I/O control mode switching: direct mode, refresh mode, or mixed

• Constant scan function for predictable execution intervals

• Real-time clock with year, month, day, hour, minute, second support

• Online I/O module loading/unloading with power applied

• Compatibility with ACPU sequence programs

• Support for up to 8 control axes with servo program capacity 13K steps

• SSCNET interface for servo amplifier connection

• QnA/ACPU bus connection compatibility

I/O Control Modes

The AnNCPU series introduces flexible I/O control mode switching, offering three distinct operating modes. Direct mode transfers ON/OFF data each time a corresponding instruction is executed, enabling pulse signals to be output to external devices during a single scan. I/O image refresh mode transfers ON/OFF data after the END instruction is executed, ensuring that program conditions remain unchanged throughout each scan and achieving higher processing speed than direct mode. Mixed mode allows input in direct mode with output in refresh mode or vice versa. This flexibility allows engineers to optimize the balance between I/O responsiveness and program execution speed based on specific application requirements.

Advanced Programming Features

The A2NCPU supports constant scan function, which executes the sequence program at specified intervals regardless of program complexity. This ensures predictable control cycle timing for applications where consistent scan times are critical. The real-time clock maintains accurate time data, transferable to special relays for visual indication on the CPU front panel LED. Online I/O module loading and unloading capability allows module replacement without powering down the system, reducing maintenance downtime. The CPU also incorporates a clock function and compatibility with ACPU sequence programs, facilitating migration from earlier A series CPUs.

System Configuration

The A2NCPU integrates into MELSEC A series systems, connecting with power supply modules, I/O modules, and communication units. It supports QnA/ACPU bus connection for expansion and compatibility with various GOT models including A985, A975, A970, and A960 series. The module dimensions are 5.5 cm by 12.1 cm by 25.0 cm, with weight approximately 0.9 kg. The CPU module is designed for mounting within A series racks, connecting to the system backplane for power and communication with peripheral modules.

Applications

The A2NCPU is deployed in industrial automation applications including manufacturing line control, machine tools, packaging equipment, material handling systems, and process control installations. The support for SSCNET servo communication makes it suitable for motion control applications requiring coordinated multi-axis positioning. The program capacity and I/O point support accommodate medium to large automation systems where A series architecture is deployed.

Conclusion

The Mitsubishi A2NCPU programmable controller CPU module provides advanced control features for MELSEC A series automation systems. With flexible I/O control modes, constant scan capability, online module replacement, and support for SSCNET servo control, it offers significant enhancements over earlier A series CPUs. For facilities operating Mitsubishi A series automation, the A2NCPU delivers reliable control processing for a wide range of industrial applications.