ABB 500 Series Builder's Manual page 102


96
Data communication modules
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The remote terminal communication modules can be used either for differential line
protection applications or for binary signal transfer of up to 32 signals in both directions
between, for example, distance protections. The following hardware modules are avail-
able:
• V35/36 contra-directional and co-directional
• X.21
• RS530/422 contra-directional and co-directional
• G.703
• Short-range galvanic module
• Fibre optical communication module
• Short-range fibre optical module
The galvanic data communication modules according to V35/36 DCM-V36 contra,
DCM-V36 co, X.21 DCM-X21, RS530/422 DCM-RS 530 contra, DCM-RS 530 co can
be used for galvanic short range communication covering distances up to 100 m in low
noise environments. Only contra-directional operation is recommended for best system
performance. These modules are designed for 64 kbit/s operation but can also be used
at 56 kbit/s.
The galvanic data communication module DCM-G.703 according to G.703 is not rec-
ommended for distances above 10 m. Special attention must be paid to avoid problems
due to noise interference. This module is designed only for 64 kbit/s operation.
The short-range galvanic module DCM-SGM can be used for communication over gal-
vanic pilot wires and can operate over distances of up to 3 km depending on pilot wire
cable. Twisted-pair or double-shielded cable is recommended.
The fibre optical communication module DCM-FOM can be used both with multi-
mode and single-mode fibres.The communication distance can typically be 40-60 km
for single mode fibre and typically 15-20 km for multi-mode fibre, and even further
with high quality fibre. This interface can also be used for direct connection with com-
munication equipment of type FOX 512/515 from ABB.
The short-range fibre optical module DCM-SFOM can only be used with multi-mode
fibre.The communication distance is normally 3 to 5 km. This module can also be used
for direct connection to optical/electrical communication converters of type 21-15xx
and 21-16xx from FIBERDATA
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