Siemens SIMATIC ET 200X Manual page 55

Table 2-2 Restrictions imposed on the maximum configuration by the power input, continued
Configuration
options
Supply voltage fed Power input of one ET 200X:
S
to each ET 200X
from the power
S
system and
The length of the bus cable is dependent on the
PROFIBUS–DP
transmission rate of the PROFIBUS-DP
looped through via
network (see the manual for the DP master)
a separate cable

Load voltage Power input from the load of one ET 200X:
S
connected and
looped through to
S
the basic module
Power input from the load of the whole
(see Figure 2-7)
configuration if the load voltage is looped
through:
S
S
Caution
!
If you ignore the restrictions on the maximum system configuration specified in
Table 2-2, the cable insulation and the contacts may be overheated and the device
damaged as a result.
Currents of motor starters
You will find the power input and aggregate current of motor starters in the manual
EM 300 motor starters.
Currents of frequency converters
You will find the power input and aggregate current of frequency converters in the
manual EM 148-FC frequency converters.
ET 200X Distributed I/O Device
EWA 4NEB 780601602-06
Restrictions
Up to 40 _C v 1 A
Up to 55 _C v 0.8 A
Up to 40 _C v 10 A
Up to 55 _C v 8 A
Up to 40 _C v 16 A
Up to 55 _C v 12 A
Configuration Options
Calculation/overcoming the
restrictions
1. Calculate the power input of each
module (see the technical
specifications as of Section 7.1).
2. Add up the power input of the
modules of each ET 200X.
3. If the power input > 1 A (0.8 A),
reduce the number of expansion
modules per ET 200X.
1. Calculate the power input from the
load of each module (see the
technical specifications as of
Section 7.1).
2. Add up the power inputs of all the
modules of an ET 200X or of the
whole configuration.
3. If the power input from the load of
an ET 200X > 10 A (8 A), you have
two options:
– Reduce the number of
expansion module(s) with DOs
and/or motor starters/frequency
converters on the ET 200X
– Feed in the load voltage using a
power module (see Figure 2-10)
If the power input from the load of
the whole configuration > 16 A (12
A), feed the load voltage to a few
ET 200Xs from the power system
again.
2-15