The Foxboro SCD2200 is a versatile, modular Remote Terminal Unit (RTU) designed for high-performance data acquisition and control in geographically dispersed environments. Below are the technical details for the specific modules in your configuration.
System Components & Specifications
| Component | Model/Part | Function | Key Specifications |
|---|---|---|---|
| Rack | PS-22 | Power Supply Module | 24V DC Input; provides regulated backplane power. |
| CPU | CP-3 | Processor Module | High-speed logic execution; supports multiple protocols (DNP3, Modbus). |
| Communication | MC-31 | Master Comm Module | Expanded serial/Ethernet connectivity for SCADA integration. |
| Analog Input | AI-10 | Analog Input Module | 8-Channel; 4-20mA or 0-10V DC high-resolution inputs. |
| Digital I/O | IO-3 (x2) | Digital I/O Module | 16-Channel configurable Digital Input/Output per module. |
Detailed Product Descriptions
CP-3 CPU Module The CP-3 serves as the “brain” of the SCD2200 RTU. It executes the application program, manages real-time data logging, and coordinates communication between I/O modules and the master station. It is designed for low power consumption while maintaining the processing power required for complex math and logic functions.
AI-10 Analog Input Module The AI-10 provides precise measurement of field variables such as pressure, flow, and temperature. Each channel features individual surge protection and high-level noise rejection, ensuring that signal integrity is maintained even in harsh electromagnetic environments.
IO-3 Digital I/O Module The IO-3 is a high-density digital module. In your configuration, having two of these modules provides 32 total digital points. These can be used for monitoring status contacts (e.g., valve position, motor run status) or for controlling external relays and actuators.
Application Areas
This Foxboro configuration is widely used in Oil & Gas pipeline monitoring, Water/Wastewater management, and Power Distribution Automation. It is particularly valued in remote sites where high reliability, low power draw, and modular expansion are critical requirements.
Operational Precautions
- Backplane Seating: Ensure all modules are firmly seated into the PS-22 rack. Loose connections can lead to intermittent “Module Missing” errors in the CPU diagnostics.
- Power Loading: Verify that the total current draw of the CP-3, MC-31, AI-10, and both IO-3 modules does not exceed the rated output of the PS-22 power supply.
- Shielding: For the AI-10 module, use twisted-pair shielded cable for all analog signals. Connect the shield at one end only (typically the RTU side) to prevent ground loops.
- Firmware Consistency: Ensure that the firmware versions of the CP-3 and the I/O modules are compatible with the version of the Foxboro configuration software being used.
Recommended Similar Product Models
| Model Number | Category | Feature Set |
|---|---|---|
| CP-4 | Next-Gen CPU | Enhanced memory and processing speed. |
| AI-11 | Analog Input | RTD/Thermocouple specialized input. |
| PS-21 | Power Supply | AC Input variant (110/220V AC). |
| AO-10 | Analog Output | 4-Channel 4-20mA output module. |
| CO-10 | Counter Module | High-speed pulse accumulation for flow meters. |
