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The PROSOFT MVI56-BAS is a modular communication base unit designed for Rockwell Automation’s ControlLogix platform, serving as the foundation for ProSoft Technology’s extensive range of protocol interface modules. This versatile chassis enables seamless integration of third-party networks (e.g., Modbus, PROFIBUS, CANopen) into Allen-Bradley control systems without requiring additional rack space. The PROSOFT MVI56-BAS accommodates up to four interchangeable daughter cards, allowing customized protocol support while leveraging the ControlLogix backplane for deterministic data exchange. Engineered for industrial environments, it operates across -40°C to +85°C with 50g shock resistance, making it ideal for harsh applications like oil refineries, water treatment plants, and manufacturing lines.
As the backbone of ProSoft’s MVI56 series, this module simplifies legacy equipment modernization and multi-vendor system integration. The PROSOFT MVI56-BAS supports dual-port isolation (2.5 kV) to prevent ground loops and includes diagnostic LEDs for real-time status monitoring. Its non-volatile memory retains configuration during power loss, while hot-swappable daughter cards minimize downtime during protocol upgrades. By bridging disparate industrial networks, the PROSOFT MVI56-BAS transforms ControlLogix processors into universal communication gateways, eliminating the need for external protocol converters.
PROSOFT MVI56-BAS
Technical Specifications
| Parameter Name | Parameter Value |
| Product Model | MVI56-BAS |
| Manufacturer | ProSoft Technology |
| Product Type | Modular Communication Base Unit |
| Compatible Platform | Rockwell ControlLogix (1756 chassis) |
| Backplane Current | 800 mA @ 5.1 VDC (max) |
| Daughter Card Slots | 4 (hot-swappable) |
| Isolation Voltage | 2.5 kV (port-to-backplane) |
| Operating Temperature | -40°C to +85°C |
| Relative Humidity | 5–95% (non-condensing) |
| Shock Resistance | 50g (11 ms, IEC 60068-2-27) |
| Vibration Resistance | 5g (10–500 Hz, IEC 60068-2-6) |
| Certifications | CE, cULus, ATEX Zone 2 |
| Dimensions | 135 × 118 × 35 mm |
| Weight | 450 g |
| Protocol Support | Via daughter cards (Modbus, PROFIBUS, etc.) |
Main Features and Advantages
Modular Flexibility: Configure the PROSOFT MVI56-BAS with any combination of ProSoft’s 30+ protocol daughter cards. Mix Modbus TCP, PROFIBUS-DP, and EtherNet/IP modules in a single ControlLogix slot, adapting to evolving network requirements without hardware replacement.
Deterministic Performance: Direct backplane integration ensures scan-synchronous data transfer to ControlLogix processors. Dual-port architecture isolates field networks from the control system, preventing noise-induced faults. The module’s 32-bit RISC processor handles protocol processing independently, reducing PLC CPU overhead.
Robust Engineering: Conformal-coated PCB withstands corrosive atmospheres. Redundant power inputs (via ControlLogix backplane) maintain operation during voltage fluctuations. The PROSOFT MVI56-BAS supports firmware updates in-field without chassis removal.
Advanced Diagnostics: Per-port status LEDs simplify troubleshooting. Built-in web server provides detailed traffic statistics, error counts, and buffer utilization. Configuration backup/restore via SD card slot ensures rapid recovery.
Application Field
The PROSOFT MVI56-BAS enables cross-platform integration in diverse industries:
Energy Management: Connects ControlLogix to Modbus RTU power meters in solar farms
Water/Wastewater: Interfaces SCADA systems with legacy PROFIBUS sensors in pumping stations
Manufacturing: Bridges Siemens PLCs to Rockwell HMIs in automotive assembly lines
Oil & Gas: Integrates CANopen-based compressors with DCS systems in offshore platforms
Pharma: Synchronizes batch records between Rockwell and OPC-UA servers
Mining: Links RFID equipment trackers to ControlLogix safety systems
PROSOFT MVI56-BAS
Related Products
PROSOFT MVI56E-MCM: Modbus TCP/IP daughter card
PROSOFT MVI56-PDPMV1: PROFIBUS-DP master module
PROSOFT MVI56-GEC: EtherNet/IP to Generic Ethernet gateway
PROSOFT MVI56G-MCM: Modbus Plus communication card
PROSOFT 8130-PSDK: Protocol development kit for custom interfaces
PROSOFT ILX56-PBM: PROFIBUS slave adapter
Installation and Maintenance
Pre-installation preparation: Verify ControlLogix firmware compatibility (v16+). Discharge static electricity before handling daughter cards. Allocate 500 kB of controller memory for data buffers. Configure rack slot as “I/O Module” in Studio 5000.
Maintenance recommendations: Update firmware using ProSoft Configuration Builder software annually. Clean air vents quarterly in dusty environments. Test isolation barriers every 24 months with 500 VDC megger. Replace backup battery (CR2032) every 5 years.
