Product Core Brief

• Model:
• Brand: GE
• Series: PACSystem RX3i
• Core Function: Acts as Genius bus master, enabling RX3i CPU to communicate with legacy Genius remote I/O blocks, VersaMax stations and Genius-capable controllers.
• Product Type: Genius Bus Master Communications Module
• Key Specs: Up to 32 bus nodes | Software-selectable baud rates | 128 byte device data exchange limit Note: Mature legacy hardware; new original stock limited, surplus and refurbished inventory widely traded. Fits main RX3i PCI backplanes; not supported on serial expansion racks.

Key Technical Specifications

• Bus Protocol: Genius Serial I/O Bus (Master mode only)
• Supported Baud Rates: 38.4 kbps, 76.8 kbps, 153.6 kbps
• Maximum Connected Nodes: 32 Genius bus devices per module
• Per-Device Data Exchange: 128 bytes input, 128 bytes output per node
• Global Broadcast Data: 128 bytes transmit / 128 bytes receive
• Backplane Power Draw: 30 mA @5 VDC
• Field Bus Interface: Screw terminal RS-485
• Status LEDs: OK (module health), COM (bus activity)
• Operating Temperature: 0°C to 60°C horizontal cabinet mounting
• Storage Temperature: -40°C to 85°C
• Relative Humidity: 5%–95% non-condensing
• Maximum Cable Length: Speed-dependent; 1066 m @153.6 kbps, 2286 m @38.4 kbps
• System Limit: Up to eight of these modules can be installed within a single RX3i system
• Termination: External 120Ω resistor required at physical bus endpoints

Product Introduction

This unit serves as a protocol bridge between modern RX3i controllers and existing Genius bus infrastructure, common on older process and manufacturing plant retrofits. It scans all connected Genius nodes and transfers I/O data to the host CPU backplane.

All bus parameters, node addressing and data mapping are configured inside Proficy Machine Edition. No hardware jumpers are required to adjust communication speed or network behavior.

QA & Testing SOP (Transparency Building)

1. Incoming Inspection: Confirm part marking and hardware revision. Inspect backplane edge pins for bending or corrosion; check terminal block assembly for damage.
2. Live Testing: Mount into validated RX3i main rack, apply backplane power. Establish Genius bus connection to a test Genius node and run continuous 24-hour cyclic data exchange.
3. Electrical Testing: Use Fluke 115 to monitor backplane rail stability. Insulation resistance testing must exceed 10MΩ between bus terminals and chassis ground.
4. Firmware/Config Backup: Log module firmware revision. Photograph terminal wiring layout before disassembly.
5. Final QC & Packaging: Place unit inside anti-static shielding. Attach dated QC test tag confirming bus communication validation prior to shipment.

Installation Pitfalls & Guide (Engineer to Engineer)

❗ Backplane Slot Restriction: This module cannot operate on IC694 serial expansion backplanes. It must be installed in the main IC695CHSxxx PCI universal rack. ❗ Missing Bus Termination: Uninstalled 120Ω end resistors cause signal reflections, leading to intermittent node dropouts and communication CRC errors. Terminate both physical cable ends. ❗ Baud Rate Mismatch: All devices on one Genius bus must share identical baud rate settings. Mismatched speeds result in zero bus traffic and steady COM LED off state. ❗ ESD Dangers: Un-grounded handling can damage RS-485 transceiver circuitry. Static damage often creates random communication glitches without visible hardware defects. ❗ Hot Swap Risk: Hot insertion may disrupt the active Genius bus and trigger loss of all remote I/O. Lockout-tagout bus wiring if performing replacement on running systems.

Replacement Guide:

1. Pre-install: Back up hardware configuration, photograph bus wiring, record programmed baud rate and node address table.
2. Removal: De-energize field bus wiring; unlock module latches and slide unit straight out without twisting connectors.
3. Install: Seat new unit fully into main rack PCI slot, lock latches, reattach Genius bus terminal wiring and fit required termination resistors.
4. Power-on Test: Restore power, download saved configuration, verify OK and COM LEDs operate normally, confirm all Genius nodes are recognized by the CPU.

FAQ (Frequently Asked Questions)

Q: Can this module be installed inside an IC694CHS392 serial expansion rack? A: No. The bus interface relies on PCI backplane signaling. Serial expansion racks do not provide the required communication channels and will not recognize the module.

Q: Does this module support hot swapping? A: Mechanical hot insertion is physically possible, but live removal disrupts the entire Genius bus network. Planned replacement requires field bus isolation to avoid process upsets.

Q: Can multiple modules run separate independent Genius networks in one RX3i rack? A: Yes. A single RX3i system supports up to eight modules, each controlling an isolated Genius bus segment with separate wiring.

Q: What is the difference between and IC693BEM331? A: IC693BEM331 is designed for Series 90-30 racks. is optimized for RX3i PCI backplanes. They are not direct interchangeable hardware.

Q: Will hardware configuration transfer directly from an existing unit to a replacement? A: Configuration imports without modification. Always verify bus termination and baud rate after replacement to eliminate communication faults.

Q: Can this module operate as a Genius bus slave device? A: No. It functions exclusively as bus master. If you need slave mode, select alternative legacy communication hardware.

Q: Can I connect Genius handheld monitors (HHM) to this bus? A: Yes. A compatible HHM can tap onto the Genius bus for live diagnostics and node configuration while the controller remains online.