The GE 8709-CA-08, also cataloged as the 8709-CA-08 8-Slot I/O Carrier, operates as a dedicated hardware component for physical module mounting and backplane signal interconnection within PAC8000 systems.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 8709-CA-08 |
| Brand | GE |
| Origin | United States |
| Weight | 0.680 kg |
| Dimensions | 342 mm x 170 mm x 22 mm |
| Operating Temp | -40 to 70 deg C |
| Power Consumption | Passive carrier chassis (Two 8-pin bussed field power connectors) |
| Module Capacity | Supports up to 8 PAC8000 I/O modules |
| Address Bus Range | Module addresses 1 to 64 |
| Railbus Connectors | Female input, male output |
| Field Terminals | Accepts standard PAC8000 snap-on terminals |
| Earthing Bar | Isolated bar for cable screens and shields |
| Mounting Options | DIN rail (EN 50022 or EN 50035) or flat panel |
| Base Material | Poly-phenylene oxide moulding with epoxy resin woven glass laminate PCB |
Backplane Bus Communication Velocity & Network Integrity
The 8709-CA-08 8-slot I/O carrier maintains steady backplane bus communication velocity through integrated female input and male output railbus connectors. Constructing low-latency physical backplane links across contiguous carrier units guarantees deterministic signal propagation across the address bus range (1 to 64). The structural layout prevents frame drops and signal attenuation, providing consistent firmware flash compatibility for active I/O cards inserted across all 8 slots.
Frequently Asked Questions
Q: Can multiple 8709-CA-08 carriers be daisy-chained along a single DIN rail node?
A: Yes. The carrier utilizes integrated female input and male output railbus connectors on opposite ends to form a continuous backplane data and power bus across adjacent units.
Q: How is shield grounding handled for field cables terminated on the 8709-CA-08 carrier?
A: The carrier features an integrated, isolated earthing bar specifically designated for clamping and grounding individual field cable screens and braid shields.
Q: Are special tools required to secure field wiring terminals onto the carrier base?
A: No. The board geometry accepts standard PAC8000 snap-on field terminal blocks that lock mechanically onto the carrier frame without requiring extra hardware.
Field Installation Guidelines
- De-energize all system field power supplies and railbus node power prior to installing or removing the 8709-CA-08 carrier.
- Secure the carrier base onto EN 50022/EN 50035 DIN rails or mount directly onto a flat panel using appropriate fixing hardware.
- Push adjacent carrier modules together horizontally until the female input and male output railbus connectors mate completely.
- Connect field wiring cable shields directly to the isolated earthing bar to ensure proper high-frequency noise rejection.
- Verify that the bussed field power 8-pin connectors are locked and correctly aligned to prevent voltage drops across the module slots.
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