ABB S800, Product Manual

Page: 32 / 186

Communication Section 2 Product Description
32 3BSE015969-600 A
The maximum length of the Optical ModuleBus expansion is dependent on the
number of ModuleBus modems. The maximum length between two clusters are
15 m (50 ft.) with plastic fibre and 200 m (656 ft) with HCS glass fiber, and 1000m
(3281ft) by using TB825 Optical Media Converter. The maximum fiber length
between two modems is 15m (50ft) with plastic fiber, 200m (656ft) with HCS fiber
and up to 5000m (20000m for S800 I/O HI) by using TB826 Optical Media
Converter. Factory made optical cables (plastic fibre) are available in lengths of 1.5,
5 and 15 m (5, 16.7 or 50 ft).
Within a cluster, the electrical ModuleBus is made up of increments integrated into
each MTU and S800L modules. Each communication interface module and Optical
ModuleBus Modem have a ModuleBus outlet connector to connect to an MTU or
S800L module. An MTU and S800L module has a bus inlet and a bus outlet
connector. By adding on the DIN-rail, an MTU or a S800L module to a ModuleBus
master or a ModuleBus Modem, the bus is automatically expanded up to a
maximum of 12 single MTUs (this number includes the number of S800L modules)
or 6 redundant MTUs. It is not allowed to mix single and redundant I/O modules
within a cluster. In a "Hot Replacement" configuration, you can install up to 6 I/O
modules on up to 6 redundant MTUs. The electrical ModuleBus can be divided-up
in sections by using Extension cables, refer
Figure 34 . The electrical ModuleBus
must not exceed 2.5 m (100”). The unique position codes are automatically
assigned to each MTU or S800L modules as the bus is expanded.
The Optional ModuleBus expansion can be built-up in three ways:
• simplex (ring) communication configuration. See Figure 10 .
• duplex communication configuration. See Figure 11 .