I/O Module (Iom); Application; Design; Function Block - ABB REL 551-C1*2.5 Technical Reference Manual

5
5.1
5.2
5.3

I/O module (IOM)

I/O module (IOM)

Application

The binary input/output module is used when only a few input and output channels are needed.
The ten standard output channels are used for trip output or any signalling purpose. The two high
speed signal output channels are used for applications where short operating time is essential.
Eight optically isolated binary inputs cater for required binary input information.

Design

The binary I/O module, IOM, has eight optically isolated inputs and ten output relays. One of
the outputs has a change-over contact. The nine remaining output contacts are connected in two
groups. One group has five contacts with a common and the other group has four contacts with
a common, to be used as single-output channels.
The binary I/O module also has two high speed output channels where a reed relay is connected
in parallel to the standard output relay.
Note!
The making capacity of the reed relays are limited.

Function block

IOM
POSITION ERROR
BO1 BI1
BI2
BO2
BI3
BO3
BO4 BI4
BO5 BI5
BI6
BO6
BO7 BI7
BO8 BI8
BO9
BO10
BO11
BO12
BLKOUT
BONAME01
BONAME02
BONAME03
Figure 34: I/O module
BONAME04
BONAME05
BONAME06
BONAME07
BONAME08
BONAME09
BONAME10
BONAME11
BONAME12
BINAME01
BINAME02
BINAME03
BINAME04
BINAME05
BINAME06
BINAME07
BINAME08
xx00000157.vsd
Chapter 10
Hardware modules
143