Select GE Fanuc 90-70 PLC Memory Modules

Navigating GE Fanuc 90-70 PLC Memory: A Guide to IC697MEM Modules

Optimizing Legacy Control Systems with the Right Memory Choice

In the world of industrial automation, the GE Fanuc Series 90-70 PLC remains a trusted platform. Its performance heavily relies on its memory module. This guide explores the IC697MEM713, MEM715, MEM717, MEM719, and MEM731 models. We will clarify their functions and differences. Moreover, we provide expert advice for selecting the correct component for your factory automation needs.

The Critical Role of PLC Memory

PLC memory stores the control program and operational data. The CPU constantly accesses this information to run your machinery. It is the core of the control system. Therefore, selecting the proper memory ensures reliable and efficient operation. Different applications demand different memory types and sizes.

Comparing Volatile and Non-Volatile Memory

The key distinction lies in data retention. The IC697MEM713, MEM715, MEM717, and MEM719 are SRAM modules. They require a battery to maintain the program during a power loss. In contrast, the IC697MEM731 uses Flash EPROM technology. This non-volatile memory retains data permanently without a battery. This fundamental difference greatly impacts system reliability.

Detailed Memory Module Specifications

Let’s examine each model’s capacity and best use cases.

• IC697MEM713: This module offers 32K words of SRAM. It suits smaller, less complex control tasks.
• IC697MEM715: With 64K words, it provides a common choice for mid-range PLC programs.
• IC697MEM717: This 128K-word SRAM module supports more extensive logic and data handling.
• IC697MEM719: It delivers a high 512K-word capacity for large, data-intensive DCS applications.
• IC697MEM731: This 256K-word Flash module guarantees program integrity without a battery.

A Practical Guide for Module Selection

Choosing the right module depends on your application’s needs. For critical systems where program loss is unacceptable, the non-volatile MEM731 is the best option. For large-scale processes with vast memory demands, the MEM719 is suitable. The mid-range SRAM modules offer a cost-effective solution for standard factory automation lines.

Author’s Insight: Modern control design strongly favors non-volatile memory. While SRAM modules were once standard, the industry now prioritizes maintenance-free reliability. For sustaining legacy 90-70 systems, upgrading to the MEM731 often proves most cost-effective long-term.

Real-World Application Scenarios

These modules drive various industrial processes.

• MEM713/MEM715: Perfect for packaging machinery, conveyor systems, and pump control.
• MEM717: Fits automotive welding and assembly line controls.
• MEM719: Handles large-scale process control in water treatment or chemical plants.
• MEM731: Essential for safety shutdown systems and harsh environments.

Solutions for Modern Legacy System Support

Many plants still operate Series 90-70 PLCs. A key strategy is to audit existing memory types. Replacing aging battery-backed SRAM with Flash memory reduces downtime risk. This proactive approach enhances overall control system trustworthiness. It is a smart investment in operational resilience.

Frequently Asked Questions (FAQ)

Q1: What is the main disadvantage of the IC697MEM713 module?
A1: Its small 32K SRAM capacity and reliance on a battery for data retention are its primary limitations.

Q2: Can I replace an SRAM module with the IC697MEM731 Flash module?
A2: Yes, the MEM731 is a direct replacement and is highly recommended for improved reliability.

Q3: Which memory module has the largest capacity for the 90-70 PLC?
A3: The IC697MEM719 offers the largest capacity at 512K words.

Q4: Why does the MEM731 not need a battery?
A4: It uses non-volatile Flash EPROM technology, which permanently stores the program without power.

Q5: For a new legacy system installation, which module should I choose?
A5: The IC697MEM731 is the best choice for new installations due to its superior data integrity.