Reading Of The Overview Diagrams Of The Signal Routings; Digital Inputs - ABB REX 521 Technical Reference Manual, Standard Configurations

1MRS 751802-MUM
4.
Digital
PREDELAY
inputs
DI1
.
INVERSION
.
.
DI9
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4.1.
Protection Relay
Technical Reference Manual, Standard Configurations
Reading of the overview diagrams of the signal
routings
The signals in a standard configuration can be programmed to perform various
functions. Digital inputs can be connected to the different input signals (e.g.
Blocking 1) by using selectors. Input signals can be routed to output relays (e.g.
HSPO1) directly or they can be connected via the input switchgroups to inputs of the
function block in order to perform different kinds of functions. This is done by
setting the value of the input switchgroups.
Output signals of the function blocks can be connected to the output relays by first
selecting the needed output signals from the function blocks e.g. Trip 1 (3I>, 3I>>
etc.) by the output switchgroups and then connecting the selected group of signals
to the dedicated output relays by setting the "Output signal" selector.
Analogue signals are connected to the corresponding protection and measurement
function blocks. Analogue signals are not presented in the overview diagrams of the
signal routings.
Selectors
Input
Signals
Master trip
External trip
Reset 1
Reset 2 Input
Group SWGRP
Blocking 1
. Blocking 1
.
BS1 3I>
.
BS1 3I>>
etc.
BS1 3I>>>
BS1 Io>->
BS1 Io>>->
BS1 Io>>>>->
BS1 Iub
Blocking 2
etc.

Digital inputs

Digital inputs (DI1...DI9) can be connected to the inputs of the function block in
order to obtain different functionalities. For example, digital inputs are used for
performing blocking of protection, external triggering of disturbance recorder and
local control.
Any of the digital inputs (DI1...DI9) can be programmed from menu selection to
invert the signal and to set the predelay (filtering). For more information, refer to
chapter 4.1.5. "Digital inputs" in Technical Reference Manual, General
(1MRS 751108-MUM).
The routings between the digital inputs and different functionalities are set with
selectors and switchgroups (SWGRP) for each functionality respectively. Settings
are done with the Human-Machine Interface (HMI) or with the Relay Setting Tool.
Function Output
block SWGRP
3I> Trip 1
3I>
CBFP
3I>>
BS1
3I>>>
BS2
START Io>-->
GROUP
TRIP Io>>-->
RESET CBFP Io>>>-->
Iub>
3I>>
3Ith>
Trip 2
CBFP
etc.
etc.
REX 521
Output
relays
HSPO 1
PO1
Selectors
PO2
Output
.
signals
.
.
Trip 1
HSPO1
etc.
Trip 2
PO1
PO2
PO3
.
.
.
etc.
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