ABB Symphony Harmony Series, Instruction, Page: 103 / 402

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Document Conventions
Document Conventions
The ? in a nomenclature or part number indicates a variable
for that position (e.g., 1949480?1). In a part number and doc-
ument number, the ? is a place holder for the revision letter.
Glossary of Terms and Abbreviations
Table 1-3 is a glossary of terms and abbreviations used in the
instruction. It contains those terms and abbreviations that are
unique to ABB Automation or have a definition that is different
from standard industry usage.
Table 1-3. Glossary of Terms and Abbreviations
Term Definition
Auxiliary block I/O system device that enhances I/O block capabilities.
Base Mounting base for a block. For I/O blocks it supports screw terminals,
clamp terminals, or cable connection of field wiring.
BRC Harmony bridge controller.
Channel label Optional name (i.e., character string) assigned to an I/O channel.
Device label Name (i.e., character string) assigned to an I/O block. The device label
identifies a block instead of a hardware address.
Exception report Information update generated when the status or value of a point
changes by more than a specified significant amount.
Function code (FC) An algorithm that manipulates specific functions. These functions are
linked together to form the control strategy.
HAC Harmony area controller.
Harmony network
(Hnet) Redundant serial communications system that allows data to be trans-
mitted between Harmony devices.
I/O block Generic name for a processor based Harmony input/output device:
AIN-120, AOT-150, DIO-400, etc.; comprised of an I/O module and a
base.
I/O expander bus Parallel communication bus between the Harmony controller and rack
I/O.
I/O module Houses the I/O block circuitry that processes inputs and outputs; part of
an I/O block.
Machine fault time
(MFT) Reset by the block processor during normal operation. If not reset regu-
larly, the MFT times out and the I/O block stops.
Module mounting unit
(MMU) Card cage that provides electrical and communication support for
Harmony rack I/O.