The Ebyte PN1 series is an industrial-grade PROFINET to Modbus RTU gateway equipped with 4 or 8 isolated RS485 serial ports and dual 10/100M RJ45 switch interfaces, delivering real-time bidirectional data mapping to Siemens S7-1200/1500 PLCs with 4ms cycle times via standard GSDML integration in TIA Portal, featuring 32 commands per port, 3.9Mbps high-speed serial baud rates, DC 8~28V wide voltage input, and conformal coating protection for harsh industrial automation and SCADA systems.
Key Features & Advantages
- Seamless PROFINET RT to Modbus RTU Bidirectional Conversion: Maps downstream Modbus slave device data directly into PLC I/O memory spaces with deterministic communication cycles as fast as 4ms, completely eliminating custom PLC serial communication code.
- High-Density Multi-Port RS485 Architecture (4 or 8 Independent Channels): Available in 4-port (PN1-D41PH) and 8-port (PN1-D81PH) configurations, supporting up to 32 Modbus read/write commands per channel and enabling centralized polling of up to 256 RS485 slave devices.
- Zero-Programming GSDML Integration in TIA Portal & STEP 7: Simply import the official Ebyte GSDML XML device description file into Siemens TIA Portal to configure baud rates, slave IDs, register addresses, and polling intervals visually through modular hardware configuration.
- Industrial-Grade Ruggedness with Conformal Coating & Dual RJ45 Switch: Features integrated dual 10/100M Ethernet ports supporting daisy-chain line topology, wide operating voltage (DC 8~28V with reverse polarity protection), standard 35mm DIN-rail mount, and military-grade conformal coating (anti-mold, anti-moisture, anti-salt spray).
Core Specifications
| Parameter | Specification / Value |
|---|---|
| Fieldbus Protocol | Standard PROFINET Protocol (Real-Time / RT Class 1) |
| Network Interfaces | Dual RJ45 Ethernet Ports (PN1 / PN2), 10/100 Mbps Auto-Negotiation (Built-in Switch) |
| Min PROFINET Cycle Time | Up to 4 ms |
| Serial Channels & Interfaces | 4x RS485 (PN1-D41PH) / 8x RS485 (PN1-D81PH), 5.08mm Industrial Pluggable Screw Terminals |
| Serial Protocol & Baud Rate | Modbus RTU Master Mode, Baud Rate: 1200 ~ 3.9M bps (Customizable parity/stop bits) |
| Command Capacity | Supports up to 32 Modbus commands per RS485 channel (modular GSDML loading) |
| Operating Voltage & Power | DC 8 ~ 28V (Reverse Polarity Protection), Typical Power Consumption: 2 ~ 3 W |
| Termination Resistor | Integrated 120 Ohm matching resistor per port (short-circuit bridgeable R-pin) |
| Environmental Protection | Three-Proof Conformal Coating (Anti-Mold, Anti-Moisture, Anti-Salt Spray) |
| Operating Temperature & Humidity | -40 to +85 deg C, 5% ~ 95% RH (Non-condensing) |
| Mounting & Enclosure | Standard 35mm DIN-Rail, 111 * 40 * 120 mm (L * W * H), Weight: 450 g |
Product Selection Guide
Notice for Selection: Please select between 4-port (PN1-D41PH) and 8-port (PN1-D81PH) models based on the total quantity of RS485 slave instruments and Modbus polling nodes required in your cabinet layout.
