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Calculation of the total current consumption
In the following example, the aC500 control system consists of
- the CPU PM581-ETH
- the 4 communication modules CM572-DP (1x), CM575-DN (1x), CM577-ETH (1x), CM578-CN (1x)
- the 7 expansion modules DC522 (1x), DC523 (1x), DC532 (1x), AX521 (1x), AX522 (1x), AI523 (1x),
AO523 (1x)
- as well as the required Terminal Bases and Terminal Units
Remark: Because of the high total current consumption of the digital I/O modules (from UP = 24 DC),
the supply is divided up into several electric circuits fused separately. The maximum permitted total
current over the supply terminals of the I/O Terminal Units is 8 A.
The total current can be calculated as follows:
I
= I
+ I
Total
CLUSTER
UP
with the following assumptions
I
= I
+ I
CLUSTER
CPU
I/O-Bus
I
= Number of expansion modules x Current consumption through the I/O-Bus per module
I/O-Bus
and
I
= I
+ I
+ I
UP
UP1
LOAD1
UP2
____________________________________________________________________________________________________________
V2
AC500 Hardware
+ I
+ I
+ I
+ I
(CPU + couplers + I/O-Bus)
C1
C2
C3
C4
+ I
+ I
+ I
LOAD2
UP3
LOAD3
+ I
+ I
+ I
+ I
UP4
LOAD4
UP5
LOAD5
1-58
System data
+ I
+ I
+ I
+ I
UP6
LOAD6
UP7
AC500 / Issued: 05.2007
LOAD7
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