
Page 55
120 Ohm
1/4W
390 Ohm
1/4W
390 Ohm
1/4W
+5V
GND
A (green)
B (red)
Terminating resistances
Each bus segment must be terminated at the
end with terminating resistances. The terminat-
ing resistances are already contained in the
connectors of some manufacturers and can be
optionally cut in.
Cable length
The maximum permissible cable length depends on the type of cable and the transmission rate
level. The length of the cable is measured between the bus driver of the first device and the bus
driver of the last device.
We recommend you only use shielded cables which conform to the standard EN50170-2 cable
type A. This type of cable is offered by all leading cable manufacturers.
m
Important!
If the supplying voltage for the terminat-
ing resistances is taken from the
UMG96S, the profibus is short-circuited,
if the UMG96S no longer receives an ad-
equate voltage supply.
Communication on the profibus col-
lapses.
To
prevent
this,
the
terminating
resistances must be added to the +5V
and GND independently of the device.
Fig. Bus connection for Profibus DP
Pin 1
Pin 2
Pin 3
Pin 4
Pin 5
Pin 6
Pin 7
Pin 8
Pin 9
DSUB-9 connector
A
B
DGND
Shielding is not
connected in the UMG96S
VP
UMG96S
Profibus option
Transmission rate [kBit/s]
9.6
19.2
45.45
93.75
187.5
500
1500
Cable length [m]
1200
1200
1200
1200
1000
400
200
Permissible cable lengths if using cable type A.
Содержание UMG 96S 24V
Страница 9: ...Page 9 ...
Страница 17: ...Page 17 ...