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2.
SYSTEM CONFIGURATION
- - - - - - - - - - - - - - - - - - - - MELSEC-A
(7)
If two or more I/O modules are connected to one power supply, choose
cables and wiring route considering voltage drop caused by cables.
The figure below explains the voltage drop caused by cables.
V2
I
I
/
\
I
,
0---)
Stabilized
/
power supply
11
+
12
12
\
1/
1/
-,
I
Rl
R2
I
I
I,
12
I
I/O module 1
I/O module 2
V1
Voltage drop between stabilized power supply and I/O module
1
V2
VoRage drop between I/O module 1 and I/O module
2
R1
Resistance between stabilized power supply and 110 module 1
R2
Resistance between I/O module 1 and I/O module 2
h
Current consumption of I/O module 1
12
Current consumption of I/O module 2
!Voltage drop calculation
I
VI = Rl x (11
+
12)
V2
=
R2X 12
I
Receiving port voltage of I/O module
I
(Receiving port voltage of I/O module 1)
=
(Voltage of stabilized power supply) - VI
(Receiving port voltage of I/O module 2)
=
(Voltage of stabilized power supply) - VI - V2
An I/O module can be connected if the receiving port voltage of I/O module
is higher than the rated voltage of the I/O module to be used.
2-7

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