Product Short Description
Product Name: ProSoft 3100-MCM Modbus Communication Module for PLC-5
Product Introduction:
The ProSoft 3100-MCM is a Modbus Master/Slave communication module developed for Allen-Bradley PLC-5 processors. It enables Rockwell Automation PLC systems to communicate directly with Modbus-compatible devices including drives, analyzers, meters, and third-party control equipment, extending the life of legacy PLC-5 installations.
Description
Technical Specifications:
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Manufacturer: ProSoft Technology
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Compatible Controllers: Allen-Bradley PLC-5
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Module Type: Modbus communication interface
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Supported Protocols: Modbus RTU, Modbus ASCII
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Operating Modes: Master or Slave (independent per port)
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Communication Ports: 2 × DB-25 female
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Electrical Standards: RS-232, RS-422, RS-485 (configurable)
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Baud Rate Range: 300 to 19.2 kbps
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Data Format: 8 data bits, selectable parity, 1 stop bit
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Maximum Nodes: Up to 32 nodes per RS-485 segment
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Power Supply: 5 VDC from PLC backplane
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Operating Temperature: 0 °C to +60 °C
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Storage Temperature: -40 °C to +85 °C
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Humidity: 5–95% non-condensing
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Lifecycle Status: Discontinued / legacy product
Functional Features:
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Dual independent ports allow simultaneous Master and Slave operation
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Supports both Modbus RTU and Modbus ASCII protocols
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Configurable via DIP switches and ProSoft configuration tools
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Draws power directly from the PLC-5 backplane — no external supply needed
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LED indicators provide module and communication status
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Bridges legacy PLC-5 systems with modern Modbus field devices
Application Scenarios:
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Integration of Modbus RTU/ASCII field devices into existing PLC-5 systems
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Process automation requiring connectivity to Modbus drives and analyzers
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Utility systems linking meters and third-party controls to PLC-5
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Legacy system modernization without replacing the core controller
Installation Requirements:
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Insert directly into a PLC-5 chassis slot
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Verify backplane power supply has sufficient headroom for the module draw
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Configure DIP switches for baud rate, parity, and node address
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Use high-quality shielded twisted-pair cabling for RS-485 networks
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RS-232 cable runs limited to approximately 15 meters; RS-485 extends to 1200 meters
Usage Notes:
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Port 1 can be set as Master while Port 2 acts as Slave, or any combination thereof
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Proper termination resistors are required on RS-485 multi-drop networks
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As a discontinued product, source from authorized surplus suppliers with warranty
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Configure using ProSoft configuration tools for precise protocol behavior
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