GE Fanuc Series 90-30 IC693BEM321 I/O Link Interface Master/Slave Module

Module Overview

The IC693BEM321 is a specialized communication interface designed for the GE Fanuc Series 90-30 PLC platform. This module serves as a bridge for the proprietary I/O Link protocol, allowing for the integration of remote I/O devices or peer-to-peer data exchange between controllers. Unlike its predecessor (the IC693BEM320, which operated strictly as a slave), the IC693BEM321 provides enhanced flexibility, supporting both Master and Slave configurations depending on the system requirements. It is a critical component for distributed control architectures where localized I/O must report back to a central Series 90-30 CPU.

Detailed Technical Specifications

The IC693BEM321 utilizes dual high-speed serial ports to manage high-density data packets across the I/O Link network.

Operational and Integration Notes

The IC693BEM321 is frequently utilized in systems where a Series 90-30 PLC must control a FANUC CNC or an older Series 90-20 rack. When configured as a Master, it can poll multiple slave devices on a multi-drop network. In Slave mode, the module presents its assigned I/O points to a remote Master controller. Engineers should ensure that proper termination resistors (120 Ohm) are applied at both physical ends of the RS-485 daisy chain to prevent signal reflection and data corruption.

Functional Comparison: IC693BEM321 vs. IC693BEM320

While both modules share the same physical footprint, their capabilities differ significantly:

• IC693BEM321: Supports both Master and Slave roles. This is the recommended replacement for all legacy I/O Link applications.

• IC693BEM320: Limited to Slave functionality only. This model is discontinued and lacks the updated firmware found in the 321 version.

Technical FAQ

Can the IC693BEM321 be used for Modbus RTU communication?

No. The IC693BEM321 is dedicated to the GE Fanuc I/O Link protocol. For Modbus RTU requirements, a dedicated communication co-processor like the IC693CMM311 is required.

Does this module require external power?

The module logic is powered entirely by the PLC backplane (350 mA draw). However, the communication bus may require a separate reference ground depending on the distance and environmental noise of the installation.

How is the I/O count determined?

The number of points (32 or 64) is defined in the configuration within Proficy Machine Edition. This setting must match the expectations of the Master controller on the network to ensure successful data synchronization.