PLX31-EIP-MBS4

Overview

• Model: PLX31-EIP-MBS4

• Type: Serial Four‑Port Communication Gateway

• Application: Provides EtherNet/IP™ to Modbus Serial connectivity for Rockwell Automation PLCs, supporting multiple protocols and four configurable serial ports

EtherNet/IP™ Specifications

• Class 3 Server Connections: 5

• Class 3 Client Connections: 2 connected, 1 unconnected

• Class 1 I/O Connections: 8

• I/O Connection Sizes: 248 / 248

• Max RPI Time: 5 ms per connection

• Supported PLC Types: PLC2, PLC5, SLC, CLX, CMPLX, MicroLX

• Supported Message Types: PCCC and CIP

• CIP Services Supported:

  • 0x4C – CIP Data Table Read

  • 0x4D – CIP Data Table Write

• Command List Support: 100 commands per client, configurable for type, IP, register addressing, word/bit count

• Command Sets: PLC‑2/PLC‑3/PLC5 Basic, PLC5 Binary, PLC5 ASCII, SLC500

Modbus Serial Specifications

• Command List: Up to 100 commands per master port, fully configurable

• Supported Function Codes:

  • 1: Read Coil Status

  • 2: Read Input Status

  • 3: Read Holding Registers

  • 4: Read Input Registers

  • 5: Write Single Coil

  • 6: Write Single Holding Register

  • 15: Write Multiple Coils

  • 16: Write Multiple Holding Registers

  • 22: Mask Write Holding Register (Slave only)

  • 23: Read/Write Holding Registers (Slave only)

• Communication Parameters:

  • Baud rate: 110 … 115.2 kbps

  • Parity: None, Even, Odd

  • Data size: 7 or 8 bits

  • Stop bits: 1 or 2

  • RTS delay: 0 … 65535 ms

• Modes: Modbus RTU (CRC‑16), Modbus ASCII (LRC)

• Floating Point Data: Supported (Enron and Daniel implementations)

• Polling: Continuous, on change, or user‑enabled

• Status Data: Error codes per command, slave status list per port

• Node Address: 1 … 247 (software selectable)

• RS Interfaces: RS‑232, RS‑422, RS‑485

• Buffer Size: 255‑byte transmit length, configurable delay

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