| Model SKU | PROFINET Ports | RS485 Channels | Max Modbus Commands | Power Supply | Mounting Method | Dimensions |
|---|---|---|---|---|---|---|
| PN1-D41PH | 2x RJ45 (Cascade Switch) | 4 Channels (Isolated) | 128 Commands (32/port) | DC 8 ~ 28V | 35mm DIN-Rail | 111 * 40 * 120 mm |
| PN1-D81PH | 2x RJ45 (Cascade Switch) | 8 Channels (Isolated) | 256 Commands (32/port) | DC 8 ~ 28V | 35mm DIN-Rail | 111 * 40 * 120 mm |
Industrial Installation & Wiring
The PN1 series is housed in a robust flame-retardant industrial enclosure measuring 111 * 40 * 120 mm with an integrated 35mm standard DIN-rail mounting clip. Dual RJ45 ports (PN1 / PN2) provide 10/100M Ethernet switching to support daisy-chain line topologies without extra external switches. Field serial connections utilize heavy-duty 5.08mm pluggable screw terminals. Each channel provides dedicated RS485 differential signals (A/B/G) and optional internal 120 Ohm termination resistor activation pins (R). Wide DC 8~28V power terminals feature polarity reverse protection.
Practical Application Scenarios
1. Siemens S7 PLC Integration for Factory Automation & CNC Cells
In modern automotive assembly lines and CNC machining plants running Siemens S7-1200 / S7-1500 controllers, legacy frequency inverters, servo drives, and temperature controllers communicate over Modbus RTU. The PN1 gateway seamlessly bridges all serial slave telemetry directly into PLC process image memory (I/Q tags) with deterministic 4ms cycles, enabling unified PLC supervisory control without adding expensive serial communication modules.
2. Power Distribution & Substation Multi-Meter SCADA Data Aggregation
Electrical substations and power distribution cabinets deploy dozens of digital power meters, multi-function relays, and circuit breakers over RS485. Utilizing the 8-channel PN1-D81PH gateway, engineers can segment RS485 buses across independent isolated ports, polling up to 256 Modbus data points simultaneously and streaming real-time voltage, current, and active power metrics up to the PROFINET SCADA dispatch system.
3. Solar Photovoltaic Inverter & Battery Energy Storage (BESS) Monitoring
Utility-scale solar farms and commercial energy storage containers require continuous parameter acquisition from solar string inverters, battery management systems (BMS), and DC combiners. With high-speed 3.9Mbps serial baud rate support, wide DC 8~28V power compatibility, and conformal coating against outdoor condensation, the PN1 gateway ensures uninterrupted energy telemetry in harsh outdoor cabinets.
4. HVAC, Building Automation & Centralized Chiller Plant Control
Commercial building management systems (BMS) integrate multi-brand chillers, variable air volume (VAV) controllers, and air handling units (AHUs). The PN1 gateway aggregates distributed field sensor data and maps damper positions, chilled water temperatures, and flow rates into the master PROFINET PLC architecture, optimizing energy efficiency across entire facility floors.
FAQ Section
1. How do I configure the PN1 gateway in Siemens TIA Portal?
Configuration requires no code programming. Simply import the provided Ebyte GSDML XML file into TIA Portal (Options -> Manage general station description files), drag the PN1 gateway from the hardware catalog into your PROFINET network view, assign a device name/IP, and insert desired modular Modbus read/write command submodules under the device slots.
2. How do I activate the built-in 120 Ohm termination resistor on RS485 ports?
Each RS485 channel features dedicated A, B, R, and G terminals. To enable the onboard high-stability 120 Ohm termination resistor at bus endpoints, simply jumper the R pin and B pin together on the terminal block, eliminating the need for external dangling resistors.
3. Can the dual RJ45 Ethernet ports be used for daisy-chain line topology?
Yes. The PN1 gateway features an integrated two-port Ethernet switch on PN1 and PN2. This allows you to daisy-chain multiple PROFINET devices along a single network line, significantly cutting industrial Ethernet switch costs and simplifying field cabinet cabling.
4. What protection does the conformal coating provide in harsh environments?
All internal circuit boards are sprayed with high-grade industrial conformal coating providing comprehensive protection against moisture, condensation, mold, and airborne salt spray. Combined with -40°C to +85°C industrial temperature tolerance, the gateway operates reliably in coastal wind farms, wastewater plants, and chemical processing facilities.
