FOXBORO FBM207B P0914WH Contact Sense Input Modules

FBM207B(P0914WH) Discrete inputs can be sensed across all the usual voltage levels found in industrial facilities. The FBM207/b/c uses one of the several termination assemblies to match to the externally powered voltage level. In cases where the inputs are critical to the plant's control scheme, the FBM 207/b/c may be installed as a redundant pair with standard control blocks used to manage the redundancy.

The FBM207/b/c Voltage Monitor/Contact Sense Input Module functions as a 16-channel dc voltage monitor or 16-channel contact sensor. Each channel accepts a 2-wire input from a dc voltage source (FBM207) or pair of contacts or solid state switches (FBM207b/ FBM207c). Associated termination assemblies (TAs) support discrete input signals at voltages of 60 V dc, 120 V ac/125 V dc, or 240 V ac. For voltages higher than 60 V dc, the TAs have additional signal conditioning hardware that provides voltage attenuation and optical isolation.

The module is available in three distinct types, and each type with its associated TA supports discrete inputs as shown below:

Each discrete input is galvanically isolated from other channels and ground. Group isolated when used with external excitation.

The module performs signal conversion required to interface electrical input signals from field sensors to the redundant module Fieldbus. In addition, it executes programs for Discrete Input, Ladder Logic, Pulse Count, and Sequence of Events, with configurable options of Input Filter Time.

The module can be used as a single unit, or as a redundant pair (two FBM207s). 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 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.

Key features of the FBM207/b/c modules are:

 Sixteen discrete inputs

 Supports discrete input signals at voltages of:

• 15 to 60 V dc - contact sense • 120 V ac/125 V dc - voltage monitoring or switch inputs
• 240 V ac - voltage monitoring or switch inputs

 Each input is galvanically isolated. Group isolated with external excitation

 Single or redundant modules

 Compact, rugged design suitable for enclosures in Class G3 (harsh) environments

 Executes programs for Discrete Input, Ladder Logic, Pulse Count, and Sequence of Events with configurable Input Filter Time option

 Termination Assemblies (TAs) for locally or remotely connecting field wiring to the FBM207

 Termination Assemblies for per channel internally and/or externally loop powered devices

 Various Termination Assemblies (TAs) have additional signal conditioning hardware that provides voltage attenuation and optical isolation.

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