Emerson MRLDS - Manual (Page 11)

Network Layout MRLDS Modbus Version (809-101x) • 5
3.4.3 RMCC Controllers
For RMCC-type controllers, set the Gain parameter to
250 and Offset to -1000.
4 MRLDS Modbus
Version (809-101x)
4.1 Network Layout
4.2 MRLDS Setup
4.2.1 MRLDS Wiring
4.2.2 MRLDS Network Addressing
Modbus network settings are set on jumpers J5, J4,
and J3. Refer to Table 4-1 (also included on the inside
label of the MRLDS) for network addressing with corre-
sponding jumper settings.
If more than one MRLDS is on the network, each unit
must have a unique address and be numbered according to
the inside label (Table 4-1) specifications.
Figure 3-4 - Analog Input Screen Settings Example for E2
Figure 4-1 - Network Layout Example
E2
Gateway
MRLDS
MRLDS
MRLDS
MRLDS
I/O Net
+ -
+
-
-
-
-
-
+
+
+
+
MODBUS
(Up to 12 MRLDS
units on the network
per Gateway)
Figure 4-2 - Modbus MRLDS Wiring
Figure 4-3 - MRLDS Jumpers (Inside Lower Portion of Cover)
R
S
4
8
5
(
+
)
R
S
4
8
5
(-
)
A
C
N
2
4
V
A
C
MRLDS - INSIDE LOWER
PORTION OF BASE
E
A
R
T
H
G
N
D
Shield
drain/ground
wire
MODBUS
NETWORK
To Gateway
Board
A transformer must
be shared
between MRLDS
and the Gateway
board. A
must
be used.
If a transformer is
shared between
MRLDS units,
the “ACN” of
each MRLDS
must be wired
to the same
phase of the
transformer.
never
separate
transformer
MODBUS
BELDEN
8761
14 AWG less
than 6 inches
J6 J5 J4 J3 J2 J1
refrigerant
type
jumpers network
address
jumpers term
jumper
J6 J1