2. Installation
It is recommended that a 9-pin D-Sub connector be used for protecting rating IP 20. For IP
65/67, M12 connector in accordance with IEC 947-5-2, Han-Bird connector in accordance
with DESINA, and Siemens hybrid connector are available.
Pin assignment (9-pin D-Sub)
Pin No. Signal Assignment
1 Shield Shield / Protective ground
2 M24 Ground of output voltage (24 V)
3 RxD/TxD-P Data line B
4 CNTR-P Repeater control signal (directional control)
5 DGND Communications power supply (5 V)
6 VP Supply voltage to terminating resistor (P5V)
7 P24 Output voltage (24 V)
8 RxD/TxD-N Data line A
9 CNTR-N Repeater control signal (directional control)
Use pins 2 and 7 for connecting a maintenance device without any power supply.
The following figure illustrates wiring.
Station 1 Station 2
RxD/TxD-P (3)
DGND (5)
VP (6)
RxD/TxD-N (8)
(3) RxD/TxD-P
(5) DGND
(6) VP
(8) RxD/TxD-N
Shield
Protective Ground Protective Ground
Different manufacturers produce a wide range of PROFIBUS cables. For details of the
PROFIBUS cables, see PROFIBUS International’s website (http://www.profibus.com/).
Terminating Resistor
To reduce reflections of communication signal, terminating resistors should be attached on
both ends of each segment. Attach the terminating resistor as shown below.
VP (6)
390
Ω
RxD/TxD-P (3)
220
Ω
RxD/TxD-N (8)
390
Ω
DGND (5)
Data Line B
Data Line A
Some PROFIBUS 9-pin D-Sub connectors on the market have functions of terminating
resistor and they can enable / disable the terminating resistor. (Example: Woodhead
MA9D00-32)
Molded terminating resistors with connector are also available to attach them to environment-
resistant M12 connector.
Baud Rate and Maximum Cable Length
Available baud rates are 9.6 kbps, 19.2 kbps, 93.75 kbps, 187.5 kbps, 500 kbps, 1500 kbps, 3
Mbps, 6 Mbps, and 12 Mbps.
Fieldbus I/O Rev.6 21