GE Fanuc IC697BEM731 Series 90-70 Genius Bus Controller Module

Product Overview

The GE Fanuc IC697BEM731 is a high-performance Genius Bus Controller module. It belongs to the GE Series 90-70 programmable logic controller family. This single-slot module links the main CPU with remote I/O blocks and intelligent field devices.

The controller manages deterministic token-passing communication across the bus. It executes high-speed I/O scanning and transfers global data between CPUs. Additionally, it handles alarm processing to transmit time-stamped system faults directly to the processor data table.

An onboard Hand-Held Terminal (HHT) port enables simple local setup and diagnostic monitoring. The module executes automatic self-diagnostics at power-up to ensure stable industrial operations.

Technical Specifications

Installation & Setup Guide

• Slot Insertion: Turn off the base rack power before sliding the module into a single slot of the Series 90-70 rack.
• Network Wiring: Connect the Belden 9182 cable to the designated 3PL and 1PL bus connectors.
• Bus Termination: Install 75 Ohm or 150 Ohm termination resistors at both physical ends of the communication line.
• Addressing Setup: Connect an HHT device or use Windows/MS-DOS programming software to change the default address (Address 31).
• Baud Rate Matching: Match the baud rate across all bus devices to prevent communication loss.

System Compatibility & Diagnostics

• Hardware Compatibility: Interfaces directly with IC660 Genius I/O blocks, PCIM modules, and GE Series 90-70 CPUs.
• Global Data Support: Supports cyclic exchange of unacknowledged global data across multiple processors.
• Status LEDs: Three LED indicators display operational status, bus activity, and communication errors.
• Self-Diagnostics: Automatic internal diagnostic checks verify hardware integrity during power-up sequences.

Application Scenarios

• Distributed Plant I/O: Connects remote sensor banks across wide manufacturing environments.
• Inter-PLC Data Exchange: Coordinates synchronization between multiple Series 90-70 controllers using global data transfers.
• Turbine & Power Control: Transmits critical time-stamped alarms to central processing units without scanning delay.

Packaging, Shipping & Warranty

• Packaging List: 1x GE Fanuc IC697BEM731 Module enclosed in anti-static protective packaging.
• Fast Dispatch: Ships within 24 to 48 hours after order confirmation.
• Carrier Options: Express worldwide delivery via FedEx, UPS, and DHL.
• Warranty Protection: Covered by a comprehensive 12-month quality warranty.

Selection & Buyer's Guide

• Verify Distance Requirements: Confirm that your required line distance matches the selected baud rate specification.
• Check Node Limits: Ensure your total network layout does not exceed 30 devices per channel.
• Confirm Cable Specs: Always select approved Belden 9182 shielded twisted-pair cabling to avoid signal attenuation.

Frequently Asked Questions (FAQ)

Q: What are the default factory settings for the IC697BEM731?

A: The factory default bus address is set to 31, and the initial baud rate is set to 153.5 Kbaud.

Q: How do I change the baud rate or bus address of this module?

A: You can update configuration parameters using Windows-based software, MS-DOS configurator software, or a Hand-Held Terminal plugged into the rear port.

Q: What happens if one device on the bus operates at a different baud rate?

A: Mismatched baud rates will cause network communication failure or severe data packet instability across all connected nodes.

Q: Why is bus termination necessary on both ends of the cable?

A: Proper 75 Ohm or 150 Ohm resistors eliminate signal reflection, ensuring clean data transmission over long distances.

Global PLC Spare HUB's Insight

Our field engineers frequently assist plants upgrading or maintaining legacy control networks. In one instance, a customer reported intermittent comm drops on a 3,000-foot Genius network line. The IC697BEM731 was dropping packets during heavy motor starts.

Our team performed on-site signal inspection. We discovered missing termination resistors at the far-end junction box and an mismatched 153.5 Kbaud setting for that distance. Once we adjusted the network speed to 76.8 Kbaud and installed proper 150 Ohm termination resistors, network stability reached 100%. Proper physical installation and baud rate alignment are critical for long-distance Genius bus reliability.

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