GFK-1911B
Chapter 5 Power for the Station
5-13
5
The current requirements for U
L
and U
ANA
are within the supply capability of the
Profibus NIU. The current requirement of U
S
exceeds the supply capability of the
NIU, so additional power terminals must be used. The number of additional power
terminals to be used depends on the arrangement of the modules.
As discussed in chapter 4, the recommended sequence of the modules in this
example is:
IC
220PBI
002
IC
220MDL721
IC
220MDL721
IC
220MDL721
IC
220MDL752
IC
220MDL751
IC
220PWR014
IC
220MDL643
IC
220MDL641
IC
220MDL641
IC
220ALG620
4A 1.2A 4A 2A 1A 2A 0.5A 0.5A
U
S
/U
M
:
5.2A
4A 2A 1A
3A
If this arrangement must be maintained, two additional power terminals are
needed:
IC
220PBI
002
IC
220MDL721
IC
220MDL721
IC
220PWR001
IC
220MDL721
IC
220MDL752
IC
220MDL751
IC
220PWR001
IC
220PWR014
IC
220MDL643
IC
220MDL641
IC
220MDL641
IC
220ALG620
4A 1.2A 4A 2A 1A
2A 0.5A
0.5A
U
S
/U
M
:
5.2A
7A
3A
If a system design goal is to use as few terminals as possible, the module
sequence must be changed. In this case, only one additional power terminal would
be needed:
IC
220PBI
002
IC
220MDL721
IC
220MDL721
IC
220MDL752
IC
220PWR001
IC
220MDL721
IC
220MDL751
IC
220PWR014
IC
220MDL643
IC
220MDL641
IC
220MDL641
IC
220ALG620
4A 1.2A 2A 4A 1A 2A 0.5A 0.5A
U
S
/U
M
:
7.2A
8A
Please note that while the I/O modules must be rearranged in order to minimize
the number of power terminals required, the recommended module sequence is
preserved downstream of each power terminal.
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