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RX3i BEM331 Communication

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SKU 2174152  UPC 0799705793453


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Other Available Revisions for the IC694BEM331 IC694BEM331AIC694BEM331BIC694BEM331CIC694BEM331-LT

Common misspellings:
  • 1C694BEM331
  • IC69ABEM331
  • IC6948EM331
  • IC694BEM33l
  • IC694BEM331

Technical Specifications for IC694BEM331

ManufacturerGE Fanuc
SeriesRX3i PACSystems
Part NumberIC694BEM331
Product TypeBus Controller Module
Exchange Rate128 Data Bytes
LED Indicators2
Bus Termination Resistor Ratings75/100/120/150 Ohms
Transient1500 Volts
Current300 mA
Voltage5V DC

Product Description

The GE Fanuc IC694BEM331 Genius Bus Controller interfaces a PACSystems RX3i and a Genius I/O serial bus. In addition to the Bus Controller, the bus will also serve: Genius blocks, remote drops, VersaMax and Field Control I/O Stations, PLCs with Genius Bus, Genius Hand-Held Monitor (HHM), and numerous hosts. Featuring 128 bytes exchange with each device on the Genius I/O bus, the Genius blocks and other devices report faults in an automatic fashion, including alarms and certain other previously defined issues to the bus controller. The bus controller then manages any diagnostic messages it receives, which are then read by the CPU routinely. Faults can then be displayed in the fault table if the programming software is employed.

The IC694BEM331 maintains all Genius datagrams and can send up to 128 bytes of Global Data with each bus review. Global data is data that is spontaneously and mechanically broadcast. Up to eight Genius bus controllers can be incorporated in the system with each transferring up to 128 bytes.

LEDs are found on the front of the controller to specify operating status. With advanced diagnostic capabilities, the daisy chained bus cable uses a single twisted pair plus shield or Twinax. However, fiber optic cable and modems can also be used. The largest length of the bus is 7800 feet at 4Kbaud, 4500 feet at 76.8 Kbaud, 3500 feet at 153.6 Kbaud, and 2000 feet at 153.6 Kbaud standard. The highest number of devices for this unit is 32 at all baud rates except the 38.4 Kbaud or 16 devices at 38.4 Kbaud. The controller is well-suited with multiple series and can trade global data with an RX3i Genius bus controller with firmware version 1.5 or higher. The user should know that no handheld monitor connector is available on the module, but a handheld monitor can interconnect with the controller.

The IC694BEM331 controller is a Genius I/O Bus controller manufactured by GE Fanuc Automation as a member of the RX3i PACSystems product line. It is designed to interface seamlessly with the RX3i PACSystems controllers as well as the serial Bus I/O. This controller is well matched with and works with various blocks, remote drops, controllers, handheld monitoring devices, and I/O stations. The IC694BEM331 controller allows for exchange of up to 128 data bytes on the I/O bus at one time. There are 2 LED indicators on the front of this Genius I/O Bus controller to show the status of operation and communication bus status. These 2 LED indicators turn green when the module is in regular operation. It supports various data rates which are configurable, for instance, it comes with a rate of 153.5 Kbaud for standard and extended communication. This unit also comes with possible communication rates of about 76.8 Kbaud and 38.4 Kbaud.

The GE Fanuc RX3i PACSystems IC694BEM331 Genius I/O Bus controller has resistors rated at 75 Ohms, 100 Ohms, 120 Ohms, and 150 Ohms for the bus termination and the resistors are found on both ends of the electric bus cable. This GE Bus controller features a Hi-pot isolation rating of 2000 Volts, with a transient common mode rejection rating of 1500 Volts. The GE Fanuc IC694BEM331 Bus controller unit is controlled through the Proficy Machine Edition programming software. It has 300 milliamps of rated current with a voltage rating of 5 Volts DC. This unit also has improved diagnostic abilities and it can detect various errors and faults while the PLC system is in operation.

Technical Information


Current Consumption

300mA at 5Vdc, maximum


Advanced diagnostics capabilities


Global Data and Datagrams

Data Length

128 bytes per message

Data Rates

Configurable:  153.5kbaud  standard/extended,  76.8kbaud, or 38.4kbaud

Genius Bus Specifications

Bus Type

Daisy-chained bus cable; single twisted-pair plus shield or Twinax. Fiber optical cable and modems can also be used.

Bus Termination

75, 100, 120, or 150  resistor at both ends of electrical bus cable.

Maximum Bus Length

7800 feet at 38.4kbaud, 4500 feet at 76.8kbaud, 3500 feet at 153.6kbaud extended, 2000 feet at 153.6Kbaud standard. Maximum length at each baud rate also depends on cable type, as listed in the Genius System and Communications Manual GEK-90486-1

Maximum Number of Devices

32  devices  at all  baud  rates except 38.4kbaud. 16  devices at 38.4kbaud.


2000 volts Hi-Pot, 1500 volts transient common mode rejection.


Troubleshooting IC694BEM331

Troubleshooting information is available on IC694BEM331's website page; it also includes a datasheet user-manual and a wiring diagram.


Repair your IC694BEM331

PDF Supply can repair your IC694BEM331 in 3-5 business days. And PDF Supply stands by all of its repairs with a 1 year customer satisfaction warranty.

Customer Questions and Answers

  • Question:  What is an IC694BEM331?  Answer:  The IC694BEM331 is a Genius Bus Controller Module from the GE Fanuc RX3i Series.
  • Question:  What does IC694BEM331 do for the RX3i system?   Answer:  This module interfaces a PACSystems RX3i and a Genius I/O serial bus.
  • Question:  What else does the IC694BEM331 serve?  Answer:  In addition to the Bus Controller, the bus can serve:  Genius blocks, other PLCs with Genius Bus Controllers, Remote Drops, VersaMax and Field Control I/O Stations. 
  • Question:  What is the capacity of the IC694BEM331?  Answer:   The bus controller can exchange up to 128 bytes with each device on the Genius I/O bus.
  • Question:  How many IC694BEM331 can be included in an RX3i system?  Answer:  Up to 8 Genius Bus Controllers can be included in an RX3i system.
  • Question:  Where must IC694BEM331 be located?  Answer:  IC694BEM331 can be installed in any available backplane slot.
  • Question:  What should I do if my IC694BEM331 is not working properly?  Answer:  Your IC694BEM331 may need repair.

For more information on the IC694BEM331 Genius Bus Controller Module of the GE Fanuc RX3i Series, please see the Datasheet User-Manual.


 Coming soon

ST. LOUIS, Feb. 1, 2019 – Emerson today announced it has completed the purchase of Intelligent Platforms from General Electric.
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