Burkert Type 8644 - Manual (Page 37)

8644/phoenix - 33
S
YSTEM
D
ESCRIPTION
The Profibus bus node
Installation and electrical commissioning of the field bus node
Profibus DP
Display / LEDs
Address setting
9-pole SUB-D Profibus connector
Supply terminals
(for configuration, see
following page)
Configuration of the 9-pole SUB-D connector
As a general rule, a 9-pole SUB-D connector with pins is used in the PROFIBUS. In the profibus DP field
bus coupler, the matching part (socket) is always present. In the first and last plugs of a segment, a
closing resistor of 220 ohm and two terminating resistors of 390 ohm must be present. The A line (RxD/
TxD-P) is always earthed via one terminating resistor, the B line (RxD/TxD-P) is always connected to +5V
via the other one. These resistors must be provided in the plug (e.g. Phoenix Contact SUNCON-PLUS-
PROFIB, Art. no. 27 44 34 8).
Separate potentials
The interface supply for the Profibus has a separate potential from that of the power supplies. When using
an LWL converter, the voltage shut-off to the 5 V logic supply to the bus terminal can be cancelled via DIP
switches 9 an 10. This makes the higher current required for operating the LWL converter available at the
interface.
* Removal of potential separation
Pin No. Designation (socket in device, plug on
cable)
Meaning
1 n. c. -
2 n. c. -
3 RxD / TxD-P Receive / send data P (+) (conductor B)
4 CNTR-P Control signal for repeater (+), direction control
5 DGND* Reference potential of 5 V
6 VP* Supply voltage + 5 V for closing resistors
7 n. c. -
8 RxD/TxD-N Receive / send data N (-) (conductor A)
9 n. c. -