What Makes the IC694BEM331C Genius Bus Controller Essential?
How do you connect a modern PACSystems RX3i controller to an existing Genius I/O serial bus without replacing the entire field network? The IC694BEM331C answers that question. It is a Genius bus controller module from the GE Fanuc / GE Intelligent Platforms PACSystems RX3i series, now owned by Emerson. This module acts as the communication bridge between the RX3i backplane and Genius I/O devices.
IC694BEM331C Technical Specifications
- Bus: Genius I/O serial bus
- Baud rate: 153.6 Kbaud, 76.8 Kbaud, 38.4 Kbaud (software selectable)
- Per-device data: 128 bytes
- Isolation: 2000 V
- Max modules per system: 8
- Supply voltage: 5 V DC
- Current draw: 300 mA
- Operating temperature: 0 to +60 °C
- Protection rating: IP20
- Dimensions (H×W×D): 145 × 34 × 140 mm
The 2000 V isolation stands out. It protects the RX3i backplane from ground loops and voltage spikes on the Genius bus. In addition, the software-selectable baud rate lets engineers match network speed to cable length and device count. Each device exchanges up to 128 bytes, which supports both discrete and analog Genius blocks.
Where the IC694BEM331C Fits in Industrial Networks
This module suits plants that already run Genius I/O and want to keep that investment. For example, a water treatment facility can retain its existing Genius field devices while upgrading the main controller to PACSystems RX3i. Similarly, a manufacturing line with legacy GE Fanuc I/O can integrate new RX3i logic without rewiring the bus. The 153.6 Kbaud setting supports the longest bus runs, while 38.4 Kbaud helps when noise or cable quality demands slower, more reliable transmission.
Integration and Compatibility Notes
The IC694BEM331C installs directly into an RX3i I/O rack. It communicates over the Genius I/O serial bus, so it works with Genius I/O blocks and compatible devices. A single system can host up to eight of these modules. When wiring into a Genius network, you may need an external gateway or connection module depending on your topology. Confirm cables, terminators, and gateways with AutoDCSTech before ordering.
Reliability and Maintenance
With an IP20 rating, the module belongs inside a clean control cabinet. Keep ambient temperature between 0 and +60 °C. Inspect connections periodically for corrosion or loose terminals. Because the unit draws only 300 mA at 5 V DC, it adds minimal load to the rack power supply. The 2000 V isolation reduces the risk of field-side faults reaching the backplane, which supports long service life in electrically noisy plants.
Availability and Support
Official Emerson production status is unverified. The IC694BEM331C is currently available in aftermarket channels as of September 2026. Please verify current lifecycle status and availability with AutoDCSTech before ordering. For engineering-grade precision in matching this module to your RX3i system, contact AutoDCSTech with your exact requirements for precise matching.
Q: What is the supply voltage for the IC694BEM331C?
A: It operates on 5 V DC and draws 300 mA from the RX3i backplane.
Q: Which baud rates does the IC694BEM331C support?
A: It supports 153.6 Kbaud, 76.8 Kbaud, and 38.4 Kbaud, all software selectable.
Q: How many IC694BEM331C modules can one system use?
A: A maximum of eight modules per system is allowed.
Q: Is the IC694BEM331C isolated?
A: Yes, it provides 2000 V isolation between the Genius bus and the RX3i backplane.
Availability & Condition at AutoDCSTech
| Part Number | IC694BEM331C |
|---|---|
| Availability | In Stock |
| Condition | New |
| Warranty | One Year |
| Origin | US |
