ProSoft ILX34-MBS485
ProSoft ILX34-MBS485 - Image 2

ProSoft ILX34-MBS485

Product Introduction: ILX34-MBS485 is a high-performance Modbus serial communication module manufactured by ProSoft Technology. It plugs directly into Rockwell 1734 Point I/O rack or CompactLogix L1 controller local I/O system. It delivers bidirectional Modbus RTU data exchange between Rockwell Allen‑Bradley control platform and Modbus RTU field devices. The module supports configuration as Modbus master or Modbus slave to collect sensor data or send control commands to serial instruments.

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Description

ProSoft ILX34-MBS485

Technical Specifications:

  • Backplane Interface: Rockwell 1734 Point I/O backplane
  • Serial Interface: RS-485 two-wire half duplex
  • Supported Protocol: Modbus RTU
  • Operation Mode: Configurable as Modbus Master or Modbus Slave
  • Baud Rate Range: 1200 bps to 115200 bps
  • Maximum Nodes on RS-485 Bus: Up to 32 Modbus slave devices
  • Maximum Cable Distance: 1219 meters at low baud rate
  • Data Bits: 7 or 8 bits
  • Parity: None, Odd, Even
  • Stop Bits: 1 or 2 bits
  • Operating Temperature: -20 °C to +55 °C
  • Storage Temperature: -40 °C to +85 °C
  • Relative Humidity: 5% to 95%, non-condensing
  • Dimensions: 56 mm × 12 mm × 75.5 mm
  • Weight: 30 g
  • Mounting: 1734 Point I/O rack slot mounting
  • Vibration Resistance: 5 g vibration test compliance
  • Certifications: UL, CE, RoHS

Function Features:

  • Native integration with Rockwell 1734 Point I/O and CompactLogix L1 backplane
  • Flexible master/slave mode selection for Modbus RTU serial communication
  • Bidirectional data mapping between Modbus register and Allen‑Bradley controller tag memory
  • Built-in communication timeout and error handling for unstable serial bus
  • Onboard TX, RX and module status LED indicators for real-time diagnostic
  • Support Modbus function codes for read coil, read holding register, write single register and write multiple registers
  • Configurable message polling interval for Modbus master mode
  • Non-volatile memory stores module configuration parameters after power loss
  • Hot swap capability for replacement without shutdown of entire control rack
  • Isolation protection for RS-485 serial port against surge and electrostatic interference

Application Scenarios:

  • Building automation Modbus instrument connection for Rockwell PLC system
  • Power distribution meter data collection via Modbus RTU
  • Water treatment Modbus sensors, flow transmitters and level gauges integration
  • Petrochemical plant field Modbus RTU device communication
  • Packaging machinery Modbus variable frequency drive data acquisition
  • HVAC system Modbus controller interface for CompactLogix platform

Material Composition:

  • Housing: Flame retardant reinforced plastic module shell
  • Main PCB: FR4 fiberglass printed circuit board
  • Core Chips: Industrial communication processor, RS-485 transceiver chip
  • Backplane Connector: Gold-plated edge connector for 1734 I/O rack
  • Serial Terminals: Tin-plated copper screw terminal blocks for RS-485 wiring
  • Passive Components: ESD protection diodes, precision resistors and capacitors
  • LED: SMD status indicator diodes

Structural Features:

  • Slim narrow form factor designed for 1734 Point I/O rack slot
  • Front panel carries status LED indicators and model marking
  • Screw terminal block on front side for RS-485 field bus wiring
  • Rear gold-plated edge connector to plug into 1734 backplane
  • Internal circuit separation between backplane logic section and RS-485 serial circuit
  • Plastic locking clip to secure module inside I/O rack slot
  • Small lightweight structure saves cabinet space for distributed I/O stations

Working Principle: The module communicates with CompactLogix L1 controller via 1734 Point I/O backplane. When set as Modbus master, the module sends polling commands to RS-485 Modbus slave instruments, reads register data and transfers data to PLC controller tags. When set as Modbus slave, the module receives commands from external Modbus master and responds with data stored in PLC memory. The serial transceiver converts parallel backplane data into RS-485 differential serial signals. The module continuously monitors serial communication status and reports communication faults to PLC controller, with corresponding LED indicator activation upon fault occurrence. All configuration parameters save to onboard non-volatile memory.

Installation Requirements:

  • Insert ILX34-MBS485 module into vacant slot of 1734 Point I/O rack
  • Wear anti-static wristband during module handling and replacement
  • Use shielded twisted pair cable for RS-485 field bus wiring
  • Install 120 ohm terminal resistor at the two physical endpoints of RS-485 bus
  • Separate RS-485 signal cable from high voltage power cables
  • Complete backplane locking after module insertion
  • Keep ambient temperature within -20 °C to +55 °C
  • Maintain cabinet dry and dust-free environment

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