ABB TruONE ATS Installation And Operating Instruction page 87

3 4 O X _ 3 0 - 1 6 0 0 r e v. B / 1 S C C 3 0 3 0 1 1 M 0 2 0 1
5.6.2.2 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.
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.
ON IA
1 2 3 4
Rterm Rpol
220Ω
on
off
—
Fig. 5.16 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
on
off
87