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Configuration Options
Table 2-2
Restrictions imposed on the maximum configuration by the power input
Configuration
options
Supply voltage and
Power input of the whole configuration:
S
PROFIBUS-DP fed
and looped
S
through via a
common cable
Maximum cable length:
S
Supply voltage and
PROFIBUS-DP fed
via separate
cables and looped
through via a
S
common cable
Supply voltage and
Power input of one ET 200X:
S
PROFIBUS-DP fed
and looped
S
through via
separate cables
The maximum cable length for the supply
voltage is dependent on the cable core
cross-section and on the power input of the
whole configuration:
S
S
S
S
The length of the bus cable is dependent on the
transmission rate of the PROFIBUS-DP
network (see the manual for the DP master)
2-14
Restrictions
Up to 40 _C v 6 A
Up to 55 _C v 4 A
25 m if the power input of the whole
configuration is as follows:
Up to 40 _C v 6 A
Up to 55 _C v 4 A
120 m if the power input of the whole
configuration is as follows:
Up to 40 _C v 1 A
Up to 55 _C v 0.8 A
Up to 40 _C v 1 A
Up to 55 _C v 0.8 A
Cable core cross-section 0.75 mm
power input 1 A (0.8 A): cable length 120 m
Cable core cross-section 0.75 mm
power input 6 A (4 A): cable length 12 m
Cable core cross-section 1.5 mm
power input 1 A (0.8 A): cable length 240 m
Cable core cross-section 1.5 mm
power input 6 A (4 A): cable length 24 m
Calculation/overcoming the
1. Calculate the power input of each
module (see the technical
specifications as of Section 7.1).
2. Add up the power input of all the
modules in the whole configuration.
3. If the current input > 6 A (4 A), then
feed the supply voltage to a few
ET 200Xs from the power system
again (permissible power input
per ET 200X v 1 A or v 0.8 A as a
function of temperature).
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.
To calculate the cable length:
1. Add up the power input of all the
modules in the whole configuration.
2. Increase the cable length, if
2
and
necessary, by feeding the supply
voltage for a few ET 200Xs from
2
and
the power system again.
2
and
2
and
ET 200X Distributed I/O Device
EWA 4NEB 780601602-06
restrictions
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