21
Unit Components
Section 2-1
2-1-4
PROFIBUS Connector
The PROFIBUS connector on the font of the Unit is a 9-pin female sub-D con-
nector, as recommended by the PROFIBUS standard EN50170.
The signal RTS (TTL signal) is for the direction control of repeaters, which do
not have a self-controlling capability.
The signals DGND and VP are used to power the bus terminator located in
the cable connector.
Note
1.
The orientation of the sub-D connector allows the use of PROFIBUS con-
nectors with a 90° angle cable outlet, e.g ERNI, Delconec and Phoenix.
2.
The 9-pin sub-D connector uses #4/40 UNC thread for mechanical fixation
of the cable connector. Make sure that if non-standard PROFIBUS con-
nectors are used, the same thread is used on the cable connector.
3.
PROFIBUS-DP Baud rate setting is accomplished through automatic de-
tection, all the defined PROFIBUS-DP baud rate values are supported.
2-1-5
Host Link / Compoway-F Connector
The Host Link/Compoway-F interface is a dedicated RS-422/RS-485 compli-
ant interface, and this interface is galvanically isolated. The PROFIBUS-DP
Gateway Unit has a switch on the front case, allowing the user to select either
the RS-422 or the RS-485 physical layer. The Unit also provides a switch to
turn a 220 Ohm termination resistor ON or OFF The termination resistor is
placed inside the Unit and between the two receiver lines of either RS-422 or
RS-485.
Address setting
The Host Link / Compoway-F interface does not require a separate address
setting feature. All connected devices must have addresses selected in the
range of 1 through 15. The address set on the TC/R88A-MCW151-E must
match the slot number of the selected PROFIBUS I/O-module. Free Commu-
nication Blocks carry their own address as part of the message itself.
Pin No.
Signal
Description
1
Shield
Shield/protective ground
2
--
3
B-line
Receive/Transmit data - plus (B wire)
4
RTS
Control signal for repeaters (direction control) (TTL)
5
DGND
Data ground (reference potential for VP)
6
VP
Supply voltage of the terminator resistance (5 Vdc)
7
--
8
A-line
Receive/Transmit data - minus (A wire)
9
-
-
5
9
1
6
Pin No.
Description
R-
RS485: A line / RS422: RD-
R+
RS485: B line / RS422: RD+
FG
Frame Ground
S-
RS422: SD-
S+
RS422: SD+
S+
S-
FG
R+
R-