Allen-Bradley 1747-ACN15 ControlNet Adapter Module – SLC 500 Single-Port I/O Adapter

The Allen-Bradley 1747-ACN15 is a single-port ControlNet adapter module designed for the SLC 500 programmable controller family. As an I/O adapter, the 1747-ACN15 enables a remote 1746 I/O chassis to communicate with an SLC 500 processor over a ControlNet network, effectively extending the controller’s reach to distributed I/O locations without the limitations of traditional hardwired remote I/O systems. The module occupies slot 0 of the remote chassis and interfaces with a 1747-SCNR ControlNet scanner installed in the main processor chassis, creating a scanner-to-adapter communication link that the processor uses to exchange I/O data with remote modules .

The 1747-ACN15 features a single BNC connector for non-redundant ControlNet media operation, making it distinct from its sibling model 1747-ACNR15, which provides dual BNC connectors for redundant media applications . The module also includes a Network Access Port (NAP), an RJ-45 style connector that allows local configuration and programming access without requiring a direct connection to the ControlNet trunk. Front-panel diagnostics include CHA and OK LED indicators plus a 7-segment alphanumeric display that reports node addresses, active status, and error codes during initialization or operation .

The 1747-ACN15 was discontinued by Rockwell Automation on December 31, 2014, but remains in demand for maintaining existing SLC 500 installations that rely on ControlNet for remote I/O communication . Facilities operating legacy SLC 500 systems should maintain spare inventory of the 1747-ACN15 to avoid extended downtime in the event of adapter failure.

Category: A-B

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Description

Technical Specifications

Parameter Name	Parameter Value
Product Model	1747-ACN15
Manufacturer	Allen-Bradley (Rockwell Automation)
Product Type	ControlNet I/O Adapter Module
Product Line	SLC 500
ControlNet Ports	1 BNC (non-redundant media)
Network Access Port	1 NAP (RJ-45, 8-pin shielded)
Communication Rate	5 Mbps
Backplane Current Load	900 mA @ 5V DC
Power Dissipation	5 Watts
Thermal Dissipation	17.06 BTU/Hr
ControlNet Cable	Quad-Shield RG-6 Coaxial (1786-RG6)
Compatible Taps	1786-TPR, 1786-TPS, 1786-TPYR, 1786-TPYS
Status Indicators	CHA LED, OK LED, 7-Segment Display
Operating Temperature	0°C to +60°C
Module Location	Slot 0 of 1746 I/O chassis
Weight	0.43 kg (0.94 lbs)
Status	Discontinued (December 31, 2014)

Main Features and Advantages

Remote I/O Chassis Integration: The 1747-ACN15 transforms a standard 1746 I/O chassis into a ControlNet-connected remote I/O station. When paired with a 1747-SCNR scanner in the main processor chassis, the 1747-ACN15 enables the SLC 500 processor to read inputs from and write outputs to modules located up to thousands of feet away over a single coaxial cable, dramatically reducing wiring costs compared to traditional point-to-point remote I/O .

Non-Redundant Media Simplicity: With a single BNC connector, the 1747-ACN15 supports standard non-redundant ControlNet media operation. This configuration is appropriate for applications where network redundancy is not required, offering a simpler and more cost-effective solution than the redundant 1747-ACNR15 variant. The single-channel design reduces cabling complexity and eliminates the need for media redundancy management .

Local Configuration via NAP Port: The Network Access Port on the 1747-ACN15 allows technicians to connect a programming terminal directly to the adapter for local configuration, diagnostics, and troubleshooting. Using a 1786-CP cable and a 1784-KTC or 1784-KTCX card (or a 1770-KFC bridge), network configuration and adapter parameter changes can be performed without accessing the main ControlNet trunk .

Comprehensive Diagnostic Display: The 1747-ACN15 provides both LED indicators and a 7-segment alphanumeric display for status reporting. The CHA LED indicates the communication link between adapter and scanner, while the OK LED reports overall module health. The 7-segment display shows the module’s node address, “ACTV” during active communication, and error codes during fault conditions, enabling rapid field diagnosis without external test equipment .