ABB Relion 670 series - Galvanic RS485 communication module; Introduction; Design

Table 705: SLM – SPA/IEC 60870-5-103/DNP3 port
Quantity Range or value
Optical connector Glass fiber: type ST
Plastic fiber: type HFBR snap-in
Fiber, optical budget Glass fiber: 11 dB (3000ft/1000 m typically *)
Plastic fiber: 7 dB (80ft/25 m typically *)
diameter Glass fiber: 62.5/125 mm
Plastic fiber: 1 mm
*) depending on optical budget calculation
19.2.15 Galvanic RS485 communication module
19.2.15.1 Introduction
The Galvanic RS485 communication module (RS485) is used for DNP3.0
communication. The module has one RS485 communication port. The RS485 is a
balanced serial communication that can be used either in 2-wire or 4-wire connections.
A 2-wire connection uses the same signal for RX and TX and is a multidrop
communication with no dedicated Master or slave. This variant requires however a
control of the output. The 4-wire connection has separated signals for RX and TX
multidrop communication with a dedicated Master and the rest are slaves. No special
control signal is needed in this case.
19.2.15.2 Design
The RS485 is a PMC card and it is factory mounted as a mezzanine card on the NUM
module. The internal structure of the RS485 can be seen in figure
532:
PCI-con
32 MHz
UART
Tx
Rx
Isolation
Isolation
Isolation
Isolated
DC/DC
RS485
tranceiver
PCI-bus
ID-chip
FPGA
PCI-
Controller
Local bus
to
wishbone
Status
Register
Termination
Control
Register
Info
Register
Soft
ground
Internal
bus
PCI-con
2-pole
connector
Wishbone interconnect switch
6-pole-connector
IEC06000516 V1 EN
Figure 532: The internal structure of the RS485 card
1MRK505222-UUS C Section 19
IED hardware
1119
Technical reference manual