Model MCX-32
Model MCX-32 Instruction Manual
Rev. 2.3
Page 7 of 49
A
B
+
R
S
-4
8
5
V
D
C
P
O
R
T
1
O
u
t
A
B
R
S
-4
8
5
A
B
+
R
S
-4
8
5
V
D
C
P
O
R
T
2
O
u
t
Figure 4
RS-485 Wiring Terminals for PORT1, PORT2 and REMOTE
WARNING: Do not
attach more devices to the controller power supply than the power supply has the
capacity for, as damage may occur to the controller and will void the warranty. The capacity is
3Amps maximum. Modules and sensors attached to the controller that exceed this rating should be
powered by an external power supply capable of handling the extended load.
If the Remote Display option is installed, a set of terminals labeled “RS-485 REMOTE” is available for
connection to a remote display (Figure 4). If a remote display is included in the system configuration, connect
the RS-485 cable from the Remote Display to these terminals.
4.1 Analog 4-20mA Sensor Inputs (DA-4)
Connect 4-20mA type gas sensors to Model DA-4 4-20mA input modules. The DA-4 modules provide power
to any 2-wire or 3-wire field sensor and receive standard 4-20mA signal inputs from the sensors (See Figure
5).
4-20mA
INPUT
COMM
M
S
D
L
S
D
2-Wire 4-20mA Sensor
mA _ +
+
_ mA
3-Wire 4-20mA Sensor
Sensor 4
Sensor 3
Sensor 1
Sensor 2
mA
_
+
+
_ mA
Figure 5
Model DA-4 4-20mA Input Module and 4-20mA Gas Sensor Connections
There are four 4-20mA inputs in each DA-4 module to support up to four sensors (See Figure 6). DA-4
modules can be installed on the DIN rail of the controller. DA-4 modules can be connected to either Port 1 or
Port 2 of the controller.
