ABB REX 521 Technical Reference Manual, General page 27

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Protection Relay
Technical Reference Manual, General
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In the system described in the figure above, communication is usually arranged as
shown in the table below.
Data type
Events and alarms
Control commands
Status of breakers and isolators
Analogue measurement values
Other DI, AI data
Other DO data
Parameter data
Disturbance recorder data
The LAG 1.4 default communication settings may be loaded by selecting the "Load
Default configuration" option from the front panel. This operation blanks the
internal EEPROM and boots the Neuron chip. Thereafter, the default
communication settings are loaded and stored into the Neuron chip. This operation
takes approximately 15 seconds according to LAG 1.4.
From the front panel, the user should configure the "Node number", the "Subnet
number" and the "Bit rate" of the REX 521 device.
The LON bus event buffer includes 150 last events.
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REX MicroSCADA
sliding window protocol
sliding window protocol
transparent SPA bus messages
sliding window protocol
sliding window protocol
sliding window protocol
transparent SPA bus messages
transparent SPA bus messages
file transfer over the LON network
REX 521
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