Intro Summary: ETH‑300 adds Ethernet data and Modbus TCP capability to Siemens S7‑300 PLCs, ideal for connecting touchscreens, SCADA, and network devices.
Product Overview
The ETH‑300 (straight‑through) and ETH‑300‑2P (bridge‑type) modules convert the MPI/PPI serial port on Siemens S7‑300 and S7‑200 PLCs into a standard 10/100 Mbps Ethernet port for data acquisition and networking. They support Siemens S7 TCP and Modbus TCP protocols and allow multi‑client communication, enabling integration with SCADA systems, HMI touchscreens (Proface, Kunlun, Delta, etc.), and industrial control boards . The 2P version adds bridge‑mode support for devices lacking multi‑master communication .
How to Use
- Power the module from the PLC’s 24 V DC bus or a separate supply.
- Insert the RJ45 network cable into the 10/100 Mbps port and connect your switch or device.
- Use STEP7 / TIA Portal or configuration tools to assign IP settings (address, gateway).
- Select communication protocol (S7 TCP or Modbus TCP) and configure client/server roles.
- Connect target devices: SCADA software, HMIs, or touchscreens via Ethernet.
- Monitor communications via Web UI or software tools.
Tips: choose ETH‑300‑2P for devices without MPI multi‑master support. Ensure correct baudrate and subnet settings.
Frequently Asked Questions (FAQ)
- What is the difference between ETH‑300 and ETH‑300‑2P?
The 2P version is bridge‑type to support devices that don’t allow MPI multi‑master connections. - Which PLCs are compatible?
Siemens S7‑300 series and some S7‑200 with MPI/PPI ports. - What protocols are supported?
Siemens S7 TCP (S7 comm over Ethernet) and Modbus TCP. - How many network clients can connect simultaneously?
Supports multiple Modbus TCP clients via built‑in server support . - Does it require power from the PLC?
Accepts 24 V DC power from the PLC rack bus or external supply. - What is the network speed?
10/100 Mbps via RJ45. - Is configuration done via Web UI?
Yes—inbuilt Web UI or configuration via STEP7/TIA. - Can it connect SCADA systems?
Yes, fully compatible with common SCADA via Modbus TCP or S7 TCP. - Do you need additional converters?
No, it’s a direct serial‑to‑Ethernet bridge—no ratified converter required. - What environments is it suited for?
Industrial automation, HMI integration, SCADA, data acquisition in harsh conditions.
User Review Summary
Users on platforms like Amazon report smooth setup and reliable operation. Pros: straightforward installation, solid compatibility with Siemens PLCs and touchscreens, stable connection. Cons: limited to older S7-300/200 series, no gigabit support, documentation is basic.
Comparison with Competing Products
Product A: Siemens CP343‑1 communication processor (native Ethernet port on CPU)
– Native support, faster integration, but higher cost and only S7‑300 variant compatibility.
Product B: Third‑party MPI‑Ethernet converters (generic brands)
– May support Modbus TCP only, less seamless for S7 TCP and fewer simultaneous clients.
ETH‑300 vs ETH‑300‑2P: both support same protocols; select ETH‑300‑2P if target devices don’t support multi‑master MPI communication.
Technical Specifications
– Communication interface: Siemens MPI/PPI serial port to RJ45 10/100 Mbps Ethernet
– Protocols: Siemens S7 TCP, Modbus TCP
– Mode: straight‑through (ETH‑300) or bridge‑type (ETH‑300‑2P)
– Power: 24 V DC directly from PLC rack or external supply
– Support: multi‑client Modbus TCP server built‑in
– Housing: DIN‑rail compatible module for S7‑300 rack
– Dimensions, weight: per official manual (PDF) available from AMSAMOTION
Brand or Manufacturer Info
AMSAMOTION specializes in cost‑effective industrial automation modules and communication adapters, focusing on Siemens PLC compatibility and affordable Ethernet connectivity.
Purchase Recommendations
Amsamotion: https://www.amsamotion.store/product/eth-300-eth-300-2p-module