OVERVIEW

Official designation: Mitsubishi A0J2HCPU (MELSEC-A Series, CPU Unit)

Role/Application: A legacy central processing unit designed for the MELSEC-A series PLC, managing up to 480 I/O points and executing complex control logic with a fast instruction speed.

KEY SPECS SUMMARY

Power: 5 VDC 0.4 A internal consumption

Interfaces / Ports: RS-422 port, Base unit connector

Indicators: Refer to the latest manufacturer manual.

Operating Temp: 0 to 55 degrees C

Platform / Compatibility: MELSEC-A series base units

Limit: 480 I/O points maximum

Lifecycle: Discontinued by manufacturer

FREQUENTLY ASKED QUESTIONS

Technical Specifications:

Q: What is the basic instruction processing speed and memory capacity for the A0J2HCPU module?

A: The basic instruction processing speed is 1.25 microseconds, with 8K program and 32K RAM capacity.

Wiring & Installation:

Q: What are the necessary precautions before peeling the ingress prevention label from the module?

A: Be sure to peel the label before starting system operation for proper heat dissipation.

Troubleshooting & Compatibility:

Q: What self-diagnosis functions are included to detect problems within the PLC system?

A: Self-diagnosis functions include the watch dog timer error detection and power supply overcurrent protection.

Replacement & Upgrades:

Q: Which current Mitsubishi series is the recommended replacement for the obsolete MELSEC-A series controllers?

A: The current replacement series is the MELSEC iQ-R or MELSEC-Q series, often requiring conversion adapters.