ABB REX 521 Technical Reference Manual, General

1MRS 751108-MUM
REX 521
31
Protection Relay
Technical Reference Manual, General
4.1.12. Serial communication
The protection relay has two serial communication ports, one on the front panel and
the other on the rear panel.
The connector located on the front panel is a standard ABB optical connector that is
intended to be used for setting the parameters of the protection relay. During the
transmission of the parameters, an interface cable is connected between the relay and
the standard RS-232 interface of a PC, running the Relay Setting Tool.
On the rear panel, there is a fibre-optic interface used to connect the protection relay
to a distribution automation system via SPA, LON, IEC 60870-5-103, Modbus or
DNP 3.0 bus.
There is also an isolated RS-485 connection (twisted pair) available for SPA,
Modbus and DNP 3.0 communication in connector X3.1:9,10. For the location of
the RS-485 connection on the rear panel, see “Terminal connections” on page 53.
The connection is marked with texts “Data A” and “Data B” on the panel.
The following table describes the combinations of different communication
protocols and the physical interfaces that can be used at the same time (X = in use).
INTERNAL FAULT
IRF error (test)
60 Protection operative
INTERNAL FAULT
Overtemperature
80 Protection operative. The relay has detected an excessive
temperature. May be due to an ambient temperature above
the specified operating limit or an internal fault.
INTERNAL FAULT
Voltage low 24V
131 Protection operative. Output relays do not operate within
specified limits.
INTERNAL FAULT
Volt. high +15V
203 Protection inoperative
INTERNAL FAULT
Volt. high -15V
223 Protection inoperative
INTERNAL FAULT
A/D conversion
253 Protection inoperative
INTERNAL FAULT
Start-up
- Protection inoperative. No communication started, menu
navigation disabled.
INTERNAL FAULT
Unspecified
255 Protection operative or inoperative. The fault location cannot
be determined.
Table 4.1.11.2-1 Fault indications (Continued)
Fault indication
Fault
code
Reason/Action
Table 4.1.12-1 Protocol combinations and physical interfaces
Protocol Rear port (Optical) Rear port (RS-485)
Front connector
(SPA only)
SPA X X
SPA X X
LON X X
IEC_103 X X
Modbus X X
Modbus X X
DNP 3.0 X X
DNP 3.0 X X

ABB REX 521 Specifications

General

Brand	ABB
Model	REX 521
Category	Other
Language	English