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asked Jul 7 in Engineering by wozniakmic (3,460 points)

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answered Jul 7 by wozniakmic (3,460 points)

FISCO - Fieldbus Intrinsic Safe Concept.  Allows more power to an IS segment for approved FISCO devices, allowing for more devices per IS segment.

FNICO - Fieldbus Nonincendive Concept.  Allows more power to a Fieldbus segment, thus allowing for more devices per IS segment.

HIST - Host Interoperability Support Test.  Voluntary testing is performed by the Fieldbus Foundation to indicate functions or features available with a host.  There are 18 different features evaluated.  If present, these features must be implemented in a way that conforms to the FF specifications.

ITK - Interoperability Test Kit used by the Foundation to tick mark devices and confirms compliance with the relevant Foundation Fieldbus standards.  This is a pass/fail test.  Only devices passing the full suite of tests receive the FF "tick mark."

Link Active Scheduler (LAS) - A Link Active Scheduler (LAS) is a deterministic, centralized bus scheduler that maintains a list of transmission times for all data buffers in all devices that need to be cyclically transmitted.  Only one Link Master (LM) device on an H1 Fieldbus Link can be functioning as that link's LAS. 

Link Master (LM) - A Link Master (LM) is any device containing Link Active Scheduler (LAS) functionality that can control communications on an H1 Fieldbus Link.  There must be at least one LM on an H1 Link; one of those LM devices will be elected to serve as LAS. 

Virtual Field Device (VFD) - A Virtual Field Device (VFD) is used to remotely view local device data described in the object dictionary.  A typical device will have at least two Virtual Field Devices (VFDs).

Standard Function Block (FB) - Standard Function Blocks (FBs) are built into Fieldbus devices as needed to achieve the desired control functionality.  Automation functions provided by Standard FBs include Analog Input (AI), Analog Output (AO), and Proportional/Integral/Derivative (PID) control.  The Fieldbus Foundation™ has released specifications for 21 types of Standard FBs.  There can be many types of FBs in a device.  The order and definition of Standard FB parameters are fixed and defined by the specifications. 

Transducer Block (TB) - A Transducer Block (TB) decouples Function Blocks (FBs) from the local Input/Output (I/O) functions required to read sensors and command output hardware.  Transducer Blocks (TBs) contain information such as calibration date and sensor type.  There is usually one TB channel for each input or output of a Function Block (FB).