Powercom 485
10
Description and operating instuctions
9
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09.
2014
1.1.9
Connecting the electric Profibus line
•
Use only shielded twisted two-wire lines complying with the Profibus specifi-
cation as Profibus line
•
Electrical isolation exists between the Profibus lines RxD/TxD-N and RxD/
TxD-P, the supply voltage and the casing (ground potential).
Therefore observe the following safety instructions:
•
Do not connect the VAHLE POWERCOM
®
485 devices via PROFIBUS lines
to plant components which are connected to a different ground potential. The
voltage differences arising could lead to destruction of the devices!
•
Do not connect any PROFIBUS lines which are installed partly or completely
out of doors, otherwise lightning strikes in the environment could lead to des-
truction of the modules.
•
Make bus connections which come out of buildings with optical waveguide
cables!
The PROFIBUS connection is designed as 9-pole subminiature D plug connec-
tor.
The pin assignment corresponds to the PROFIBUS standard configuration. A
short circuit proof 5 Volt output is available at pin 5 and 6 for connecting external
pull-up/pull-down resistors. This supply is not able to feed active units.
–
Use a plugging line fitted with 9-pole subminiature D connectors (male) on
both ends for connecting a terminal device.
–
Connect a bus connecting plug (loop-through of the Profibus line) for connec-
ting a RS 485 bus segment.
–
If the module is at the beginning or end of a bus segment, connect an external
terminating resistor combination (use a bus connecting plug with integrated
connectable terminating resistor combination).
1.1.10
LED indicators
LED
Farbe
Funktion
POWER
Green
Supply voltage ok.
POWER
not lit
Supply voltage missing or internal voltage
supply defective
RX-Signal
Red
Data received by the VAHLE POWERCOM
interface.
RX-Signal
not lit
No data being received.
TX-Signal
Red
Data transmitted by the VAHLE POWER-
COM interface.
TX-Signal
not lit
No data being sended.
