74
1
Z E N ITH Z TG ( D/C T ) T-S E R I E S 16 0 0 -3 0 0 0 A
5.5.2.2 Termination resistor
The Ekip Com Profibus DP modules pro-
vide the possibility to insert a 220 Ω ter
-
mination resistor on the RS-485 bus, by
setting the DIP-switches Rterm (1 and 2)
on the side of the modules, in position
ON.
Rterm Rpol
120
Ω
on
on
off
off
ON IA
1 2 3 4
—
Fig. 5.15 Termination resistor; To enable the Rterm, the
dip-switches 1 and 2 must be positioned to ON. When Rterm
is activated, the Rpol must also be activated by turning
dip-switches 3 and 4 to ON-position. These options must
be selected before the installation of the modules
5.5.2.1 LED indications
The following table illustrates the possi-
ble signals, and their meaning:
—
Fig. 5.14 Signals of Ekip Com Profibus DB -module
LED
Indication
Description
Power LED, green
Off
Power supply absent.
On fixed
Power supply and communication with the
device present.
On, with one flash per second
Power supply and communication with
device present.
On, with two quick flashes per second Power supply present, and communication
with device absent.
RX LED, green
Off
Communication not active.
On, fixed
Communication active.
TX LED, green
Off
Communication not active.
On, flashing
Communication active.
—
Table 5.9 Indication / Ekip Com Profibus DP -module
In the event of termination of the bus, a
390 Ω pull-up or pull-down resistor must
also be inserted on the lines, by setting
the DIP-switches Rpol (3 and 4), in posi-
tion ON.
These options must be selected before in-
stallation of the modules.
Содержание Zenith ZTG T Series
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