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If one assumes that all outputs are switched on and are operated with their maximum permitted load
currents (under compliance with the maximum permitted currents at the supply terminals), then the
following values are the result for the example shown above:
PM581-ETH
CM572-DP
CM575-DN
CM577-ETH
CM578-CN
AI523
AO523
AX521
AX522
DC522
DC523
DC532
Sums
\
*) The maximum permitted total current over the supply terminals of the I/O Terminal Units is 8 A.
Dimensioning of the fuses
To be able to select the fuses for the station correctly, both the current consumption and the inrush
currents (melting integral for the series-connected fuse) must be taken into consideration.
Fuse
F1
CPU cluster
F2
Module DC522
F3
Module DC523
F4
Module DC532
F5
Modules AX521
+ AX522 +
AI523 + AO523
____________________________________________________________________________________________________________
V2
AC500 Hardware
I
I
CPU
Cx
0.110 A
-
-
0.050 A
-
0.050 A
-
0.085 A
-
0.050 A
-
-
-
-
-
-
-
-
-
-
-
-
-
-
0.110 A
0.235 A
-----------------------------
------------------------------
V
I
= 0.359 A
CLUSTER
----------------------------------------
\
for
Sum of the
melting integrals
in A²s
1.000
0.005
0.008
0.007
0.130
I
I/O-Bus
CPU part
-
-
-
-
-
I/O part
0.002 A
0.002 A
0.002 A
0.002 A
0.002 A
0.002 A
0.002 A
0.014 A
/
---------------------------------------
V
I
= 25.329 A
Total
I
Cluster
A
0.359
1-59
System data
I
UPx
-
-
-
-
-
0.150 A
0.150 A
0.160 A
0.100 A
0.080 A
0.100 A
0.080 A
0.050 A
8.000 A *)
0.050 A
8.000 A *)
0.050 A
8.000 A *)
0.650 A
24.320 A
---------------
----------------
\
V
I
= 24.970 A
UP
/
I
Recommended fuse
UPx
Type
A
quick
8.050
quick
8.050
quick
8.050
quick
0.820
quick
AC500 / Issued: 05.2007
I
LOADx
-
-
-
-
-
-
/
Value
10 A
10 A
10 A
10 A
10 A
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