IC694BEM331LTC GE Fanuc RX3i Genius Bus Controller Module
Manufacturer: GE Fanuc
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Part Number: IC694BEM331LTC
Condition：New with Original Package
Product Type: Communication Modules
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Country of Origin: USA
Payment:T/T, Western Union
Shipping port: Xiamen
Warranty: 12 months
GE Fanuc IC694BEM331LTC PACSystems RX3i Genius Bus Controller Module
Configured for serial bus interface management in PACSystems RX3i platforms, the GE Fanuc IC694BEM331LTC (IC694BEM331 Genius Bus Controller Module) provides direct physical/electrical execution. The module acts as an interface master linking RX3i CPUs with Genius I/O blocks, VersaMax drops, and legacy Series 90-30 controllers. Supporting token-passing Genius serial protocol across shielded twisted-pair, Twinax, or optical fiber networks, the module handles up to 32 network devices with 128-byte data payload exchanges per bus scan while consuming 300 mA from the +5 VDC backplane supply rail.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | IC694BEM331LTC |
| Brand | GE Fanuc |
| Origin | USA |
| Weight | 0.60 kg |
| Dimensions | Standard RX3i single-slot footprint |
| Operating Temp | 0 to +60 deg C |
| Power Consumption | 300 mA @ +5 VDC (1.5 W maximum) |
| Protocol Support | Genius I/O token-passing serial protocol |
| Data Exchange Capacity | 128 bytes per device per bus scan |
| Supported Baud Rates | 38.4 Kbaud, 76.8 Kbaud, 153.6 Kbaud (standard/extended) |
| Maximum Connected Devices | 32 devices (153.6K / 76.8K), 16 devices (38.4K) |
| Physical Medium | Shielded single twisted-pair, Twinax, or fiber optic with modems |
| Isolation Voltage | 2000 V Hi-Pot; 1500 V transient common-mode rejection |
| Network Termination | 75, 100, 120, or 150 Ohm resistors |
| System Capacity | Up to 8 modules per PACSystems RX3i rack system |
| Status Indicators | OK (module status), COM (bus communication status) LEDs |
Deterministic Networks & Firmware Integration
The IC694BEM331LTC maintains deterministic Genius Global Data transfers, executing cyclic broadcast messages across multiple host controllers without software overhead on the main CPU. Internal firmware flash compatibility ensures synchronized network frame timing across token-passing loops, transmitting up to 128 bytes sent and 128 bytes received per scan cycle. Galvanic isolation circuits rated at 2000 V Hi-Pot protect internal RX3i backplane bus communication lines from transient electrical field surges on long cable runs up to 7,800 ft.
Frequently Asked Questions
Q: What termination resistor values are required for the Genius serial bus cable ends?
A: Termination resistance depends on cable impedance, requiring 75, 100, 120, or 150 Ohm resistors installed across the signal pair at both physical ends of the electrical bus.
Q: How many IC694BEM331LTC Genius Bus Controller modules can install into a single RX3i system?
A: Up to 8 Genius Bus Controller modules can operate concurrently within a single PACSystems RX3i system rack.
Q: What is the impact of selecting a 38.4 Kbaud transmission speed on maximum node capacity?
A: Operating at 38.4 Kbaud extends maximum bus length to 7,800 ft but limits maximum active network nodes from 32 down to 16 devices.
Field Installation Guidelines
Power down the PACSystems RX3i chassis before seating the module into any available I/O expansion slot. Align the rear card guides with the backplane connectors and push firm until the upper and lower plastic retention clips snap into position.
Strip the shielded twisted-pair or Twinax cable sheath to expose the serial signal line pair and shield braid. Connect the signal pair to the removable terminal block, ensuring correct polarity across all daisy-chained nodes. Connect the cable shield directly to the designated shield terminal on the module, ensuring a solid low-impedance ground path to the cabinet earthing bar to maintain the 1500 V transient common-mode rejection performance.