GE Fanuc IC697BEM711N Series 90-70 Bus Receiver Module

Configured for high-speed parallel rack expansion in Series 90-70 PLC chassis, the GE Fanuc IC697BEM711N (IC697BEM711 Bus Receiver Module) provides direct physical/electrical execution of expansion bus signals between the local CPU rack and peripheral I/O racks.

Hardware Specifications

Backplane Bus Communication & Series 90-70 Determinism

The IC697BEM711 module connects directly to the VME standard C.1 backplane, serving as the interface node for extended backplane architecture. Designed to sustain high backplane bus communication velocity across expanded rack layouts, the module coordinates differential data transfer at a rate of 500 Kbytes/sec across daisy-chained configurations.

I/O density scaling relies on precise rack addressing established via hardware jumper settings on the baseplate, maintaining bus frame timings across all expanded racks. Data transferred through the two 25-pin D-shell connectors uses non-isolated differential signaling to prevent transmission delays across the 15-meter physical cable limit. The interface logic automatically routes parallel logic lines, allowing distant I/O expansion racks to mirror local CPU updates without introducing firmware latency.

Frequently Asked Questions

Q: What are the backplane power restrictions and hot-swap limitations during maintenance?

A: System power must be fully switched off before inserting or removing the IC697BEM711 card from the slot. The module draws a constant 800 mA at 5 VDC directly from the rack backplane power supply, and live insertion disrupts the shared parallel backplane bus lines.

Q: How is physical line termination applied to the expansion network?

A: The final expansion rack in the daisy chain must have an IC697ACC702 terminator plug connected to its outbound 25-pin D-shell port. This matching termination eliminates signal reflection on the high-speed differential lines and lights the "Last Rack" LED indicator on the final module.

Field Installation Guidelines

1. Power Off Verification: Ensure all main AC power and 24 VDC field power to the Series 90-70 baseplate are isolated before placing the module into Slot 1 of the expansion chassis.
2. Baseplate Jumper Setting: Set the rack address DIP switches or jumpers on the receiving baseplate backplane prior to card insertion to ensure correct address decoding by the CPU.
3. Module Seating: Align the IC697BEM711 circuit board with the top and bottom card guides of Slot 1. Slide the module firm back until the backplane connectors snap completely into place, then secure the top and bottom retaining screws.
4. Cabling and Shield Termination: Attach pre-fabricated expansion cables (IC600WD series) to the 25-pin D-shell connectors. Port 1 must face upstream toward the CPU or preceding BEM module, and Port 2 must face downstream toward the next expansion rack. Ensure the cable connector screws are tightened to secure ground connection for the cable shields.
5. Terminating Resistor Attachment: If the module is designated as the terminal point in the expansion sequence, insert the IC697ACC702 terminator plug into Port 2 to properly balance line impedance.