SNB10D
SNB10D
SSC10S/SSC10D
Fiber-Optic
cable
Fiber-Optic
cable
Fiber-Optic
cable
SEC401
SNT401
SNT501
SSB401
BUS 2
BUS 1
BUS 2
BUS 2
BUS 2
BUS 1
BUS 1
BUS 1
ESB bus
ESB bus
ESB bus
ESB bus
SNT501
SSB401
BUS 2
BUS 1
ESB bus
SNT10D
: Connector unit with terminator for ESB bus
Note: Max. five SNB10Ds are connectable to one SNT10D.
Figure 3.4.2-1 Example of Star Type Connection
n
Chain Type Connection
For the chain type connection, two methods are available: Using safety control unit and safety
node unit; using unit for optical bus repeater module. The optical ESB bus repeater module
must always be duplicated.
l
Using Safety Control Unit and Safety Node Unit
This is the method in which required the optical ESB bus repeater modules are mounted onto
safety control unit and safety node unit each. Both ends of the ESB bus should be terminated
on each level. The following figure shows an example of this connection.
Mount the ESB bus coupler module (SEC401) and the optical ESB bus repeater master mod-
ule (SNT401) on the safety control unit (SSC10S/SSC10D) with the ESB bus.
Mount the ESB bus interface module (SSB401), the optical ESB bus repeater master module
(SNT401), and the optical ESB bus repeater slave module (SNT501) on the safety node unit
(SNB10D) with the ESB bus.
Mount the ESB bus interface module (SSB401) and the optical ESB bus repeater slave mod-
ule (SNT501) on the lowest-level safety node unit (SNB10D) with the ESB bus.
For the modules at the end of ESB bus, use a connector unit with terminator for ESB bus.
Connect the optical ESB bus repeater modules (SNT401 and SNT501) with fiber-optic cables.
<3.4 Connecting ESB Bus Cable >
3-24
IM 32Q06C10-31E
4th Edition : Jan.30,2015-00
