3.4.2
Connecting ESB Bus Fiber-Optic Cable
This section describes how to connect the safety control unit, the safety node unit, and the
unit for optical bus repeater module with the optical ESB bus repeater module mounted onto
each in order to extend the ESB bus using the fiber-optic cables.
There are star type and chain type connections.
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Types of Optical ESB Bus Repeater Module
The following models of optical ESB bus repeater modules are available:
•
SNT401 optical ESB bus repeater master module
•
SNT411 optical ESB bus repeater master module 5 km to 50 km (for SCSP2/SCSP1)
•
SNT501 optical ESB bus repeater slave module
•
SNT511 optical ESB bus repeater slave module 5 km to 50 km (for SCSP2/SCSP1)
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Transmission Distance
Combination of optical ESB bus repeater modules determines the transmission distance.
Table 3.4.2-1 Transmission Distance
Combinations
Each Stage
2 Stage Total
SNT401 and SNT501
Maximum 5 km
Maximum 10 km (SCSP2/SCSP1)
Maximum 5 km (SCSV1)
SNT411 and SNT511
Minimum 5 km
Maximum 50 km
5 km to 50 km
Mix of combination of SNT401 and
SNT501 and that of SNT411 and
SNT511
Stage with a combination
of SNT401 and SNT501:
maximum 5 km
Stage with a combination
of SNT411 and SNT511:
maximum 50 km
5 km to 50 km
IMPORTANT
With the SCSP2/SCSP1, the maximum extension length of the combinations “
SNT501” and “ SNT511” must be less than 50 km.
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ESB Bus Connection
Both ends of the modules connected with the ESB bus must be terminated. Use the following
modules for a terminator.
•
ESB Bus Coupler Module (SEC402/SEC401)
Both SEC401 and SEC402 have built-in terminators. The SEC401 and SEC402 can be
directly used at the end of the bus.
•
ESB Bus Interface Module (SSB401)
Two types exist: Branch connector with built-in ESB bus terminator and branch connector
without built-in ESB bus terminator. For a terminator, use the branch connector with built-
in ESB bus terminator.
•
Optical ESB Bus Repeater Master Module (SNT401/SNT411)
Two types exist: Branch connector with built-in ESB bus terminator and branch connector
without built-in ESB bus terminator. For a terminator, use the branch connector with the
built-in ESB bus terminator.
<3.4 Connecting ESB Bus Cable >
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IM 32Q06C10-31E
4th Edition : Jan.30,2015-00
