Allen-Bradley 1747-AIC/B Isolated Link Coupler Module

Configured for DH-485 network interface coupling in SLC 500 systems, the Allen-Bradley 1747-AIC/B, (1747-AIC/B isolated link coupler module) provides direct physical/electrical execution of communication isolation and node interconnection across SLC 500 DH-485 network segments.

Suffix Breakdown & Model Matrix

The 1747-AIC/B designation is treated as a single functional part number within the SLC 500 DH-485 communication accessory family. No additional hardware or option suffix segmentation is defined.

Hardware Specifications

DH-485 Link Isolation and Communication Path Control

The module implements galvanic isolation between the DH-485 communication line and connected SLC 500 devices. Signal coupling is executed through isolated transceiver stages, separating network potential from controller logic reference. The DH-485 bus arbitration layer operates in half-duplex or full-duplex compatible modes depending on connected node configuration, with link buffering handled at the coupler interface. Isolation structure limits transient propagation from field communication wiring into backplane-connected equipment.

Frequently Asked Questions

Q: Does the 1747-AIC/B support direct backplane communication with SLC 500 processors?
A: No. The module functions as a DH-485 link coupler and does not participate in backplane data execution or I/O scanning.

Q: What isolation barrier is implemented in the module?
A: The module provides 1500 VDC isolation between the DH-485 communication line and connected device circuitry.

Q: Can the module operate without an external 24 VDC supply?
A: No. The unit requires an external 24 VDC supply for communication interface operation.

Field Installation Guidelines

• Mount the module in accordance with SLC 500 chassis accessory placement rules.

• Verify 24 VDC external supply polarity before energizing the coupler.

• Maintain separation between DH-485 wiring and high-voltage conductors to reduce induced coupling.

• Use twisted-pair shielded cable for DH-485 signal routing.

• Terminate cable shield at a single ground reference point to avoid ground loop current paths.

• Confirm node addressing and network termination before system commissioning.