ABB Relion REG670, Technical Manual

Page: 1162 / 1298

21.2.7 Binary input module (BIM)
21.2.7.1 Introduction
The binary input module has 16 optically isolated inputs and is available in two
versions, one standard and one with enhanced pulse counting capabilities on the inputs
to be used with the pulse counter function. The binary inputs are freely programmable
and can be used for the input of logical signals to any of the functions. They can also
be included in the disturbance recording and event-recording functions. This enables
extensive monitoring and evaluation of operation of the IED and for all associated
electrical circuits.
21.2.7.2 Design
The Binary input module contains 16 optical isolated binary inputs. The voltage level
of the binary input is selected at order.
For configuration of the input signals, refer to section "Signal matrix for binary inputs
SMBI" .
A signal discriminator detects and blocks oscillating signals. When blocked, a
hysteresis function may be set to release the input at a chosen frequency, making it
possible to use the input for pulse counting. The blocking frequency may also be set.
Well defined input high and input low voltages ensure normal operation at battery
supply earth faults, see figure
526 The figure shows the typical operating
characteristics of the binary inputs of the four voltage levels.
The standard version of binary inputs gives an improved capability to withstand
disturbances and should generally be used when pulse counting is not required. Inputs
are debounced by software.
I/O events are time stamped locally on each module for minimum time deviance and
stored by the event recorder if present.
Section 21
1MRK502052-UEN B
IED hardware
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Technical manual