Allen-Bradley 1747-CP3 – RS-232 to DH-485 Programming Cable | SLC 500 Platform
Engineering Background
The Allen-Bradley 1747-CP3 (catalog number 1747-CP3) is a factory-original programming cable designed by Rockwell Automation for direct PC-to-PLC communication on the SLC 500 and MicroLogix control platforms. It bridges the standard RS-232 serial port of a programming workstation to the DH-485 network port on the SLC processor, enabling RSLogix 500 and RSLinx Classic software to establish a reliable programming and monitoring session without requiring a separate communication module.
Product Positioning
Targeted at OEM machine builders, system integrators, and plant maintenance engineers, the 1747-CP3 is the lowest-cost, lowest-latency path to program, upload/download, and go online with SLC 5/03, 5/04, 5/05, and the full MicroLogix family. It eliminates the need for an Ethernet or ControlNet bridge when a direct serial connection is sufficient for the task.
Complete Technical Specifications
| Parameter | Specification |
|---|---|
| Catalog Number | 1747-CP3 |
| Manufacturer | Rockwell Automation / Allen-Bradley |
| Series / Platform | SLC 500 / MicroLogix |
| Cable Function | Programming & Monitoring Cable |
| PC Interface | RS-232 (DB-9 Male) |
| PLC Interface | DH-485 (Mini-DIN 8-pin) |
| Protocol | DH-485 (Data Highway 485) |
| Baud Rate | Up to 19,200 bps |
| Cable Length | ~2 m (6.5 ft) nominal |
| Compatible Software | RSLogix 500, RSLinx Classic, Studio 5000 (via RSLinx) |
| Compatible PLCs | SLC 5/03, SLC 5/04, SLC 5/05, MicroLogix 1000/1100/1200/1400/1500 |
| Operating Temperature | 0 °C to 60 °C (32 °F to 140 °F) |
| Weight | ~350 g |
| Country of Origin | United States |
Proven Application Environments
- Discrete Manufacturing: Automotive assembly lines, conveyor control, and machine tool integration using SLC 5/04 processors.
- Process Control: Batch sequencing and analog loop tuning on SLC 5/05 with RSLogix 500 online monitoring.
- Building Automation: HVAC and access-control panels running MicroLogix 1200/1400 requiring periodic firmware updates.
- Field Service & Commissioning: Laptop-based programming sessions during machine startup, eliminating the need for a network infrastructure.
- Legacy System Maintenance: Sustaining engineering teams maintaining installed SLC 500 fleets without migrating to Ethernet-based communication.
Engineering Advantages
- Zero-Configuration Setup: Plug-and-play with RSLinx Classic; no driver card or external power supply required.
- Low Latency: Direct point-to-point DH-485 link delivers faster scan-cycle response than bridged Ethernet paths for single-node programming tasks.
- OEM Reliability: Factory-original Rockwell Automation cable with molded connectors and shielded conductors for noise immunity in industrial environments.
- Cost-Effective: Most economical communication path for SLC 500 programming; no additional hardware modules required.
- Wide Compatibility: Single cable supports the entire SLC 500 and MicroLogix product families via the universal DH-485 port.
System Architecture & Signal Flow
The 1747-CP3 implements an RS-232 to DH-485 level-shift circuit within the cable assembly itself. Signal flow is as follows:
- PC RS-232 TX/RX → Internal level-shift IC → DH-485 differential pair (A/B)
- RSLinx Classic auto-detects the COM port and negotiates baud rate (1,200 – 19,200 bps) with the SLC processor.
- The SLC processor responds on the DH-485 bus; RSLogix 500 establishes an online session for programming, forcing, and data monitoring.
- No external power is required; the cable draws logic power from the RS-232 control lines (RTS/DTR).
Note: For multi-node DH-485 networks or USB-only laptops, consider the 1747-UIC (USB to DH-485) adapter as a complementary solution.
Sourcing & Quality Verification
- All units sourced from authorized Rockwell Automation distribution channels or verified surplus with full traceability documentation.
- Each cable undergoes continuity and signal-integrity testing prior to shipment.
- Packaging includes original Rockwell Automation catalog label with date code for authenticity verification.
- Konmask.com maintains a zero-counterfeit policy; all parts are inspected against OEM specifications before listing.
Procurement Process
- Confirm Compatibility: Verify your PLC model (SLC 5/03–5/05 or MicroLogix) and PC COM port type (DB-9 RS-232 or USB-to-serial adapter).
- Request a Quote: Contact support@konmask.com for volume pricing, lead time, and export documentation.
- Place Order: Add to cart and complete checkout; payment via T/T, PayPal, or credit card accepted.
- Shipping: DHL / FedEx express worldwide; typical transit 3–7 business days. Customs documentation provided for cross-border shipments.
- After-Sales Support: 12-month warranty; technical support available via email or WhatsApp.
Technical FAQ
Q: Can I use the 1747-CP3 with a USB port?
A: Not directly. You need a USB-to-RS-232 adapter (e.g., Prolific PL2303 or FTDI-based). Alternatively, use the 1747-UIC for native USB-to-DH-485 connectivity.
Q: Is the 1747-CP3 compatible with SLC 5/01 and 5/02?
A: The SLC 5/01 and 5/02 use a different programming port (RS-232 direct, catalog 1747-CP1). The 1747-CP3 is designed for the DH-485 port found on SLC 5/03 and above.
Q: What RSLinx driver should I select?
A: Select “RS-232 DF1 devices” or “SLC 500 (DH-485)” driver in RSLinx Classic, pointing to the COM port where the cable is connected.
Q: Can this cable be used for online monitoring only (no programming)?
A: Yes. The 1747-CP3 supports full online monitoring, data table editing, and forced I/O in addition to program upload/download.
Q: Do you provide a certificate of conformance (CoC)?
A: Yes, CoC and test reports are available upon request for OEM and system integrator procurement requirements.
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