Mitsubishi Electric Q4MCA-2MBS MELSEC-Q Series Expansion SRAM Cassette

Description

Engineered for high-speed data processing and expansion within the MELSEC-Q control architecture, the Mitsubishi Electric Q4MCA-2MBS is a high-reliability Static RAM (SRAM) memory cassette. This hardware-level module expands the available volatile storage capacity of compatible high-performance Q-Series CPU modules, enabling handling of extensive file registers, recipe data, system logging, and trace functions. Because it utilizes high-speed SRAM technology, it provides near-instantaneous read and write execution cycles crucial for time-critical industrial processes.

Key Features

• 2 Megabytes Capacity: Provides expanded storage space dedicated to device memory and file registers.
• High-Speed Access: Low-latency volatile memory technology designed to match high-performance PLC CPU cycle times.
• Direct Interface: Slide-in installation directly into the designated CPU memory cassette slot.
• Industrial Durability: Solid-state architecture built to withstand severe physical vibrations and temperature swings common to factory floor environments.

Applications

• Expanded recipe handling and production batch tracking on assembly lines.
• High-density data logging, trending, and diagnostic buffering in process automation.
• Storage of extensive coordinate systems, tool matrices, and motion profiles in complex packaging systems.

Technical Specifications

Empirical Engineering Insights

Application Pitfalls & Engineering Notes

Because this expansion card uses volatile SRAM technology, memory retention is fully dependent on the host CPU battery system (such as the Q6BAT). If the system is powered down and the CPU battery level drops below the operational threshold, all register data and files hosted on the memory cassette will be permanently lost. It is critical to implement regular automated backups from the volatile cassette to a non-volatile flash ROM card or external SCADA/HMI server.

Commissioning & Handling Tips

Before mounting or unmounting the cassette, verify the static potential of your work area. Always wear an ESD-grounded wrist strap when handling the card to prevent localized electrostatic discharge from damaging the exposed memory bus contacts on the rear connector interface.

Installation Guidelines