Serial Communication - ABB REX 521 Technical Reference Manual, General

1MRS 751108-MUM
4.1.12.
Protection Relay
Technical Reference Manual, General
Table 4.1.11.2-1 Fault indications (Continued)
Fault
Fault indication
code
INTERNAL FAULT 60
IRF error (test)
INTERNAL FAULT 80
Overtemperature
INTERNAL FAULT 131
Voltage low 24V
INTERNAL FAULT 203
Volt. high +15V
INTERNAL FAULT 223
Volt. high -15V
INTERNAL FAULT 253
A/D conversion
INTERNAL FAULT -
Start-up
INTERNAL FAULT 255
Unspecified

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).
Table 4.1.12-1 Protocol combinations and physical interfaces
Protocol Rear port (Optical)
SPA
SPA
LON
IEC_103
Modbus
Modbus
DNP 3.0
DNP 3.0
Reason/Action
Protection operative
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.
Protection operative. Output relays do not operate within
specified limits.
Protection inoperative
Protection inoperative
Protection inoperative
Protection inoperative. No communication started, menu
navigation disabled.
Protection operative or inoperative. The fault location cannot
be determined.
Rear port (RS-485)
X
X
X
X
X
REX 521
Front connector
(SPA only)
X
X X
X
X
X
X X
X
X X
31