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Mounting and installation, Technical Description, T 811 086 en e
10.3.9
BX-REL4 relay module connection
There are four potential-free relay outputs available for switching loads up to 2 A and up to 230 V. All relays are bistable
changeover contacts and each one has a screw terminal for the normally closed contact and normally open contact. For
e
ach output an “Active in Fail-Safe-Position” can be programmed in the event of loop voltage failure.
Further information about the BX-REL4 can be found in data sheet T 811 121.
GND
SHLD
SHLD
GND
L1
L2
X5
BX-REL4
1
NC1
NC2
NC3
NC4
NO1
NO2
NO3
NO4
COM1
COM2
COM3
COM4
X1
X2
X3
X4
Example 1:
actuation with own
voltage supply
e.g. sirens
Example 2:
actuation as
standby contact
e.g. control electronics
Example 3:
actuation with external
voltage supply
e.g. ventilation motor
Power supply unit
-
+
External
power
supply
M
Elevator
control
+
-
S
H
L
D
S
H
L
D
L
1
L
2
G
N
D
G
N
D
Fig. 137 BX-REL4, relay module connection
10.3.10 BX-IOM input/output module connection
The BX-IOM has a galvanically isolated output for actuating monitored consumers (e.g. sirens) which are supplied by exter-
nal voltage sources. The input can be used to poll potential-bound voltage sources. The monitored output is divided into
three load ranges and can actuate and monitor a load between 20
Ω and 1 kΩ.
Further information about the BX-IOM can be found in the data sheet T 811 125.
GND
SHLD
SHLD
GND
L1
L2
X2
IM1+
VEXT
OM1+
IM1-
1
X1
BX-IOM
1
OM1-
External
power
supply
-
+
-
+
Input
E
le
c
tr
o
n
ic
s
ir
e
n
Output
control
1k
L1
L2
G
N
D
G
N
D
SH
LD
SH
LD
Fig. 138 BX-IOM, consumer with external voltage monitoring