I/A Series Discrete I/O Module Foxboro FBM219 P0917LH

Foxboro FBM219 P0917LH Discrete I/O Fieldbus Module

The Foxboro FBM219 P0917LH, also cataloged as the FBM219 Discrete I/O Module, operates as a dedicated hardware component for discrete signal acquisition and control within Foxboro I/A Series and Foxboro Evo DCS platforms. Configured with 24 discrete input channels and 8 discrete output channels, the board interfaces binary status contacts and switches directly with control processors. The module communicates across a redundant 2 Mbps Module Fieldbus, utilizing an internal 24 VDC contact-sense source for field inputs while controlling external-source discrete loads up to 60 VDC.

Hardware Specifications

Process Control and Digital Interface

The module utilizes group isolation to insulate internal fieldbus logic from external field wiring surges and common-mode noise in heavy industrial environments. Supporting 4-20 mA HART loop protocol cabling runs within shared termination cabinets, the module incorporates configurable input debounce filtering (0 to 32 ms) to eliminate contact bounce from field switches. Each output channel includes integrated overcurrent protection via 0.4 A fusing, ensuring stable binary state execution across connected solenoid valves and relay coils.

Frequently Asked Questions

Q: How does the internal contact-sense mode operate on the 24 discrete input channels?

A: The P0917LH termination assembly supplies an internal 24 VDC wetting voltage to the input terminals, detecting contact closure when field resistance drops below 1 kohm with a nominal current limit of 7 mA.

Q: Can the module be hot-swapped during active system operation?

A: Yes, the modular chassis design allows hot-swapping on the 200 Series baseplate without disconnecting field wiring or interrupting communications on the redundant Module Fieldbus.

Q: What protection is provided for the discrete output channels against short circuits?

A: Each output channel features individual 0.4 A overcurrent fusing to protect internal driver circuits from external field wiring faults or current overloads.

Field Installation Guidelines

Mount the FBM219 module onto its designated slot on the Foxboro 200 Series FBM baseplate, pressing firmly until the dual locking latches engage. Connect a 14 AWG copper bonding wire from the baseplate grounding stud directly to the cabinet main earth bar to establish a low-impedance path for noise dissipation. Verify that all baseplate connector pins are clear of dust and debris before seating the unit.

Route input contact-sense cables and output load wires through dedicated wire ducts, maintaining isolation from high-voltage AC power lines. Terminate all field conductors at the P0917LH compression-terminal assembly, ensuring screw terminals are torque-tightened to prevent high-resistance contacts. Installation technicians must wear a grounded ESD wrist strap when handling unmounted modules or adjusting fieldbus termination cabling.