Allen-Bradley SLC 500 Modules: 1747-AENTR

Name: Allen-Bradley SLC 500 Modules: 1747-AENTR
Brand: Allen-Bradley

Model: 1747-AENTR

Brand Allen-Bradley

Series SLC 500

Model 1747-AENTR

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Product Details And Specifications

Allen-Bradley SLC 500 Series Technical Notes

The Evolution of SLC 500 Architecture

The SLC 500 platform was introduced in 1991 as a successor to the SLC 100 and SLC 150 fixed-format controllers. The original 1747-L511 and 1747-L514 processors used a proprietary DH-485 serial network for peer-to-peer communication. The 1747-L532 and 1747-L541 mid-range processors introduced expanded data table capacity and support for the Data Highway Plus (DH+) protocol via the 1747-KE or 1747-KFC15 communication interface modules.

The third-generation processors—1747-L551, 1747-L552, and 1747-L553—added native DH+ port integration and expanded program memory to 64K words. The introduction of the 1747-AENTR EtherNet/IP adapter in the 2000s marked the platform's integration into modern Ethernet-based control architectures, allowing SLC 500 racks to participate in Logix-based EtherNet/IP networks without processor replacement. This bridging capability extended the operational life of legacy installations by a decade or more.

Rockwell Automation announced end-of-life for the SLC 500 processor family in 2012, with last-time-buy periods concluding by 2015. The recommended migration path is to the Allen-Bradley MicroLogix 1500 or CompactLogix L3x series. However, due to the cost and complexity of full system migration in continuous-process industries, the SLC 500 platform remains in production service at a significant proportion of installed sites.

SLC 500 Full Catalog & Functionalities (SKU List)

CPU / Processor Modules

1747-L511: SLC 5/01 processor, 1K user memory, DH-485 port, fixed I/O chassis only.
1747-L514: SLC 5/01 processor, 4K user memory, DH-485 port, modular chassis compatible.
1747-L524: SLC 5/02 processor, 4K user memory, DH-485 port, enhanced instruction set.
1747-L532: SLC 5/03 processor, 8K user memory, DH-485 and RS-232 ports, online editing.
1747-L541: SLC 5/04 processor, 16K user memory, DH+ and DH-485 ports, high-speed counter.
1747-L551: SLC 5/05 processor, 16K user memory, EtherNet/IP and DH-485 ports, web server.
1747-L552: SLC 5/05 processor, 32K user memory, EtherNet/IP and DH-485 ports.
1747-L553: SLC 5/05 processor, 64K user memory, EtherNet/IP and DH-485 ports, maximum capacity.

Communication Adapter & Interface Modules

1747-AENTR: EtherNet/IP adapter for SLC 500 remote I/O racks; bridges legacy 1746 I/O to EtherNet/IP scanner networks.
1747-SDN: DeviceNet scanner module; manages up to 64 DeviceNet nodes from SLC 500 rack.
1747-KE: RS-232/DH-485 interface module; connects SLC 500 to DH-485 network segments.
1747-KFC15: ControlNet/DH+ bridge module; integrates SLC 500 into ControlNet topologies.
1747-ASB: Remote I/O adapter; connects 1746 I/O chassis as remote rack on Allen-Bradley RIO network.

Digital Input Modules (1746 Series)

1746-IB16: 16-point 24VDC sinking digital input module.
1746-IB32: 32-point 24VDC sinking digital input module, high-density.
1746-IA16: 16-point 120VAC digital input module.

Digital Output Modules (1746 Series)

1746-OB16: 16-point 24VDC sourcing digital output module.
1746-OW16: 16-point relay output module, 10–265VAC/VDC, isolated contacts.
1746-OA16: 16-point 120/240VAC triac output module.

Analog I/O Modules (1746 Series)

1746-NI4: 4-channel analog input module; 4–20mA / 0–10V selectable per channel.
1746-NO4I: 4-channel isolated analog output module; 4–20mA current output.

Power Supply Modules (1746 Series)

1746-P2: 5VDC/2A and 24VDC/0.46A power supply for 4- or 7-slot chassis.
1746-P4: 5VDC/10A and 24VDC/2A power supply for 10- or 13-slot chassis.
1746-P7: 24VDC input power supply; 5VDC/10A output for DC-powered installations.

Quality Control for the SLC 500 Range

SLC 500 modules present specific test challenges due to their backplane communication architecture. The 1746 chassis backplane operates at a proprietary parallel bus protocol; any module with degraded backplane interface logic will pass basic power-on tests but fail under live scan cycle conditions. DriveKNMS applies the following test protocol to all SLC 500 modules prior to shipment:

Backplane continuity and impedance verification using a 1746-A10 test chassis.
Full processor scan cycle test: module inserted into active SLC 5/05 rack running a live ladder logic program with forced I/O verification.
For communication modules (1747-AENTR, 1747-SDN, 1747-ASB): EtherNet/IP, DeviceNet, and RIO network enumeration tests confirming correct node address assignment and data table mapping.
Analog module calibration check: all 1746-NI4 and 1746-NO4I units verified against NIST-traceable reference signals at 0%, 50%, and 100% of rated range.
Thermal cycling: modules operated at 55°C for 2 hours to screen latent component failures.
Final inspection: firmware revision logged, label integrity confirmed, connector pins inspected under 10× magnification.

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