Technical data

40
1MRS751108-MUM
Protection Relay
Technical Reference Manual, General
REX 521
The LAG 1.4 default communication settings may be loaded by selecting Execute
from the HMI (Configuration\Communication\Comm.settings\LON
\Load def config.). 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.
1
From the front panel, the user should configure the Node number, the Subnet
number and the Bit rate in REX 521.
The LON bus event buffer includes 150 last events.
5.1.12.7. IEC 60870-5-103 bus
The REX 521 includes an unbalanced IEC 60870-5-103 slave communication
interface.
The interface provides a fixed cross-coupling between the REX 521 application
(indications, commands and protection equipment) and the IEC 60870-5-103
protocol application data. The adjustable parameters are Baud rate and Unit
address. User-selectable measurand sets Frame type are available for the
analog measurement values.
A051912
Fig. 5.1.12.7.-1 Example of the physical connection of the IEC 60870-5-103
control system
1. In order to succeed, the LON protocol has to be selected as the rear port protocol.
Star-coupler unit
e.g. RER 125
RS232C
REX 521
READY START TRIP
FEEDER PROTECTION
REX 521
READY START TRIP
FEEDER PROTECTION
REX 521
READY START TRIP
FEEDER PROTECTION
O
I
SPAC 331 C
IEC_103/SPA
gateway
SPACOM-relay
REX 521 and other IEC_103 based protection relays
Fibre-optic
modem
Monitoring and
control equipment
e.g. MicroSCADA