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Key Technical Specifications
- Product Model: MVI56-PDPS
- Manufacturer: ProSoft Technology
- Compatible Backplane: Allen-Bradley ControlLogix (1756 chassis)
- Communication Protocol: Profibus DP Slave
- Data Exchange: Configurable data sizes (typically up to 244 bytes input/output)
- Baud Rate: Auto-negotiates with the master, supports up to 12 Mbps
- Configuration: Via ProSoft Configuration Builder (PCB) software
- Diagnostics: Comprehensive status and diagnostic data available in the ControlLogix tag database
- Power Consumption: 1.0A @ 5V DC (typical)
Core Performance and Selection Advantages
The MVI56-PDPS module is essential for projects that require interoperability between a Rockwell Automation ControlLogix system and a Profibus DP master controller (often from Siemens or other European manufacturers). Its key advantage is seamless integration. By residing directly in the ControlLogix chassis, it leverages the high-speed backplane to transfer data between the Profibus network and the ControlLogix processor’s memory. This eliminates the latency and complexity associated with external gateways that use serial or Ethernet connections.
From a Total Cost of Ownership (TCO) perspective, this module simplifies system architecture. It allows engineers to maintain the ControlLogix programming environment (RSLogix 5000 / Studio 5000) for logic development while seamlessly exchanging data with the overarching Profibus master. This approach avoids the need for a separate intermediary PLC or complex custom communication scripts, reducing both hardware costs and engineering time.
MVI56-PDPS PROSOFT
System Integration and Extensibility
Programming and Software: Configuration is handled through ProSoft’s Configuration Builder (PCB) software. The module maps Profibus data directly into the ControlLogix controller’s tag database. This means that data from the Profibus master appears as standard tags in the ControlLogix program, and data sent to the master is written to output tags. This abstraction allows ControlLogix programmers to work within their familiar environment without needing deep expertise in Profibus telegram configuration.
Communication and Networking: As a Profibus DP Slave, the module responds to cyclic data requests from the Profibus Master. It supports standard Profibus diagnostics, allowing the master controller to monitor the health of the ControlLogix system. This module is typically used in scenarios where a central master (e.g., a Siemens S7-400) needs to coordinate multiple subsystems, with the ControlLogix acting as a high-performance subordinate for a specific machine or process area.
Expansion Capability: The module’s data capacity is configurable based on the Profibus network’s requirements. For systems requiring multiple protocol connections, additional ProSoft modules (e.g., for Modbus, EtherNet/IP Scanner, etc.) can be installed alongside the MVI56-PDPS in the same ControlLogix chassis, providing a flexible multi-protocol solution.
