IC694BEM331 GE Genius Bus Controller for RX3i PACSystems

The IC694BEM331 is a single-slot Genius Bus Controller (GBC) that connects any RX3i PACSystems rack to GE's proven Genius I/O network. Supporting up to 32 daisy-chained devices and 2,048 digital I/O points on a single bus, the module is ideal for plants that want to keep existing Genius blocks while upgrading the CPU to high-speed RX3i. Data rates of 38.4 kbaud over twisted-pair cable (shielded or fibre with repeaters) ensure deterministic updates ≤ 5 ms typical.

• Legacy-friendly - re-use IC660BBD/IC660EBD/IC660ELD blocks installed since the 1990s
• Deterministic scan - 2 ms token rotation for 32 devices @ 38.4 kbaud
• On-board diagnostics - LED indicators for token pass, CPU fault, bus short, loss of shield
• Auto-baud detection - simplifies start-up; no DIP switches to set
• Remote configuration - configure drop numbers, global data and defaults from Proficy Machine Edition
• Hot-swap supported - insert/remove under power when rack power budget allows
• Industrial temp - 0…+60 °C operating, -40…+85 °C storage, 5 g vibration, 50 g shock

• Discrete: IC660BBD020/021/022/023/024/025
• Analog: IC660EBA020/021/023/024/025/026
• RTD/Thermocouple: IC660ELB921/922
• Power-trac: IC660ELP001 (fibre repeater)

1. Power down rack OR verify < 70 % power budget for hot-swap.
2. Insert module in any RX3i I/O slot; secure captive screws to 0.4 N*m.
3. Wire twinax - strip 10 mm, insert under clamp, torque 0.3 N*m; maintain shield continuity.
4. Assign drop # - use Proficy Machine Edition > Hardware Configuration > Genius Bus > Auto-scan.
5. Verify token - green "TOKEN" LED flashes every 2 ms when bus healthy.
6. Save & download - store configuration in CPU flash for retention across power cycles.