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19.2.12 Binary input/output module (IOM)
19.2.12.1 Introduction
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 signaling
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.
19.2.12.2 Design
The binary input/output module is available in two basic versions, one with
unprotected contacts and one with MOV (Metal Oxide Varistor) protected contacts.
Inputs are designed to allow oxide burn-off from connected contacts, and increase the
disturbance immunity during normal protection operate times. This is achieved with a
high peak inrush current while having a low steady-state current, see figure
519 . Inputs
are debounced by software.
Well defined input high and input low voltages ensures normal operation at battery
supply ground faults, see figure
518 .
The voltage level of the inputs is selected when ordering.
I/O events are time stamped locally on each module for minimum time deviance and
stored by the event recorder if present.
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, see
figure
527 .
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.
For configuration of the input and output signals, refer to sections "Signal matrix for
binary inputs SMBI" and "Signal matrix for binary outputs SMBO" .
The making capacity of the reed relays are limited.
Section 19
1MRK505222-UUS C
IED hardware
1110
Technical reference manual