IC693CMM301 Series 90-30 GE Fanuc Global Data Module

IC693CMM301 – Genius Bus Communication for Series 90-30 PLC Systems

The GE Fanuc IC693CMM301 is a Genius Communications Module for the Series 90-30 PLC platform. It enables automatic Global Data exchange between the host PLC and other devices on a Genius bus.

Instead of relying on repeated application-level polling, the module broadcasts configured data automatically. Other compatible devices can receive this information through the shared bus database.

This architecture supports coordinated data exchange between PLC stations, programming equipment, and monitoring computers. It is useful for distributed control systems that require periodic sharing of real-time control information.

01 | Communication Architecture

• Host platform: GE Fanuc Series 90-30 PLC.
• Network: Genius serial communication bus.
• Communication method: Automatic and repeated Global Data transmission.
• Device capacity: Communication with up to 7 additional devices on the Genius bus.
• Supported data: Global Data exchanged through the shared database.
• Configuration: System programming software or a Hand-held Programmer.

The module can exchange Global Data with compatible Series 90-30 and Series 90-70 PLC systems. Other computers can also participate through suitable Genius communication hardware.

02 | Global Data Capacity and Allocation

The IC693CMM301 supports up to 256 bits (32 bytes) of Global Data per communications module. The configured data length can be adjusted in 32-bit increments.

• Maximum data length: 256 bits per module.
• Equivalent capacity: 32 bytes.
• Configuration increment: 32 bits.
• PLC memory: Global Data uses the Series 90-30 %G memory area.
• Data direction: The module can broadcast data and receive data from other configured devices.

Engineering note: The 256-bit limit applies to the module's Global Data capacity. It does not mean that every connected device receives a separate 256-bit data block. Actual allocation depends on the bus Device Numbers, configured data lengths, and available %G memory in the host PLC.

03 | Front-Panel Status and Diagnostics

Two LEDs provide basic information about module startup and Genius bus communication.

A blinking COM LED can indicate intermittent communication errors. Possible causes include electrical noise, incorrect bus wiring, baud-rate conflicts, or Device Number conflicts.

If COM remains off, check whether the host PLC has initialized the module configuration. Also inspect the bus condition before replacing the communication module.

04 | Installation and Commissioning Considerations

1. Check the host rack: Confirm that the target rack and Series 90-30 CPU support the module's hardware revision.
2. Install the module: Insert the module into the appropriate PLC backplate slot and secure its mechanical latch.
3. Connect the Genius bus: Follow the system wiring diagram for serial conductors, shield connections, and bus termination.
4. Configure the module: Use compatible system programming software or a Hand-held Programmer. The module has no configuration jumpers or DIP switches.
5. Assign communication parameters: Check the Device Number, baud rate, and Global Data length against the complete bus configuration.
6. Verify operation: Confirm that OK is on and COM remains steadily on during normal communication.

Commissioning advice: Record the original Device Number assignments and %G memory allocation before changing an existing installation. A configuration mismatch can interrupt data exchange even when the module itself passes its startup diagnostics.

05 | Technical Specifications

06 | Compatibility and Replacement Checks

The IC693CMM301 belongs to the legacy GE Fanuc Series 90-30 control platform. Before purchasing a replacement, verify more than the model number.

• Confirm the host PLC CPU model and firmware compatibility.
• Check the module's hardware revision and any applicable upgrade requirements.
• Verify the existing Genius bus baud rate and Device Number assignments.
• Compare the original Global Data configuration and %G memory allocation.
• Confirm the required communication path for Series 90-70 or other third-party devices.

For remote-rack applications, module revision is particularly important. Earlier hardware revisions may require an upgrade to support certain remote-rack configurations.

07 | Frequently Asked Questions

Q1: What should be checked when the IC693CMM301 shows OK but the PLC receives incorrect Global Data?

Start with the Device Number assignments and %G memory mapping. Then compare the sender's broadcast length with the receiver's configured data length. An active OK LED confirms module startup diagnostics, but it does not verify that the application uses the correct data addresses.

Q2: Can a replacement module work without rebuilding the original Genius bus configuration?

Do not assume the replacement will automatically inherit the previous settings. Record the original Device Number, baud rate, and Global Data allocation before removal. Configure the replacement to match the existing network, then verify communication with the host PLC and other bus devices.

Q3: Why can communication errors appear after adding another PLC to the Genius bus?

Check for duplicate Device Numbers and conflicting baud-rate settings first. Also review Global Data allocation because additional transmitting devices may occupy Device Number ranges required by other stations. Confirm that the bus wiring and termination remain correct after the network modification.

Q4: Does the 256-bit capacity mean the module can exchange 256 bits with every connected PLC?

No. The 256-bit figure is the maximum Global Data length per IC693CMM301. The available data space is shared through the Genius bus addressing and the host PLC's %G memory. The actual amount available to each station depends on the configured network allocation.

Q5: What information should be collected before replacing an IC693CMM301 in an operating plant?

Record the CPU model, module revision, Genius bus baud rate, Device Number, %G memory allocation, and current LED status. Save the PLC hardware configuration and communication settings where possible. These records help reduce commissioning time and make it easier to distinguish a module fault from a network configuration problem.

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