Description
Foxboro FBM207C
Technical Specifications
- Product Type: 16-Channel Discrete Input Module.
- Signal Type: 48 VDC Contact Sense.
- Channel Count: 16 isolated and independent channels.
- Communication: Redundant 2 Mbps module Fieldbus.
Functional Features
- Contact Sensing: Accepts 2-wire inputs from pairs of contacts or solid-state switches.
- Group Isolation: Each channel is current isolated, with group isolation provided for external excitation.
- Configurable Filtering: Supports programmable input filter/debounce times (No Filtering, 4, 8, 16, or 32 ms).
- Redundancy Support: Can be installed as a redundant pair to ensure maximum system availability.
Application Scenarios
Widely deployed in power plants, chemical processing, and heavy manufacturing for monitoring high-voltage DC control circuits, limit switches, and critical safety interlocks.
Performance Parameters
- Open-Circuit Voltage: 48 VDC ±15%.
- Short-Circuit Current: 3.2 mA (typical).
- ON-State Resistance: 1.0 kΩ (maximum).
- OFF-State Resistance: 100 kΩ (minimum).
Material Composition
Housed in a rugged, extruded aluminum enclosure for superior physical protection and EMI shielding. Internal PCBs feature industrial-grade components with conformal coating to resist moisture and corrosive gases.
Structural Characteristics
Compact modular design that mounts on a DIN rail or rack-mounted baseplate. Features front-panel visual indicators for module status and individual channel states, allowing for rapid field diagnostics.
Working Principle
The module provides an internal 48 VDC excitation voltage to the connected field contacts. When a contact closes, the resulting current flow is detected by the module’s internal opto-isolators, converting the physical switch state into a digital logic signal transmitted over the Fieldbus to the controller.
Installation Requirements
Must be installed on a compatible FBM baseplate. For redundant configurations, modules must be placed in adjacent odd/even positions with a redundancy adapter. Ensure proper termination using the specified Terminal Assembly (TA).
Usage Precautions
- Never exceed the 48 VDC rating to prevent internal component damage.
- Ensure the correct debounce time is configured in the software to prevent false triggering from mechanical switch bounce.
- Always verify wiring polarity before applying power.
