Description
Application Scenarios
In an oil and gas refinery operating a legacy PLC-5 control system for pipeline pump station monitoring, operators needed to integrate Modicon quantum PLCs that managed downstream metering and valve control. The two systems spoke different protocols—the Allen-Bradley PLCs used proprietary backplane communication while the Modicon units relied on Modbus Plus networking. Rather than replacing either control platform, engineers installed ProSoft 3300-MBP modules in the PLC-5 racks, enabling the Allen-Bradley processors to read metering data from the Modicon nodes and write valve command setpoints back through the Modbus Plus network. The 3300-MBP’s 4000-word data space accommodated all pipeline parameters—flow rates, pressures, valve positions, and alarm statuses—with room for future expansion. The refinery avoided a $2M control system replacement and maintained its existing maintenance and training infrastructure.
For a power generation facility with a PLC-5 based boiler control system, the 3300-MBP provided a critical communication path to Modbus Plus-connected burner management equipment from a third-party vendor. The module’s Global Data functionality enabled high-speed exchange of critical interlocks and permissives, while the Master Command List allowed the PLC to poll up to 100 read/write commands to remote devices. When a burner management node failed, the 3300-MBP’s diagnostic LEDs and BTR status data immediately flagged the communication error, allowing operators to isolate the fault to a single network segment rather than troubleshooting the entire control system.
Parameter
| Parameter | Value/Description |
|---|---|
| Product Model | 3300-MBP |
| Manufacturer | ProSoft Technology |
| Product Category | Modbus Plus Communication Module |
| Compatible Platforms | Allen-Bradley 1771 I/O compatible processors (PLC-5, etc.) |
| Module Data Space | 4000 words (16-bit registers, addresses 0–3999) |
| Data Block Structure | 80 blocks × 50 words per block |
| Modbus Plus Ports | 1 (single-port) or 2 (redundant configuration) |
| Modbus Plus Connector | DB-9 Male |
| Configuration Port | RS-232 (front-panel, for module setup) |
| Node Address Range | 1 to 64 (DIP switch configurable) |
| Master Commands | 0 or 1–100 commands |
| Global Out Data | Up to 32 words |
| Global In Data | Up to 32 words per node from up to 32 nodes |
| Data Output Paths | 0 or 1–8 |
| Backplane Transfer | BTR/BTW (Block Transfer Read/Write) |
| Supported Functions | Write Multiple Registers (FC 16), Read Holding Registers (FC 3) |
| Operating Temperature | 0°C to 60°C |
| Storage Temperature | -40°C to 85°C |
| Relative Humidity | 5% to 95% (non-condensing) |
| Dimensions | Approx. 3.8 cm × 9 cm × 13 cm |
| Weight | Approx. 0.16 kg |
| Certification | UL Certified for Canada (Hazardous Locations) |
| Country of Origin | USA |
