ABB LevelMaster 7100, Руководство пользователя, Страница: 40 / 100

LevelMaster 7100 User manual 2105835 Rev AA | 30
Figure 26: Two-LevelMaster RS-485 bus of same board type using single communication contact pair
Figure 27 displays wiring between two LevelMasters with different board types. The first LevelMaster is the intermediate sensor
on the bus. The additional LevelMaster, with a legacy board, is the last sensor on the bus and must be configured to terminate
the bus (JP1 jumpers are placed on 5-6, 7-8 and 9-10 as indicated in section 4.1.3,
Onboard termination jumpers (legacy boards
only).
2
1
JP1
J1
V
-
V
+
T
-
T
+
D9
J12
1
3
J11
POWER
EARTH
T- T- T+ T+
- +
R
+
R
-
Legacy electronic board
(2018546-005)
New electronic board
(2104836-001)
Intermediate sensor on RS485 bus Last sensor on RS485 bus
B
u
s
(-
)
B
u
s
(+
)
G
N
D
P
W
R
To host controller and power source:
1) Direct connection or
2) Through barrier
Figure 27: Two-LevelMaster RS-485 bus (mixed board type)
IMPORTANT NOTE: When wiring from the LevelMaster to the host controller, do not cut off spare wires. Tape
them securely back to the cable jacket as spares, in case of damage.