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Allen-Bradley 1747-KE SLC 500 Communication Interface Module
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- Part Number: 1747-KE
- Brand: Allen-Bradley
- Type: Interface Modules
- Barcode: USA
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Product Description
Configured for DH-485 and DF1 protocol conversion in SLC 500 rack assemblies, the Allen-Bradley 1747-KE (1747-KE Communication Interface Module) provides direct physical/electrical execution of serial data routing and network bridging across control automation loops.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Brand | Allen-Bradley |
| Model | 1747-KE |
| Origin | USA |
| Weight | 0.68 kg (1.50 lbs) |
| Dimensions | Single-slot SLC 500 chassis footprint |
| Operating Temp | 0 to 60 deg C (32 to 140 deg F) |
| Power Consumption | 150 mA at 5 VDC, 40 mA at 24 VDC backplane current |
| Number of Ports | 3 ports (1 Configuration, 1 DF1, 1 DH-485) |
| Supported Protocols | DH-485, DF1 |
| Physical Interfaces | RS-232, RS-423, RS-422, RS-485 |
| Transmission Speed | 300 to 19200 bps |
| Port Isolation | 500 VDC (Backplane-to-CONFIG, Backplane-to-DF1, CONFIG-to-DF1) |
| Real-Time Clock Accuracy | +/-1 min/month at 25 deg C; +0, -6 min/month at 60 deg C |
| Humidity & Vibration | 5 to 95% non-condensing; 2.5 G at 57 to 2000 Hz |
| Operating Shock | 30 G |
| Hazardous Location Rating | UL/c-UL listed Class I Div 2 Groups A, B, C, D; CE; C-Tick |
| Slot Width | 1 slot |
Deterministic Backplane & Network Interoperability
The 1747-KE establishes bidirectional protocol translation between DH-485 serial networks and DF1 full/half-duplex communication loops. Backplane bus communication velocity allows seamless transmission of process data tables and register structures directly into host SLC processor image files without disrupting cyclic scan times. Internal hardware switches and jumper configurations enable deterministic baud rate negotiation (up to 19200 bps), while isolated channel architecture isolates serial transceiver stages to maintain bus stability across long-distance copper links in high-density I/O installations.
Frequently Asked Questions
Q: What galvanic isolation boundaries are present across the 1747-KE module interfaces?
A: The module incorporates 500 VDC galvanic isolation between the backplane bus and the CONFIG port, between the backplane bus and the DF1 port, and between the CONFIG and DF1 ports. The DH-485 port does not feature internal isolation.
Q: What are the backplane power supply current requirements for module operation?
A: The module draws 150 mA from the 5 VDC backplane rail and 40 mA from the 24 VDC backplane rail. System power supply sizing calculations must account for both backplane current ratings.
Q: How are internal physical hardware protocols selected for the CONFIG and DF1 ports?
A: Hardware options for RS-232, RS-423, RS-422, and RS-485 electrical interface standards are selected using internal printed circuit board jumper settings (JW1 for CONFIG, JW2 for DF1, and JW4 for operating mode).
Field Installation Guidelines
Ensure main power to the SLC 500 chassis is completely turned off before installing or removing the module. Wait at least 10 seconds for power supply bus capacitors to discharge completely prior to inserting the circuit board into the designated rack slot.
Use shielded Belden 9463 twinaxial cable for DH-485 network runs, wiring to the 6-pin Phoenix terminal connector. Connect serial communication cabling for DF1 and CONFIG channels using standard 9-pin Sub-D connectors. Maintain physical separation between serial signal runs and AC power lines inside electrical control cabinets. Land shielding drain wires strictly at a single enclosure protective ground lug to prevent ground loops.
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