
5. POWER SUPPLY MODULE
5 - 3
MELSEC-A
5.1.1
Selection of the power supply module
Select the power supply module according to the total current consumption of I/O
modules, special function modules and peripheral devices supplied by the power
supply module. When an A1S52B(S1), A1S55B(S1), A1S58B(S1), A52B, A55B or
A58B is used, the power is supplied from the power supply module of the main
base unit. This point should also be taken into consideration.
See Section 2.3 for details of the 5 V DC current consumptions of I/O modules,
special function modules, and peripheral devices.
Power supply module
CPU module
I/O modules
A1SX10, A1SY10, etc.
Special funcntion modules
A1SD61, A1SD71-S2, etc.
Peripheral devices
A8PUE, A6WU, etc.
Peripheral device
AD71TU
*
* Take the current consumption of
the peripheral device to be con-
nected to the special function
module into consideration.
When an AD71TU is connected
to an A1SD71-S2, the current
consumption of the AD71TU
must be counted in.
(1)
Power supply module when an extension base A1S52B(S1), A1S55B(S1),
A1S58B(S1), A52B, A55B or A58B is used.
When an extension base A1S52B(S1), A1S55B(S1), A1S58B(S1), A52B,
A55B or A58B is used, the 5 V DC is supplied from the power supply module
of the main base unit through the extension cable. Note the following points
regarding the use of an extension base from among A1S52B(S1),
A1S55B(S1), A1S58B(S1), A52B, A55B and A58B :
(a)
Select a power supply module for the main base unit whose 5 V DC
capacity can cover the 5 V DC current consumption of the A1S52B(S1),
A1S55B(S1), A1S58B(S1), A52B, A55B or A58B.
[Example]
When the 5 V DC current consumption by the main base unit is 3 A
and that by the A1S55B(S1) is 1 A, the power supply module
installed at the main base unit must be A61P (5 V DC, 5 A).
(b)
Since the power is supplied to the A1S52B(S1), A1S55B(S1),
A1S58B(S1), A52B, A55B or A58B through the extension cable, some
voltage drop occurs in the cable. It is necessary to select a power supply
module and length of cable which can provide 4.75 V DC or more at the
receiving end.
For details of voltage drop and other information, see Section 6.1.3
"Application standards for extension base units".
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