Mitsubishi Electric Q2ASCPU-S1 MELSEC QnAS Series CPU Module

Managing complex automation sequences in space-restricted panels is the primary role of the Mitsubishi Electric Q2ASCPU-S1, a high-performance compact CPU module designed for the MELSEC QnAS Series control platform. Engineered to deliver rapid instruction execution and extensive memory capacity, this processor handles demanding industrial applications requiring short cycle times and large recipe storage capacity within a compact footprint.

Key Features

• 60k Steps Program Capacity: Supports large-scale control logic, complex algorithms, and extensive recipe management.
• High-Speed Processing: Achieves basic instruction execution speeds of 0.15 microseconds for rapid system response.
• Expanded I/O Control: Direct addressing and management of up to 1024 local and remote I/O points.
• Integrated Communication: Built-in RS-232C interface facilitates direct connection to HMIs, programming PCs, and peripheral devices.
• Backward Compatibility: Integrates seamlessly with existing MELSEC AnS series backplanes and specialized I/O modules.

Applications

• Multi-axis packaging and labeling machinery requiring high-speed synchronization.
• Automated material handling, sorting, and conveyor distribution networks.
• Water and wastewater treatment facility distributed control systems.
• Food and beverage batch processing lines with complex recipe configurations.

Technical Specifications

Connections and Interfaces

Empirical Engineering Insights

Alternative Models & Compatibility

The Q2ASCPU-S1 acts as a direct, high-capacity upgrade to the standard Q2ASCPU (which is limited to 28k steps). It shares identical physical dimensions and backplane mounting configurations. When migrating from older AnS series CPUs (such as the A1SCPU or A2SCPU), the Q2ASCPU-S1 allows you to retain your existing I/O chassis and modules, though program conversion via GX Developer or GX Works2 is required to map the updated instruction set and register structures.

Application Pitfalls & Engineering Notes

This CPU utilizes volatile RAM for its primary program execution. To prevent program loss during extended power shutdowns, a functional backup battery (A6BAT) must be maintained. If the "BAT.ERR" LED illuminates on the front panel, the battery must be replaced within 7 days. For critical applications, it is highly recommended to install an optional non-volatile memory cassette (such as the Q2MEM-8MBA) to store a permanent backup of the parameters and logic.

Commissioning & Wiring Tips

When establishing serial communications via the built-in RS-232C port, ensure that your cable configuration matches the handshaking requirements of your connected device. If using a standard 3-wire connection (TXD, RXD, SG), you must jumper pins 7 (RTS) and 8 (CTS) together on the CPU side to prevent communication timeouts. When configuring GX Developer, select "Q2AS(H)" as the PLC type to enable full instruction compatibility during download.

Installation Guidelines