ProSoft PLX51-DF1-ENI – DF1 Serial to EtherNet/IP Routing Module | PLX51 Platform
Engineering Background
Legacy Allen-Bradley DF1 serial networks remain deeply embedded in process-control and discrete-manufacturing environments worldwide. Replacing field devices is costly and operationally disruptive. The PLX51-DF1-ENI was engineered specifically to bridge that gap—translating DF1 half-duplex or full-duplex serial traffic into native EtherNet/IP messaging without requiring PLC program changes or hardware replacement.
Product Positioning
The PLX51-DF1-ENI is the preferred routing solution for engineers who need to integrate legacy SLC 500, MicroLogix, or PLC-5 DF1 devices into modern Logix-based EtherNet/IP architectures. It mounts on a standard DIN rail alongside CompactLogix or ControlLogix backplanes and is configured entirely through ProSoft Configuration Builder (PCB)—no ladder logic required.
Complete Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | PLX51-DF1-ENI |
| Manufacturer | ProSoft Technology |
| Protocol – Port 1 (Serial) | DF1 Full-Duplex / Half-Duplex (RS-232 / RS-485) |
| Protocol – Port 2 (Ethernet) | EtherNet/IP (CIP) – Explicit Messaging & I/O |
| Serial Baud Rate | 1,200 – 115,200 bps |
| Serial Connector | DB-9 (RS-232) / Terminal Block (RS-485) |
| Ethernet Port | 10/100 Mbps, RJ-45, auto-negotiate |
| EtherNet/IP Connections | Up to 32 simultaneous CIP connections |
| Power Supply | 24 VDC (±10%), 150 mA typical |
| Operating Temperature | 0 °C to +60 °C (32 °F to 140 °F) |
| Storage Temperature | -40 °C to +85 °C |
| Relative Humidity | 5 – 95% non-condensing |
| Mounting | 35 mm DIN rail |
| Dimensions (H × W × D) | ~100 × 40 × 80 mm |
| Certifications | CE, UL Listed, RoHS compliant |
| Configuration Tool | ProSoft Configuration Builder (PCB) – free download |
| Firmware Update | Via Ethernet (TFTP) |
Proven Application Environments
- Legacy SLC 500 / MicroLogix integration – Expose DF1 slave devices as EtherNet/IP targets readable by Studio 5000 / RSLogix 5000 programs.
- PLC-5 migration projects – Retain existing DF1 field wiring while migrating the host controller to a ControlLogix platform.
- SCADA / HMI connectivity – Allow FactoryTalk View, Ignition, or third-party SCADA systems to poll DF1 devices over Ethernet.
- Remote I/O bridging – Connect remote DF1 serial panels to a central EtherNet/IP network backbone.
- Oil & gas, water/wastewater, food & beverage – Suitable for industrial environments requiring 24/7 uptime and wide temperature tolerance.
Engineering Advantages
- Zero PLC code changes – The module handles all protocol translation transparently; existing ladder logic runs unmodified.
- Dual-port flexibility – RS-232 and RS-485 support covers point-to-point and multi-drop DF1 topologies.
- Up to 32 CIP connections – Supports multiple simultaneous Logix controllers or SCADA clients polling the same DF1 device.
- DIN-rail form factor – Compact footprint integrates cleanly into existing panel layouts without backplane slot consumption.
- Free configuration software – ProSoft Configuration Builder requires no license fee and provides diagnostic live-data views.
- Proven field reliability – PLX51 platform deployed in thousands of installations across North America, Europe, and Asia-Pacific.
System Architecture & Signal Flow
The PLX51-DF1-ENI operates as an EtherNet/IP adapter (server) on the Ethernet side and a DF1 master or slave on the serial side, depending on configuration mode:
- Pass-Through Mode – An EtherNet/IP scanner (e.g., ControlLogix) sends CIP explicit messages; the module converts them to DF1 commands and forwards responses back as CIP reply data.
- Data Mirror Mode – The module autonomously polls DF1 devices on a configurable scan rate and mirrors register data into an internal data table accessible via EtherNet/IP I/O or explicit messaging.
Configuration is performed offline in PCB, then downloaded to the module over Ethernet. LED indicators (PWR, STS, TX, RX, LNK) provide real-time diagnostic feedback without requiring a laptop on-site.
Sourcing & Quality Verification
- OEM-traceable supply chain – All PLX51-DF1-ENI units sourced through authorized ProSoft Technology distribution channels.
- Pre-shipment inspection – Each unit undergoes power-on functional verification and firmware version confirmation before dispatch.
- Authentic labeling – Genuine ProSoft holographic labels, serial numbers, and CE/UL markings verified against manufacturer records.
- Warranty – ProSoft Technology standard limited warranty applies; Konmask provides 90-day return-to-base support.
Procurement Process
- Submit RFQ – Email [email protected] with quantity, required delivery date, and destination country.
- Receive quotation – Formal quotation with unit price, lead time, and shipping options issued within 1 business day.
- Order confirmation – Purchase order accepted via email; proforma invoice issued for prepayment or net-terms accounts.
- Shipment & tracking – Units shipped via DHL / FedEx with full tracking; export documentation (commercial invoice, packing list, COO) provided.
- Post-delivery support – Technical commissioning support available via email or video call at no additional charge.
Technical FAQ
Q: Can the PLX51-DF1-ENI act as a DF1 master to poll multiple slave devices?
A: Yes. In Data Mirror Mode the module acts as DF1 master and can poll multiple slave node addresses sequentially.
Q: Is the module compatible with RSLinx Classic for DF1 pass-through?
A: Yes. RSLinx Classic can use the EtherNet/IP driver to reach DF1 devices through the PLX51-DF1-ENI as if connected via a direct serial cable.
Q: What is the maximum cable length for RS-485 DF1?
A: RS-485 supports up to 1,200 m (4,000 ft) at lower baud rates with proper termination and shielded cable.
Q: Does the module require a Logix backplane slot?
A: No. It is a standalone DIN-rail device powered by 24 VDC; no backplane slot is consumed.
Q: Can firmware be updated in the field?
A: Yes, via TFTP over the Ethernet port using ProSoft Configuration Builder.
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