Isolated Link Coupler | Allen-Bradley 1747-AIC
The 1747-AIC isolated link coupler is a hardware interface device designed for Allen-Bradley SLC 500 programmable logic controller networks. It connects devices utilizing the DH-485 communication protocol, providing electrical isolation to protect connected nodes from ground loops, electrical noise, and transient voltage surges on industrial shop floors.
Communication and Isolation Function
This coupler links multiple DH-485 nodes, such as SLC 500 processors, PanelView terminals, and programming PCs, onto a shared communication trunkline. The internal optical and galvanic isolation barriers safeguard sensitive controller communication ports from common-mode voltage differences between remote equipment racks.
Power Requirements and Cabling
The module requires an external 24 VDC power supply connected to its terminal block to operate the isolation circuitry and transceiver drivers. It features dual RJ45 communication ports and a removable screw-clamp terminal strip, allowing straightforward daisy-chain wiring topologies across standard Belden communication cables.
| Parameter | Specification |
|---|---|
| Model | 1747-AIC |
| Brand | Allen-Bradley (Rockwell Automation) |
| Product Type | Isolated Link Coupler |
| Product Family | SLC 500 |
| Network Protocol | DH-485 Network |
| Power Supply | 24 VDC External Power Required |
| Weight | 0.71 lbs (approx. 0.32 kg) |
Frequently Asked Questions
Q: Does the 1747-AIC draw power directly from the DH-485 network cable? A: No. The unit requires a dedicated external 24 VDC power source wired to its terminal block to function and power the isolation barriers.
Q: What is the primary purpose of the isolation feature on this coupler? A: It protects controller communication ports and prevents data corruption by breaking electrical ground loops and blocking voltage transients between distributed network nodes.
Isolated Link Coupler | Allen-Bradley 1747-AIC
Isolated Link Coupler | Allen-Bradley 1747-AIC
The 1747-AIC isolated link coupler is a hardware interface device designed for Allen-Bradley SLC 500 programmable logic controller networks. It connects devices utilizing the DH-485 communication protocol, providing electrical isolation to protect connected nodes from ground loops, electrical noise, and transient voltage surges on industrial shop floors.
Communication and Isolation Function
This coupler links multiple DH-485 nodes, such as SLC 500 processors, PanelView terminals, and programming PCs, onto a shared communication trunkline. The internal optical and galvanic isolation barriers safeguard sensitive controller communication ports from common-mode voltage differences between remote equipment racks.
Power Requirements and Cabling
The module requires an external 24 VDC power supply connected to its terminal block to operate the isolation circuitry and transceiver drivers. It features dual RJ45 communication ports and a removable screw-clamp terminal strip, allowing straightforward daisy-chain wiring topologies across standard Belden communication cables.
| Parameter | Specification |
|---|---|
| Model | 1747-AIC |
| Brand | Allen-Bradley (Rockwell Automation) |
| Product Type | Isolated Link Coupler |
| Product Family | SLC 500 |
| Network Protocol | DH-485 Network |
| Power Supply | 24 VDC External Power Required |
| Weight | 0.71 lbs (approx. 0.32 kg) |
Frequently Asked Questions
Q: Does the 1747-AIC draw power directly from the DH-485 network cable? A: No. The unit requires a dedicated external 24 VDC power source wired to its terminal block to function and power the isolation barriers.
Q: What is the primary purpose of the isolation feature on this coupler? A: It protects controller communication ports and prevents data corruption by breaking electrical ground loops and blocking voltage transients between distributed network nodes.
