ProSoft 3100-INUSA Modbus Master/Slave Communications Module | Replacement, Equivalent & Selection Guide
The ProSoft Technology 3100-INUSA is a dedicated Modbus Master/Slave Communications Module designed for seamless integration with Allen-Bradley ControlLogix and CompactLogix PLC platforms. This in-chassis solution enables reliable serial Modbus RTU/ASCII communication between PLCs and field devices, making it a cornerstone component in industrial automation and process control systems.
Technical Specifications
- Part Number: 3100-INUSA
- Manufacturer: ProSoft Technology
- Protocol: Modbus RTU / Modbus ASCII (Master & Slave)
- Host Platform: Allen-Bradley ControlLogix / CompactLogix (1756 / 1769 backplane)
- Serial Ports: 2 × RS-232 / RS-422 / RS-485 (software-selectable)
- Baud Rate: 110 – 115,200 bps
- Max Nodes: Up to 247 Modbus slave nodes per port
- Data Memory: 4,000 registers (read/write)
- Power Consumption: 800 mA @ 5 VDC (from backplane)
- Weight: 230 g
- Operating Temperature: 0 °C to 60 °C
- Certifications: UL, CE, cUL
- Firmware: Field-upgradeable via ProSoft Configuration Builder (PCB)
Compatible Replacement & Equivalent Models
If the ProSoft 3100-INUSA is discontinued, out of stock, or outside budget, the following models offer compatible or equivalent functionality:
- ProSoft MVI56E-MNET – Modbus TCP/IP upgrade path for Ethernet-based networks
- ProSoft MVI56-MCM – Direct serial Modbus Master/Slave for ControlLogix, same backplane form factor
- ProSoft MVI69-MCM – CompactLogix equivalent for 1769 chassis
- Moxa CP-118EL-A – Multi-port serial PCI-E card for PC-based Modbus gateways
- Anybus X-gateway AB7072 – Protocol converter bridging Modbus RTU to EtherNet/IP
- Hilscher CIFX 50-RE – Multi-protocol fieldbus card supporting Modbus RTU/TCP
Note: Always verify backplane compatibility, firmware version, and register mapping before substituting modules in live systems.
Why Choose the Original Model
- Native ControlLogix Integration: Occupies a standard 1756 backplane slot — no external gateway hardware required.
- Dual-Port Flexibility: Two independently configurable serial ports allow simultaneous Master and Slave operation.
- Proven Reliability: Widely deployed in oil & gas, water treatment, and manufacturing for 15+ years.
- ProSoft Configuration Builder: Free, intuitive software for rapid commissioning and diagnostics.
- Extensive Register Space: 4,000 read/write registers minimize PLC ladder logic complexity.
Typical Applications
- SCADA / DCS integration via Modbus RTU serial links
- Legacy device communication (meters, drives, RTUs, analyzers)
- Oil & gas wellhead and pipeline monitoring
- Water/wastewater pump station control
- Building automation and energy management systems
- Manufacturing line data acquisition from serial instruments
System Compatibility
- PLC Platforms: Allen-Bradley ControlLogix (1756), CompactLogix (1769)
- Rockwell Software: Studio 5000 / RSLogix 5000 v16 and above
- Serial Standards: RS-232, RS-422, RS-485 (2-wire and 4-wire)
- Modbus Variants: RTU, ASCII, Master, Slave — all supported simultaneously
- Configuration Tool: ProSoft Configuration Builder (PCB) — free download
Selection Guide
Use the table below to select the right ProSoft Modbus module for your application:
| Model | Chassis | Protocol | Ports | Best For |
|---|---|---|---|---|
| 3100-INUSA | 1756 ControlLogix | Modbus RTU/ASCII | 2 × Serial | Serial Modbus legacy integration |
| MVI56-MCM | 1756 ControlLogix | Modbus RTU/ASCII | 2 × Serial | High-volume register applications |
| MVI69-MCM | 1769 CompactLogix | Modbus RTU/ASCII | 2 × Serial | Compact panel installations |
| MVI56E-MNET | 1756 ControlLogix | Modbus TCP/IP | 1 × Ethernet | Ethernet Modbus migration |
Quality Assurance & Sourcing
- Authenticity: All units sourced from authorized distributors or verified surplus channels with full traceability.
- Testing: Functional power-on and communication tests performed prior to shipment.
- Packaging: Anti-static ESD packaging with original or equivalent protective materials.
- Warranty: 90-day replacement warranty on all stocked units.
- Documentation: Datasheet, wiring diagram, and PCB configuration file available upon request.
How to Order
- Confirm your PLC chassis type (ControlLogix 1756 or CompactLogix 1769).
- Verify available backplane slots and power budget (800 mA @ 5 VDC required).
- Add ProSoft 3100-INUSA to cart or contact us for bulk/project pricing.
- Specify any required accessories: serial cables, RS-485 terminators, or DIN rail kits.
- Request a proforma invoice for bank transfer or L/C payment if needed.
📧 Email: [email protected] | 📞 Phone/WhatsApp: +0086 19859288691
Replacement & Compatibility FAQ
Q: Is the 3100-INUSA still in production?
A: ProSoft Technology has transitioned newer Modbus serial products to the MVI56E series. The 3100-INUSA is available as new-surplus or refurbished stock.
Q: Can the 3100-INUSA replace an MVI56-MCM directly?
A: Functionally similar, but register mapping and configuration files differ. A PCB reconfiguration is required — contact us for migration support.
Q: Does it support Modbus TCP/IP?
A: No. The 3100-INUSA is serial-only (RTU/ASCII). For Modbus TCP/IP, consider the MVI56E-MNET.
Q: What cable is required for RS-485 wiring?
A: Shielded twisted-pair (STP) cable, 120 Ω termination resistors at both ends of the bus.
Q: Can I get a configuration file template?
A: Yes — email [email protected] with your application details and we will provide a PCB template.
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