Foxboro P0916CA Termination Assembly

Foxboro P0916CA Termination Assembly

Description

The FBM217 Discrete Input Module provides 32 input channels, each accepting a 2-wire input from a DC voltage source. Associated termination assemblies (TAs) provide for discrete inputs of under 60 V AC, 120 V AC/125 V DC or 240 V AC. The module performs signal conversion required to interface the electrical input signals from the field sensors to the Module Fieldbus.

Depending on the type of I/O signal required, the TAs contain current limiting devices, high voltage attenuation circuits, optical isolation and external power source connections.

The module can be used as a single unit, or as a redundant pair (two FBM217s). When used as a redundant pair, the modules combine to provide redundancy at the Fieldbus Module (FBM) level, with field input signals received from one common termination assembly though a redundant adapter affixed to the FBMs' baseplate. The field input current for redundant modules is doubled. A redundant digital input block in the Foxboro Evo™ Control Software validates each input in conjunction with information to/from the module, and selects the input with the highest quality for processing in the control strategy.

In a redundant configuration, contact sense power from each module is diode OR'd together in the redundant adapter to assure redundant power.

A redundant contact input function block, CINR, is used for each redundant pair of inputs. The CINR block handles input reads and initialization logic for the redundant channels. On each execution cycle of the CINR block, identical reads are sent to both modules, fully exercising the fieldbus and the logic circuitry of each module.

When connected to the appropriate TAs, the FBM217 module provides functionality formerly provided by the 100 Series FBM I/O subsystem. TAs are available which support the functionality of the 100 Series main FBM07A/B, FBM08, FBM20, and FBM24A/B/C (16 input main FBMs). Expansion TAs are available for use with these main FBM TAs to support the functionality of expansion FBM12, FBM13, FBM21, or FBM25A/B/C (16 input expansion FBMs).

Feature

• Thirty-Two (32) discrete inputs
• Supports discrete input signals at voltages of:

  15 to 60 V DC

  120 V AC/125 V DC

  240 V AC

• Single or redundant modules
• Rugged design suitable for enclosure in Class G3 (harsh) environments per ISA Standard S71.04
• Executes the programs for Discrete Input, Ladder Logic, Pulse Count, and Sequence of Events, with the configurable options: Input Filter Time and Fail-Safe Configuration
• Various Termination Assemblies (TAs) that contain:

  High voltage attenuation and optical isolation for inputs

  External power connection for device excitation

Technical Specifications