Revision 1.0 SMV800 Modbus User's Guide Page vii
Terms and Acronyms
The detection of a block leaving a state and when it returns to that state.
Analog Input (function
block)
One of the standard function blocks define by the Foundation Modbus
A software program that interacts with blocks, events and objects. One
application may interface with other applications or contain more than one
application.
A logical software unit that makes up one named copy of a block and the
associated parameters its block type specifies. It can be a resource block,
transducer block or a function block.
Configuration (of a
system or device)
A step-in system design: selecting functional units, assigning their locations
and identifiers, and defining their interconnections.
A physical entity capable of performing one or more specific functions.
Examples include transmitters, actuators, controllers, operator interfaces.
Description of FBAPs within a device. Files that describe the software objects
in a device, such as function blocks and parameters. The DD binary are
created by passing DD source files through a standard tool called a tokenizer.
Device Description
Language
A standardized programming language (similar to C) used to write device
description source files.
The Physical Device Tag of the device as specified in the Foundation Modbus
specifications.
Electrically Erasable Programmable Read Only Memory
Electromagnetic Interference
An instantaneous occurrence that is significant to scheduling block execution
and to the operational (event) view of the application.
A Modbus-compatible device that contains and executes function blocks.
Field Termination Assembly
An executable software object that performs a specific task, such as
measurement or control, with inputs and outputs that connect to other function
blocks in a standard way.
Function Block
Application Process
The part of the device software that executes the blocks (function, transducer,
or resource blocks).
High Pressure (also, High Pressure side of a Differential Pressure Transmitter)
A device which is responsible for keeping a link operational. The LAS executes
the link schedule, circulates tokens, distributes time messages and probes for
new devices.
Low Pressure (also, Low Pressure side of a Differential Pressure Transmitter)
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