The Ebyte PN1-S25T is an industrial-grade PROFINET to Modbus TCP/RTU gateway module operating at 3.3V TTL, designed for seamless, code-free PLC integration in Siemens TIA Portal and STEP 7 via GSD files, offering bi-directional memory mapping, Modbus status byte monitoring, dual RJ45/RS485 connectivity on its PN1-S25T-TB evaluation kit, and compact 27x27x3mm surface-mount form factor for industrial automation networks.
| Parameter | Specification |
|---|---|
| Protocol Support | PROFINET I/O to Modbus TCP / Modbus RTU Slave/Master |
| Communication Interface | 3.3V UART (TTL Level) |
| Operating Voltage | DC 3.3V |
| Configuration Method | GSD File Integration (TIA Portal / STEP 7) |
| Dimensions & Weight | 27 x 27 x 3 mm | 4g (±1g) |
Key Features
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Code-Free PLC Integration: Native GSD file import enables plug-and-play mapping of Modbus data registers straight into Siemens TIA Portal or STEP 7 without writing custom communication code.
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Intuitive Memory Mapping: Modbus commands are loaded as standard modular blocks, creating a visual, direct register mapping between Modbus nodes and the Siemens PLC controller.
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Real-time Diagnostic Monitoring: Built-in status byte loading allows continuous, real-time polling of Modbus device connection integrity directly from the PLC master station.
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Flexible Prototyping Ecosystem: The PN1-S25T SMT stamp-hole module allows compact PCB design, while the PN1-S25T-TB offers dual Ethernet ports and isolated RS485 for immediate bench testing.
| Parameter | PN1-S25 | PN1-S25-TB | PN1-S25T | PN1-S25T-TB |
|---|---|---|---|---|
| Category | Profinet to ModBus RTU Module | PN1-S25 Test Board | Profinet to ModBus RTU/TCP Module | PN1-S25T Test Board |
| Profinet Ethernet Port | 10/100 Mbps auto-negotiation | 10/100 Mbps auto-negotiation | 10/100 Mbps auto-negotiation | 10/100 Mbps auto-negotiation |
| ModBus TCP Ethernet Port | — | — | 10/100 Mbps auto-negotiation | 10/100 Mbps auto-negotiation |
| Number of Serial Ports | Route 2 | Route 2 | Route 1 | Route 1 |
| Operating Voltage | DC 3.3V | DC 5V | DC 3.3V | DC 5V |
| Package Dimensions | 24 × 19 × 3.2 mm | 88 × 40 × 16.5 mm | 27 × 27 × 3.0 mm | 100 × 40 × 16.5 mm |
Industrial Installation & Wiring
The PN1-S25T SMT module is designed for automated surface-mount assembly on host controller PCBs operating at 3.3V digital logic. For evaluation and field deployments, the PN1-S25T-TB development board provides a standard Type-C 5V power port, terminal block connections for 2-wire RS485 differential communication, and dual RJ45 ports for PROFINET network topology and Modbus TCP bridging.
Practical Application Scenarios
1. Legacy Serial Field Instrument Integration into Siemens S7-1200/1500 PLCs
In factory automation retrofits, legacy RS485 Modbus RTU energy meters and sensor arrays cannot directly communicate with PROFINET industrial Ethernet. Embedded with the PN1-S25T, the gateway translates RS485 serial commands directly into PROFINET IO cyclic data, presenting field parameters to Siemens PLCs via simple GSD file configuration.
2. Multi-Protocol Industrial Ethernet Bridging for Smart Manufacturing
Manufacturing cells often combine Modbus TCP smart actuators and PROFINET control networks. The PN1-S25T-TB test kit acts as a dual-port protocol conversion hub, bridging Modbus TCP traffic from field IP nodes into standard PROFINET I/O controllers without complex network reconfiguration.
3. OEM Embedded PLC Interface Development for Specialized Machinery
Equipment OEMs building customized motor drives, CNC controllers, or thermal management systems can solder the PN1-S25T module directly onto main control boards. This adds native PROFINET slave capabilities to 3.3V microcontroller platforms, expanding market reach to Siemens-dominated industrial environments.
4. Distributed Building Automation & HVAC System Integration
Large-scale building management systems often rely on Modbus RS485 RTU loops for chiller and air handler telemetry. Utilizing Ebyte PN1-S25T gateway modules enables central PLC systems to continuously monitor remote equipment connection health via dedicated PROFINET status bytes for rapid troubleshooting.
FAQ
1. How is the PN1-S25T module configured within Siemens TIA Portal?
Configuration is handled entirely through standard GSD (General Station Description) files provided by Ebyte. Engineers simply import the GSD file into TIA Portal or STEP 7, select the required Modbus command modules, and map the I/O addresses directly to PLC data blocks without writing custom serial driver code.
2. What is the difference between the PN1-S25T module and the PN1-S25T-TB test kit?
The PN1-S25T is a compact (27x27x3mm) 3.3V SMT module intended for direct integration into custom PCB products. The PN1-S25T-TB is a fully equipped evaluation kit that adds a 5V Type-C power input, an RS485 transceiver interface, two RJ45 Ethernet ports, hardware reset buttons, and onboard LED diagnostic indicators for fast prototyping.
3. How does the module detect communication failures with downstream Modbus slave devices?
The PN1-S25T features a configurable status byte function. When enabled in the GSD configuration, the gateway module constantly updates a designated status byte within the PLC I/O map, providing immediate, real-time indication if a Modbus RTU or Modbus TCP slave drops offline or experiences transmission timeouts.
4. Can the PN1-S25T operate simultaneously on 5V logic systems?
The standalone PN1-S25T module operates natively at 3.3V TTL logic. When interfacing with 5V microcontrollers or field buses, external logic level shifters or RS485 transceivers are required. Alternatively, engineers can utilize the PN1-S25T-TB board, which handles 5V power input and onboard level conversion for RS485/RJ45 interfaces.
