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　　Overview

　　Discrete inputs can be sensed across all the usual voltage levels found in industrial facilities. The Compact FBM207/b/c Voltage Monitor/Contact Sense Input Interface Modules use one of the several termination assemblies to match to the externally powered voltage level.https://www.axcontroler.com/

　　The Compact FBM207/b/c Voltage Monitor/Contact Sense Input Interface Module functions as a 16-channel dc voltage monitor (FBM207) or 16-channel contact sensor for 24 V dc inputs (FBM207b) or 48 V dc inputs (FBM207c). 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. It is part of the Compact 200 Series I/O subsystem. See Compact 200 Series I/O Subsystem Overview (PSS 41H-2COV).

　　Each discrete input is galvanically isolated from other channels and ground, and group isolated when used with external excitation. The modules perform signal conversion required to interface electrical input signals from field sensors to the redundant module Fieldbus. In addition, they may execute programs for Discrete Input, Ladder Logic, Pulse Count, and Sequence of Events, with configurable options of input filter time.

　　The modules can be used as a single unit, or as a redundant pair. 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 through a redundant adapter affixed to the Compact FBMs’ baseplate. The input current for redundant modules is doubled. A redundant digital input block in the Foxboro DCS control software validates each input in conjunction with information to/ from the module, and selects the input with the higher quality for processing in the control strategy.

　　A redundant contact input function block, CINR, is used for each 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 queried from each module, fully exercising the fieldbus and the logic circuitry of each module.

　　Compact Design

　　The Compact FBM207/b/c’s design is narrower than the Standard 200 Series FBMs, with a rugged Acrylonitrile Butadiene Styrene (ABS) exterior for physical protection of the circuits. Enclosures specially designed for mounting the FBMs provide various levels of environmental protection, up to harsh environments (Class G3), per ISA Standard S71.04.

　　Easy Removal/Replacement

　　The modules mount on a Compact 200 Series baseplate which is either DIN rail mounted or rack mounted horizontally, and includes signal connectors for redundant Fieldbus, redundant independent dc power, and termination cables. Two screws on each FBM fix the module to the Compact 200 Series baseplate.

　　Redundant modules must be located in adjacent positions on the baseplate, with the first module located in an odd-numbered position (for example, the positions labelled “3” and “4”). To achieve redundancy, a redundant adapter module is placed on the two adjacent baseplate termination cable connectors to provide termination for a single cable (see Compact FBM207/b/c Redundant Module Configuration, page 4). A single termination cable connects from the redundant adapter to the associated termination assembly (TA).

　　When redundant, either module may be replaced without upsetting field input signals to the good module. Each module can be removed/replaced without removing field termination cabling, power, or communications cabling.

　　Redundant Modules in Foxboro DCS HMI

　　The redundant pair of modules appear as two independent modules to system management software applications, such as Foxboro DCS System Manager, and System Manager/Display Handler (SMDH). The functional redundancy for these modules is provided by their associated control blocks.

　　Sequence of Events

　　The Sequence of Events (SOE) software package is used to acquire, store, display, and report events associated with a contact's change of state. System time is distributed to the FBM and the state change is marked with a precision of one millisecond. The contact signal may be passed through a debounce filter of variable period. System time is usually set by an optional master timekeeper receiving GPS time signals. This permits multiple control processors to be synchronized in time and therefore provide a consistent time basis for post-event analysis.

　　Refer to Sequence of Events in Related Product Documents, page 18 to learn more about this package, and to Time Synchronization Equipment for a description of the optional time synchronization capability. Also, for more information, refer to the section on “Timestamp Accuracy and Precision of SOE Data” in the Time Synchronization User's Guide (B0700AQ).

　　Fieldbus Communication

　　A Fieldbus Communications Module or a Control Processor interfaces to the redundant 2 Mbps module Fieldbus used by the FBMs. The FBM accepts communication from either path (A or B) of the 2 Mbps Fieldbus. If one path is unsuccessful or is switched off at the system level, the module continues communication over the active path.

　　Termination Assemblies and Cables

　　Field I/O signals connect to the FBM subsystem via DIN rail mounted termination assemblies (TAs). Multiple types of TAs are available with FBMs to provide passthrough I/O signal connections

　　The termination assembly can be used with a single Compact FBM207/b/c or with a redundant pair (two Compact FBM207/b/cs).

　　The DIN rail mounted termination assemblies connect to the FBM subsystem baseplate by means of removable termination cables. When used with a redundant module pair, the termination assembly is connected to the baseplate using a Compact FBM207/b/c redundant adapter (RH101AZ). The DIN rail mounted TAs connect to the redundant adapter by means of a removable termination cable

　　The cables for both single and redundant configurations are available in a variety of lengths, up to 30 meters (98 feet), allowing the termination assemblies to be mounted as needed by plant design. Refer to Termination Cable Types and Part Numbers, page 15 for termination cable part numbers and specifications.

　　Discrete Inputs

　　Termination assemblies with discrete inputs for the FBM207 support sixteen 2-wire discrete input signals at passive low voltage levels of less than 60 V dc and active high voltage levels of 125 V dc, 120 V ac, or 240 V ac. Active termination assemblies support input signal conditioning for FBMs. To condition signals, these termination assemblies may provide optical isolation, current limiting, noise reduction, voltage attenuation, or optional terminal blocks to connect externally supplied excitation voltage.

　　Termination assemblies with discrete contact sense inputs support sixteen 2-wire discrete input signals at passive low voltage levels of +24 V dc for the FBM207b and +48 V dc for the FBM207c.

　　Low Voltage Discrete Inputs

　　The low voltage inputs (less than 60 V dc) use passive termination assemblies. Inputs for FBM207 are voltage monitor types. Voltage monitor inputs require an external field voltage source.

　　Contact sense inputs use the FBM +24 V dc or +48 V dc supplied to all input channels on the assembly, to wet field contacts.

　　A load may not be required for proper operation of the input channels. A diode may be required for a dc inductive load only

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