3. Cabling
3-84
TI 32P01J10-01EN
Chain Type Connection
There are two structures of chain type connections: one uses the SNT10D Unit for Optical Bus
Repeater Modules and the other does not use any SNT10D Unit for Optical Bus Repeater
Modules.
W
here No SNT10D Unit Is Used
The SNT401/SNT411 modules installed on the S2SC70
/SSC60
/SSC50
/SSC57
Safety
Control Unit as well as on the SNB10D Safety Node Unit can be chain-connected respectively
to SNT501/SNT511 modules installed on the SNB10D Unit. In such a case, the number of I/O
modules that can be installed on SSC60
/SSC50
/SSC57
and SNB10D is up to four and six
respectively. If you have a plan to connect an SNB10D and your SNB10D with fiber-optic cables
in the future, it is recommended that you reserve sufficient slots in your SNB10D for optical ESB
bus repeater modules.
Example of not using SNT10D
S
N
T
4
0
1
S
S
B
4
0
1
: A bold frame shows a module with terminator.
F030811.ai
: Fiber-optic cable
Wiring with ESB bus and Fiber-optic cable
CN2
CN1
CN2
CN1
SNT401 SNT401
SNT501 SNT501
SNT501 SNT501
SNT401 SNT401 SEC402 SEC402
SSB401 SSB401
SSB401 SSB401
SNB10D
I
O
M
I
O
M
I
O
M
I
O
M
I
O
M
I
O
M
S
N
T
5
0
1
S
N
T
5
0
1
P
S
U
P
S
U
S
S
B
4
0
1
S
S
B
4
0
1
SNB10D
I
O
M
I
O
M
I
O
M
I
O
M
P
S
U
P
S
U
S
N
T
5
0
1
S
N
T
5
0
1
S
N
T
4
0
1
S
N
T
4
0
1
S
S
B
4
0
1
S
S
B
4
0
1
S2SC70D
I
O
M
I
O
M
I
O
M
I
O
M
S
E
C
4
0
2
S
E
C
4
0
2
S
C
P
4
6
1
S
C
P
4
6
1
P
S
U
P
S
U
S
N
T
4
0
1
S
N
T
4
0
1
ESB bus
ESB bus
Total length of
Fiber-optic cable
Fiber-optic
cable
Fiber-optic
cable
Figure Chain Type Connections: Not Using SNT10D
Nov. 27, 2015-00