Description
ProSoft MVI56-MCM
Technical Specifications
- Product type: ControlLogix Modbus communication module
- Rack compatibility: ControlLogix 1756 rack
- Backplane: ControlLogix backplane communication
- Serial ports: 2 independent RS485/RS232 ports
- Protocol: Modbus RTU, Modbus ASCII
- Role: Configurable Modbus Master or Slave
- Power supply: From ControlLogix rack backplane
- Operating temperature: 0 °C to +60 °C
- Storage temperature: -40 °C to +85 °C
- Humidity: 5% to 95%, non-condensing
- Protection: IP20
- Installation: Plug-in ControlLogix rack slot
- Data transfer: Bidirectional data exchange between PLC tag and Modbus register
Functional Features
- Dual independent serial communication ports
- Configurable Modbus master or slave mode
- Support Modbus RTU and Modbus ASCII protocol
- Bidirectional data mapping between ControlLogix tags and Modbus registers
- Front panel LED for module, port and communication status
- Communication error diagnostic and error counter
- Support multiple Modbus slave devices on one bus
- Backplane high-speed data exchange with ControlLogix CPU
- Programmable command list for master polling
- Hot-swap support in compatible ControlLogix racks
Application Scenarios
- Oil & gas pipeline RTU communication
- Water treatment plant Modbus instrument connection
- Power plant auxiliary system PLC communication
- Chemical factory Modbus flow meter and transmitter interface
- Mining equipment Modbus drive and sensor data collection
Materials and Construction
- Front panel: Metal shielding panel
- PCB: FR4 printed circuit board with conformal coating
- Backplane connector: Gold plated edge connector
- Serial port: Terminal block for RS485/RS232
- Communication chip: Serial transceiver IC
- LED: Multi-channel status indicator diodes
Structural Features
- ControlLogix standard plug-in module form factor
- Front metal panel with LED indicators
- Front screw terminal block for two serial ports
- Rear gold finger edge connector for rack backplane
- Internal isolation circuit between backplane and serial ports
- Module locking latch on front panel
Working Principle The module communicates with ControlLogix CPU through rack backplane and reads or writes PLC tag data. On serial ports, module works as master to poll multiple Modbus slave devices or acts as slave responding to external Modbus master. Internal data mapping table transfers data between PLC memory and Modbus register space. LEDs show module health and serial port communication activity.
Installation Requirements
- Insert module into empty slot of ControlLogix rack, hot-swap supported
- Use shielded twisted pair cable for Modbus serial wiring
- Set bus termination resistor at two cable ends for RS485
- Ambient temperature kept 0 °C to +60 °C
- Configure module firmware and Modbus command list in RSLogix5000 software
- Complete rack grounding
- Match baud rate, parity and data bit parameters with field Modbus devices
Precautions
- RS485 bus wiring must follow single main trunk topology
- Set correct bus termination resistor
- Match communication parameters on both sides of serial link
- Check communication error counters during maintenance
- Store spare module in anti-static moisture-proof packaging
- Wear ESD wrist strap when handling module
