GE Series 90-70 IC697BEM731 PLC Genius Network Interface Module

Product Description

The IC697BEM731 acts as the primary interface between the GE Series 90-70 PLC CPU and a Genius I/O serial bus. By serving as the bus master, the module coordinates the flow of control data and diagnostics between the host controller and a variety of field devices, including I/O blocks, power tracs, and other PLCs. This communication is governed by a robust token-passing protocol, which prevents data collisions and ensures that each device on the network receives timely access to the bus.

Operational Versatility and Configuration

Engineers can easily integrate the IC697BEM731 into existing architectures using Windows-based configuration tools or an MS-DOS environment. While the module ships with a default bus address of 31 and a standard baud rate of 153.6 Kbaud, these parameters remain fully adjustable to meet specific site requirements. Furthermore, the inclusion of a dedicated Hand-Held Monitor (HHM) port allows for local monitoring and troubleshooting without interrupting the primary control logic.

Network Distance and Media Specifications

The transmission range of the Genius network depends significantly on the selected baud rate. Consequently, users must ensure all devices on a single bus operate at an identical speed to maintain network synchronicity.

• 153.6 Kbaud (Standard): Supports distances up to 2,000 feet.
• 153.6 Kbaud (Extended): Supports distances up to 3,500 feet.
• 76.8 Kbaud: Supports distances up to 4,500 feet.
• 38.4 Kbaud: Supports maximum distances up to 7,500 feet.

To achieve these specifications, the system requires high-quality shielded twisted-pair cabling, such as Belden 9182. Proper termination is essential, utilizing either 75-ohm or 150-ohm resistors depending on the specific network topology.

Diagnostics and System Reliability

This module prioritizes system uptime by providing continuous self-diagnostics. The IC697BEM731 identifies internal hardware faults and network errors, reporting them directly to the PLC’s internal alarm system. Additionally, front-panel LED indicators offer real-time status updates regarding the controller’s health and the current state of bus communications, simplifying the commissioning process.

Technical Specifications