GE IC697BEM721 Series 90‑70 Bus Expansion Module

Description

Hardware & Electrical Specifications

‑ Model: IC697BEM721 ‑ Part Number: IC697BEM721 ‑ Module Type: Series 90‑70 Main‑Rack Bus Expansion Module, occupies one slot on Series 90‑70 backplane ‑ Mounting: Standard Series 90‑70 main rack only; cannot be used in remote expansion racks ‑ Backplane power consumption:  • +5 VDC: 650 mA maximum ‑ Expansion bus interface: D‑Sub 50‑pin female connector for remote‑rack parallel bus cable ‑ Max supported remote racks: 7 remote racks per BEM721 ‑ Max cable length: 200 m between BEM721 and first BEM731 remote module ‑ Bus topology: Daisy‑chain connection for multiple remote racks ‑ Matching remote‑rack partner module: IC697BEM731 ‑ Diagnostics: Module self‑test, cable link fault, remote rack dropout detection, parity error checking, fault alarm reported to Series‑90‑70 CPU ‑ PCB treatment: Conformal coated for dust, moisture and corrosion resistance ‑ Compatibility note: Only for Series 90‑70 platform; incompatible with RX3i / VersaMax hardware. Must pair with IC697BEM731 in every remote rack. Hot‑swap is prohibited. After replacement, download hardware configuration and perform remote‑rack online validation test.

Environmental Specifications

‑ Operating temperature: 0 ℃ ~ +60 ℃ ‑ Storage temperature: −40 ℃ ~ +85 ℃ ‑ Relative humidity: 5%‑95% non‑condensing ‑ Installation location: Indoor control cabinet, IP20 protection class ‑ EMC compliance: IEC 61000‑6‑2 ‑ Certifications: CE, UL Class I Div 2 hazardous‑location certification

Mechanical Data

‑ Weight: approx 0.70 kg ‑ Dimension: Series 90‑70 standard single‑slot module form‑factor

Main Functions

1. Acts as main‑rack master for Series 90‑70 remote expansion bus, communicates with IC697BEM731 modules located in remote racks, extends PLC I/O points without adding slots in main CPU rack.
2. Parallel high‑speed bus ensures fast refresh of digital and analog I/O located in distributed remote racks.
3. Comprehensive link diagnostics to detect broken cable, remote rack power‑loss and communication parity errors.
4. Front‑panel LED indicators:   ‑ Green OK: Module self‑test passed   ‑ Red FAULT: Hardware / configuration / remote‑link fault   ‑ XMIT: Expansion‑bus transmit activity   ‑ RECV: Expansion‑bus receive activity

Installation & Wiring Requirements

1. Power‑off entire rack before installation or replacement. Hot‑swap is not allowed. Apply ESD protection during module handling.
2. Insert IC697BEM721 into free slot of Series 90‑70 main‑rack backplane and fasten module latch. Connect qualified 50‑pin parallel expansion bus cable between BEM721 and remote‑rack IC697BEM731 modules.
3. Cable installation comply with manual GFK‑0366. Separate expansion bus cables from high‑power high‑voltage wiring. Reliable protective‑ground connection is mandatory.
4. After replacement: Power‑on rack power, check front‑panel LED indicators. Download hardware configuration, define remote‑rack slot layout. Verify all I/O signals from every remote expansion rack. Simulate cable disconnection to check fault‑reporting behavior.
5. Replacement note: Confirm total main‑rack backplane power budget. Check 50‑pin cable integrity and pin definition. Full‑system commissioning test is mandatory before putting into service.