
6
Electrical installation
Terminal assignment and DIP switches
Manual – DHE/DHF/DHR21B (standard) and DHE/DHF/DHR41B (advanced)
30
Assignment
No.
Name
Function
X30P
1
N.C.
Not connected
2
N.C.
Not connected
3
RxD/TxD-P
Receive/send signal positive
4
CNTR-P
PROFIBUS repeater control signal
5
DGND (M5V)
Reference potential for PROFIBUS
6
VP (P5V/100 mA)
DC +5 V potential for bus terminator
7
N.C.
Not connected
8
RxD/TxD-N
Receive/send signal negative
9
DGND (M5V)
Reference potential for PROFIBUS
Connecting PROFIBUS to DHF21B/41B controller
The DHF21B/41B controller is connected to the PROFIBUS system using a shielded
twisted-pair cable. Observe the maximum supported transmission rate when selecting
the bus connector.
The twisted-pair cable is connected to the PROFIBUS connector at pins 3 (RxD/TxD-
P) and 8 (RxD/TxD-N). Communication takes place using these two pins. The RS485
signals RxD/TxD-P and RxD/TxD-N must all be connected to the same contacts in all
PROFIBUS stations. Else, the bus components cannot communicate via the bus me-
dium.
The PROFIBUS interface sends a TTL control signal for a repeater or fiber optic ad-
apter (reference = pin 9) via pin 4 (CNTR-P).
Baud rates greater than 1.5 MBaud
Operating the DHF21B/41B option card with baud rates > 1.5 MBaud is only possible
with special 12 MBaud PROFIBUS connectors.
Bus termination
You need not equip the DHF21B/41B option card with bus terminating resistors. This
means the PROFIBUS system can be put into operation more easily and the number
of error sources during installation is reduced.
When the DHF21B/41B option card is located at the start or end of a PROFIBUS seg-
ment and when there is only one PROFIBUS cable connected to the DHF21B/41B op-
tion card, you must use a plug with an integrated bus terminating resistor.
Switch on the bus terminating resistors for this PROFIBUS connector.
22900055/EN – 08/2016
Содержание DH 21B Series
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