Eaton LoadStar-S JSB Mounting And Operating Instruction page 73

L1
L2
Bus connection 3-PM-IO and 3-PM-IO-INV
L3
N
PE
An RS485 bus is wired for data communication with exter-
nal bus modules.
The wires of the RS 485 bus line must be connected to the
ACU terminal strip at the terminal points RS485 A, RS485
B, +24V OUT and -24V OUT.
NOTE!
A parallel connection of data lines is not permitted and
3-PM-IO
does not extend the permissible line length.
Wires within a shield can be connected in parallel to supply
voltage to the modules.
The two lower DIL switches on the ACU module for the RS
485 bus must be set to „ON" at the beginning of the bus
line to activate the 120 Ohm termination resistor.
ACU
ATTENTION!
Bus topology: linear, double terminated (no stub lines per-
mitted). Cable type (minimum requirement): IY(ST)Y 4 x 2
x 0.8 mm (twisted pair, shielded) - the cable shield must be
connected to the SE terminals of each module and must
only be earthed in the LoadStar-S control cabinet. The cable
cross-section required for the 24 V bus voltage depends on
the cable length and the number of bus modules (Umin =
19 V DC). Only one pair of wires may be used as data cable
within the shield - it is not permitted to bundle several data
cables within one shielded cable! The 120 Ohm terminating
resistor is integrated in the modules and can be activated
by a bridge at terminals B1/B2.
Mounting- and Operating Instruction Eaton LoadStar-S JSB 40071860396 March 2021 www.ceag.de
© 2017 Eaton. All Rights
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34 3-PM-IO-INV Module
73