ProSoft 2150-AGA/1747-KE SLC DF1-DH485 Gateway

Product Overview

ProSoft 2150-AGA/1747-KE SLC DF1-DH485 Gateway: Seamless Upgrade & Legacy System Replacement

The ProSoft Technology 2150-AGA/1747-KE is a dedicated DF1-to-DH-485 communication gateway module engineered for Allen-Bradley SLC 500 control systems. As a direct functional replacement for the discontinued Allen-Bradley 1747-KE, this module bridges DF1 full-duplex or half-duplex serial devices to the DH-485 network without requiring PLC program modifications, making it the preferred solution for engineers managing legacy SLC 5/01, SLC 5/02, SLC 5/03, SLC 5/04, and SLC 5/05 installations that must remain operational while the broader control architecture is modernized.

Industrial facilities running aging SLC 500 racks frequently encounter the challenge of maintaining DH-485 network integrity when the original 1747-KE communication module reaches end-of-life or becomes unavailable through standard distribution channels. The ProSoft 2150-AGA/1747-KE resolves this directly: it occupies the same single-slot SLC 500 chassis position, draws power from the SLC backplane, and presents an identical DH-485 node address configuration interface, allowing field engineers to complete a hot-swap replacement with minimal downtime and no rewiring of the DH-485 trunk cable or drop lines.

For sites migrating from older SCADA or HMI architectures — such as systems using PanelView 550 or PanelView 900 terminals communicating over DH-485 — the 2150-AGA/1747-KE preserves the existing communication path while the HMI layer is upgraded in parallel. Engineers can continue using RSLinx Classic or RSLinx Lite with the DF1 driver on the serial port side, maintaining programming access to the SLC processor via a standard 1747-CP3 or USB-to-serial adapter without disrupting the DH-485 network segment.

Compatibility Comparison Table

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Seamless Upgrade Solutions

A successful SLC 500 communication upgrade rarely involves a single module in isolation. When replacing the 1747-KE with the ProSoft 2150-AGA/1747-KE, field engineers typically audit the surrounding rack and network infrastructure to ensure end-to-end reliability. The 1746-P2 or 1746-P4 SLC 500 power supply module should be verified for adequate current budget, particularly in fully populated chassis where additional communication modules share the backplane load.

On the DH-485 network segment, proper termination is critical. If the existing 1747-AIC Advanced Interface Converter or 1747-AIC+ link coupler is aging or showing intermittent faults, replacing it alongside the gateway module eliminates a common source of network instability during the cutover window. For sites where the DH-485 trunk runs through a control cabinet with multiple SLC racks, the 1747-C13 or 1747-C20 DH-485 cable assemblies should be inspected for shield continuity and connector integrity before commissioning the replacement module.

On the DF1 serial side, if the upstream device is a third-party SCADA server or a ProSoft MVI56-MCM Modbus/DF1 bridge installed in a ControlLogix rack, the serial cable pinout (DB-9 or DB-25, null-modem vs. straight-through) must be confirmed against the 2150-AGA port specification. Many retrofit projects also take this opportunity to introduce a ProSoft AN-X2-AB-DHRIO gateway to simultaneously bridge the DH-485 segment to Ethernet/IP, enabling remote programming access via Studio 5000 or RSLogix 500 without a dedicated serial connection to the rack.

For facilities transitioning HMI hardware in parallel, PanelView Plus 7 terminals with Ethernet/IP connectivity can be introduced alongside the 2150-AGA/1747-KE, allowing the DH-485 network to remain operational for the SLC processors while the new HMI communicates over a separate Ethernet segment. Signal isolation between the DH-485 network and any new Ethernet-based I/O — such as 1734 POINT I/O modules on an EtherNet/IP adapter — is handled at the network layer, requiring no additional signal isolators in most standard installations.

Where the SLC 500 system interfaces with variable frequency drives or servo drives over DF1 serial — for example, legacy PowerFlex 40 or PowerFlex 70 drives configured for RS-232 DF1 communication — the 2150-AGA/1747-KE maintains the existing drive communication parameters, preserving speed reference, fault monitoring, and parameter read/write functions without drive firmware changes.

Retrofit Guidance FAQ

Q: Do I need to modify my SLC 500 ladder logic program after installing the 2150-AGA/1747-KE?
A: No. The module is a transparent protocol gateway. The SLC processor communicates with it via the backplane using the same MSG instruction parameters used with the original 1747-KE. No program changes are required provided the DH-485 node address DIP switches are set identically to the removed module.

Q: Is the DH-485 wiring compatible — can I reuse the existing trunk cable?
A: Yes. The 2150-AGA/1747-KE uses the same 3-wire DH-485 connection (Shield, A, B) on the same terminal block position. No rewiring is required. Verify that the network termination resistors at each end of the DH-485 trunk are intact (typically 120 Ω).

Q: What baud rate should I configure on the DF1 serial port?
A: Match the baud rate of the upstream DF1 device exactly. Common settings are 9600 or 19200 bps. The DIP switch configuration on the 2150-AGA/1747-KE mirrors the 1747-KE layout — refer to the ProSoft User Manual (Document 2150-AGA-UM001) for the switch map.

Q: Can this module coexist with other communication modules in the same SLC 500 chassis?
A: Yes. The 2150-AGA/1747-KE occupies one I/O slot and does not conflict with other modules such as the 1746-BAS BASIC module or additional analog I/O cards. Ensure the chassis power supply current budget accommodates all installed modules.

Q: What is the physical installation space requirement?
A: The module is a standard single-slot SLC 500 form factor. It fits any 1746-Axx chassis slot. No additional DIN rail space or external enclosure is required.

Q: How do I verify the module is communicating correctly after installation?
A: Use RSLinx Classic with the DF1 Serial driver on the serial port to browse the DH-485 network. Confirm that all expected DH-485 nodes appear in the RSWho browser. The module’s LED indicators (TX, RX, NET) provide real-time communication status for both the DF1 and DH-485 ports.

Warranty Assurance

Every ProSoft 2150-AGA/1747-KE unit shipped by TOPNLMS is covered by a 12-month warranty from the date of delivery. Prior to shipment, each module undergoes functional verification including backplane communication testing, DF1 serial port loopback testing, and DH-485 network node enumeration to confirm full operational status.

In the event of a confirmed hardware defect within the warranty period, TOPNLMS provides direct replacement support with priority processing to minimize control system downtime. Our technical team is available to assist with installation verification, DIP switch configuration guidance, and RSLinx driver setup at no additional charge for warranty customers.

Procurement teams can request a test report or inspection certificate prior to shipment. Lead time for in-stock units is typically 1–3 business days from order confirmation, with DHL Express, FedEx International Priority, and sea freight options available depending on urgency and destination.

For volume orders, blanket purchase agreements, and approved vendor qualification documentation, contact our sales team directly.