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PROSOFT PLX31-EIP-MBS Connection Controller
PROSOFT PLX31-EIP-MBS
The PROSOFT PLX31-EIP-MBS (also known as PLX31-EIP-MBS4) is an industrial-grade EtherNet/IP (EIP) to Modbus Serial (Modbus RTU/ASCII) communication gateway. It is primarily designed to connect Rockwell Automation’s ControlLogix, CompactLogix, and other controllers supporting the EtherNet/IP protocol (such as Allen-Bradley PLCs) with traditional Modbus serial devices (including Modbus RTU sensors, meters, legacy PLCs, etc.).
1. Core Overview and Main Functions
- Protocol Bridging: Establishes bidirectional communication between the EtherNet/IP fieldbus (PNU network) and Modbus serial network (RS-485/RS-232), enabling transparent data transmission.
- Data Conversion: Supports mutual mapping between EtherNet/IP I/O (CIP Data Tables) and Modbus function codes (FC01-FC04, FC05-FC06, FC15-FC16, etc.).
- Compatibility: Compatible with Allen-Bradley’s ControlLogix and CompactLogix series PLCs, commonly used for upgrading obsolete Modbus systems or integrating new controllers into traditional Modbus field environments.
2. Key Technical Specifications
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Specification
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Detailed Description
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Network Interface
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1 x 10/100 Mbps Ethernet port (supports Auto-MDI/MDIX)
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Serial Interface
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1 x RS-485/RS-232 interface (supports Modbus RTU/ASCII)
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Power Supply
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24 VDC (external power supply)
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Supported Modbus Function Codes
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1: Read Coil Status 2: Read Input Status 3: Read Holding Registers 4: Read Input Registers 5: Force Single Coil6: Preset Single Register 15: Force Multiple Coils 16: Preset Multiple Registers22: Mask Write Register 23: Read/Write Register
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Connection Capacity
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Supports simultaneous connection of 10 EIP clients (PLCs) and 5 Modbus server (slave) ports
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Communication Rate
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Modbus port supports 110 bps to 115.2 kbps (configurable)
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Environmental Adaptability
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Operating temperature range: 0℃ – 55℃, suitable for general industrial environments
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3. Key Features
- High-Speed Bidirectional Communication: Supports bidirectional data transmission between EIP and Modbus TCP/IP with a data transfer rate of up to 10/100 Mbps, meeting real-time control requirements.
- Security: Equipped with RADIUS security features, ensuring network communication security through advanced authentication and encryption technologies.
- Flexible Configuration: Comes with ProSoft Configuration Builder software, enabling flexible configuration of the module’s network parameters, communication rate, port mode (RTU/ASCII), etc.
- Powerful Data Processing Capability: Supports read/write operations for up to 10,000 16-bit registers, suitable for large-scale data exchange.
- Integrated Management: Built-in SD card slot for storing configuration files, and supports ProSoft Discovery Service for IP address scanning and remote configuration.
4. Structure and Composition
- Physical Interfaces: Typically includes one RJ45 Ethernet interface and one DB9 (or M8) serial interface.
- Internal Chips: Integrates dedicated protocol conversion chips and microprocessors for executing the EtherNet/IP CIP stack and Modbus protocol stack.
- Firmware and Software: Built-in configurable firmware, which users can configure through ProSoft tool software on a PC.
5. Typical Application Areas
- SCADA System Integration: Integrates modern PLC systems with traditional Supervisory Control And Data Acquisition (SCADA) systems.
- Data Acquisition: Collects data from on-site Modbus sensors (temperature, flow, pressure) and uploads it to the EtherNet/IP network for monitoring.
- System Upgrade: Upgrades the core controller of the control system to Rockwell’s ControlLogix or CompactLogix without replacing on-site Modbus devices.
- Power Monitoring: In the power industry, connects obsolete Modbus power monitoring devices with modern control systems.
6. Installation and Maintenance Recommendations
Hardware Connection:
- Connect the Ethernet port to the EtherNet/IP network where the controller is located.
- Connect the serial port to Modbus field devices (ensure correct physical layer connection of RS-485/RS-232 and pay attention to terminal resistor matching).
IP Address Configuration:
Use ProSoft Configuration Builder or Discovery Service to assign an IP address matching the network segment to the gateway.
Protocol Mapping:
Configure the corresponding relationship between the EtherNet/IP CIP data table address and the Modbus register/coil address in the software.
Regular Inspection:
Monitor the communication status LEDs, check for communication error codes or timeout errors, and ensure good contact of network cables.
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