164
6
F
2
S
0
8
5
0
3.1.4.2 IO2
Module
As shown in Figure 3.1.4.2, the IO2 module incorporates 3 photo-coupler circuits (BI) for binary
input signals, 14 auxiliary relays (13 BOs and FAIL) for binary output signals and an RS485
transceiver.
The auxiliary relay FAIL has one normally closed contact, and operates when a relay failure or
abnormality in the DC circuit is detected. Each BO has one normally open contact. BO13 is a
high-speed operation type.
The RS485 is used for the link with communication system such as RSM (Relay Setting and
Monitoring) or IEC60870-5-103 etc. The external signal is isolated from the relay internal
signal.
Auxiliary relay
RS-485
IO2 module
BI
BI
BI
Binary
output
signals
Binary
input
signals
Photo-coupler
BO
FAIL
BO13
BO
(
×
3)
(BO
×
13,
FAIL
×
1)
Link with serial
communication
system such as
RSM or
IEC103, etc.
Figure 3.1.4.2 IO2 Module
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