ABB S800 - Page 74

Fieldbus Communication Interface Section 2 Product Description
74 3BSE015969-600 A
Figure 27 shows the TB815 configured with two CI820 FCIs for redundant
operation.
Figure 28 shows the MTU TU847 (TU846) with redundant CI840. TU847 has one
ModuleBus and are used for single I/O modules. TU846 has two ModuleBuses and
are used for redundant I/O modules.
Figure 27. Redundant CI820 FCIs and TB815 Interconnection Unit Layout
Tx
Rx
M
O
D
U
L
E
B
U
S
SERVICE
SERVICE
SB
SA
L-
L+ L+
L-
STN. ADDR
FR
P
CI820
0
1
2
9
7
5
3
8
4
6
0
1
2
9
7
5
3
8
4
6
x 10
x 1
T1 T2
PR
DU
SB
SA
L-
L+ L+
L-
STN. ADDR
R
P
CI820
0
1
2
9
7
5
3
8
4
6
0
1
2
9
7
5
3
8
4
6
x 10
x 1
T2
DU
TB815
F
T1
PR
SWX.X/Y
SWX.X/Y
+
-
SH
SH
AF100
+
-
SH
SH
AF100