ABB DCS 400 - 7.3 Fieldbus interface

II K 7-8
Serial Interfaces
SDCS-CON-3
GND
+24 V/≤ 150 mA
Nxxx-01
xxxx xxxx
ADAPTER
BUS
TERMINATION
ON
OFF
RXD
TXD
PE SHF DG D(N ) D (P)
X1
X2
PE SHF
DG
D(N) D(P)SH
XMI T
REC
ERROR
+24V
0V SH
+24V 0V
'&6
1
2
X8
RxDTxD
E
O
X
H
E
O
X
H
J
U
H
\
J
U
H
\
Fieldbus cable
7.3 Fieldbus interface
For connection to external control devices, like PLCs,
typically the third serial interface, "fieldbus interface"
is used.
Several fieldbus protocol specific adapters are avail-
able as options for the DCS 400. The following de-
scription is an overview. Detailed information is avail-
able from the specific adapter descriptions.
Characteristics:
• Fieldbus adapter is mounted on external mounting
rail
• Power supply from DCS 400 (built-in)
• Connection between adapter and DCS 400 is
optical cable
• DCS 400 automatically detects the connected
fieldbus type
• Therefore, the user specific paramter settings are
drastically reduced
User specific parameters like e.g. station addresses
or Modbus settings are only set once, during the
commissioning.
Short Commissioning Guide
• Switch Off DCS 400 electronics power supply.
• Mount fieldbus adapter on mounting rail.
• Connect adapter to power supply (X8).
• Connect optical cables from adapter to DCS 400
(V800).
• Connect fieldbus cable to fieldbus adapter.
• Switch On DCS 400 electronics power supply.
• Wait approximately 10 s.
During this time an initialization is done between
fieldbus adapter and DCS 400. Most of fieldbus
parameter are pre-defined by the fieldbus adapt-
er automatically after that procedure.
• Set Fieldbus Par 1 (8.01) (Module Type) = Field-
bus.
• Set user specific parameters. For detailed descrip-
tion, refer to the description which is following the
fieldbus adapaters.
• Wait 10 s.
• Switch Off and On again the electronics power
supply, in order to re-initialize the user specific
parameter settings, which have been changed to
include the serial communications.
The communication parameters Cmd Location (2.02),
Comm Fault Mode (2.07) and Comm Fault Time
(2.08) need to be set manually, for the purpose of
communication supervision. See chapter about com-
munication parameters earlier in this document.
Fig: 7.3/1 Connection of a Fieldbus Adapter to DCS 400
and PLC
Fig.: 7.3/2 Connection of Fieldbus Adapter to DCS 400
Nxxx-01
xxxxxxxx
ADAPTER
BUS
TER MI NA TI ON
ON
OFF
RXD
TXD
PE SH F D G D (N ) D (P )
X1
X2
PE SH F D G D (N ) D (P )SH
XMIT
REC
ERROR
+24V 0V SH
optical fibre
24 V supply
Fieldbus cable
DCS 400
PLC
Fieldbus
A