ABB REF 54 Series Technical Reference Manual page 63

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Technical Reference Manual, General
The IEC_103 protocol is used for the optical serial communication network using
the RER 123 module connected to the X3.2 connector.
The SPA address and the Subnet/Node number on the LON are used for identifying
the device from the protocol point of view and they are independent of each other.
For more information, see Table 4.2.1-11 on page 78.
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When SPA is used, the rear side communication is not stopped when the front
connector is "active". This enables e.g. uploading the disturbance records without
affecting the communication to upper level.
Moreover, if LON is selected as a communication protocol and the front connector
is "active", transparent SPA write commands are not inhibited via the LON bus.
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The system very often resembles the system in the figure below. The protection,
control or alarm functions are implemented by using REF 54_ feeder terminals,
SPACOM units or other SPA bus devices (devices connected to the system via the
SPA bus). Generator or motor feeders are protected and controlled with REF 54_
feeder terminals. LON devices made by other manufacturers or other ABB
companies may be used for various DI, AI and DO functions. MicroSCADA is used
for remote control.
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1. Parallel communication is restricted in releases prior to Release 2.0, refer to section
"Release 2.0" on page 92.
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