Control functions
The control functions are used to indicate the status of switching devices,
i.e. circuit breakers and disconnectors, and to execute open and close commands for controllable switching devices of the switchgear.
Furthermore, there are supplementary functions for control logic purposes, e.g. on/off switches,
MIMIC alarm LED control, numerical data for MIMIC and logic controlled control position selector.
The control functions configured with the Relay Configuration Tool can be associated with object status indicators that
are part of the MIMIC configuration picture displayed on the HMI.
The object status indicators are used to indicate the status of switching devices via the MIMIC picture and to control them locally.
Technical Description
Functional description
Functions of the machine terminal
The functions of REM 54_ machine terminal are categorized as:
• protection functions
• measurement functions
• control functions
• condition monitoring functions
• communication functions
• general functions
• standard functions
The functions are further divided to two subsets that correspond to different
functionality levels (refer to section “Ordering Information” on page 91).

Document conventions
A particular convention may not be used in this manual.
• Abbreviations and acronyms are spelled out in the glossary. The glossary also
contains definitions of important terms.
• Parameter names are shown in italics.
The function can be enabled and disabled with the Operation setting.
• Parameter values are indicated with quotation marks.
The corresponding parameter values are "On" and "Off".
• Input/output messages and monitored data names are shown in Courier font.
The installation manual contains instructions on how to install the mounting assembly
with pre-wired terminals. The manual provides procedures for mechanical and electrical installation.
The chapters are organized in chronological order in which REX521RRP should be installed.
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