Product Overview
When a SLC 500 line goes down because the programming link fails, every minute of downtime costs money. The Allen-Bradley 1747-C20 is the programming and communication cable built for exactly that situation. This 6.09-meter (20-foot) cable connects SLC 500 controllers to the devices engineers rely on every day, and it does so with a clip-on connector that stays put in busy panels.
Unlike generic cables, the 1747-C20 supports the DH-485 communication protocol and carries a 1500V DC isolation rating. That combination protects connected hardware from electrical faults while keeping data moving between controllers and peripherals.
Technical Specifications
| Specification | Value |
|---|---|
| Manufacturer | Allen-Bradley |
| Series | SLC 500 |
| Part Number | 1747-C20 |
| Product Type | Programming/Communication Cable |
| Cable Length | 6.09 m (20 ft) |
| Communication Protocol | DH-485 |
| Isolation Voltage | 1500V DC |
| Connector Type | Clip-on |
| EMI Protection | Yes |
| Supported Controller | SLC 500 controllers |
| Supported Accessories | 1747-AIC, 1747-PIC, 1747-DTAM-E |
Why the 20-Foot Length Matters
Panel layouts rarely cooperate. A 6.09-meter cable gives technicians room to reach controllers mounted deep in a cabinet or across a skid without adding extension adapters. That extra reach reduces strain on connectors and makes temporary programming sessions faster to set up.
Integration with SLC 500 Accessories
The 1747-C20 works with the 1747-AIC Isolated Link Coupler, the 1747-PIC Personal Interface Converter, and the 1747-DTAM-E Data Table Access Module. In practice, this means one cable can serve several roles: linking a PC for programming, connecting a data access module for on-floor monitoring, or tying into an isolated network segment through the AIC.
Integration Note
When wiring into a DH-485 network, confirm cable routing and any gateway or connection module requirements with your supplier. Oil AutoTech can help verify the right setup for your SLC 500 architecture.
Applications Across Oil, Gas, and Industrial Automation
In oil and gas facilities, SLC 500 controllers often sit in remote pump stations or compressor buildings. The 1747-C20’s 20-foot length and EMI protection suit these electrically noisy environments, where reliable programming access matters during commissioning and troubleshooting.
On manufacturing lines, the same cable supports quick changeovers. A technician can connect a laptop, update logic, and disconnect without disturbing adjacent wiring. The clip-on connector speeds this process compared with screw-terminal alternatives.
Water treatment plants also rely on SLC 500 systems for pump control and monitoring. Here, the 1500V DC isolation rating adds a layer of protection when the cable runs near variable-frequency drives or other high-energy equipment.
Maintenance and Reliability
Inspect the 1747-C20 periodically for cuts, crushed sections, or bent connector pins. Because the clip-on connector relies on a secure mechanical fit, check that it seats firmly before each programming session. Store the cable coiled at a safe bend radius to prevent internal conductor damage.
EMI protection helps maintain signal integrity, but routing the cable away from drives and power feeders still improves performance. If communication errors appear, swap in a known-good cable first — it is the fastest way to isolate the fault.
Selection Checklist
Before ordering, confirm your controller is an SLC 500 model and that your communication path uses DH-485. Verify whether you need the 1747-AIC, 1747-PIC, or 1747-DTAM-E in the same link. If you are unsure, contact Oil AutoTech today for pricing and availability. We provide hands-on technical selection help and fast dispatch, worldwide.
Please verify current lifecycle status and availability with Oil AutoTech before ordering.
