Foxboro P0916AE Compression Terminal Base

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 (for use with I/A Series® v8.x

software and Control Core Services v9.0 or later) is used for acquisition, storage,

display, and reporting of events associated with digital input points in a control system.

SOE, using the optional GPS based time synchronization capability, supports data

acquisition across control processors at intervals of up to one millisecond, depending

on the signal source.

Refer to Sequence of Events (PSS 31S-2SOE) to learn more about this package, and

to Time Synchronization Equipment (PSS 41H-4C2), for a description of the optional

time synchronization capability.

Foxboro DCS with software earlier than V8.x can support SOE through ECB6 and

EVENTblocks. However, these systems do not support GPS time synchronization

and use a timestamp sent by the Control Processor which is accurate to the nearest

second and does not provide synchronization between different Control Processors.

Fieldbus Communication

AFieldbus Communications Module or a Control Processor interfaces to the 2 Mbps

module Fieldbus used by the FBMs. The FBM217 accepts communication from either

path (A or B) of the 2 Mbps Fieldbus. If one path is unsuccessful or is switched at the

system level, the module continues communication over the active path.

Modular Baseplate Mounting

The module mounts on a DIN rail mounted baseplate, which accommodates up to four

or eight Fieldbus Modules. The Modular baseplate is either DIN rail mounted or rack

mounted, and includes signal connectors for redundant Fieldbus, redundant

independent DC power, and termination cables.

Redundant modules must be located in odd and even adjacent positions on the

baseplate (positions 1 and 2. 3 and 4. 5 and 6. or 7 and 8). To achieve the

redundancy, a redundant adapter module is placed on the two adjacent baseplate

termination cable connectors to provide a single termination cable connection. A

single termination cable connects from the redundant adapter to the associated TA.

To system configurator applications and monitoring through SMON, System Manager,

and SMDH,redundant modules appear to be separate, nonredundant modules. The

functional redundancy for these modules is provided by their associated control

blocks