9. EMC DIRECTIVE AND LOW-VOLTAGE INSTRUCTION
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MELSEC-
9.2.2 Precautions when using the AnS series
Module selection
(1) Power module
For a power module with rated input voltage of 100/200 V AC, select a model
in which the internal part between the first order and second order is
intensively insulated, because it generates hazardous voltage (voltage of 42.4
V or more at the peak) area.
For a power module with 24 V DC rated input, a conventional model can be
used.
(2) I/O module
For I/O module with rated input voltage of 100/200 V AC, select a model in
which the internal area between the first order and second order is intensively
insulated, because it has hazardous voltage area.
For I/O module with 24 V DC rated input, a conventional model can be used.
(3) CPU module, memory cassette, base unit
Conventional models can be used for these modules, because they only have
a 5 V DC circuit inside.
(4) Special module
Conventional models can be used for the special modules including analog
module, network module, and positioning module, because the rated voltage
is 24 V DC or smaller.
(5) Display device
Use an A900 series GOT CE compatible model.
9.2.3 Power supply
The insulation specification of the power module was designed assuming
installation category II. Be sure to use the installation category II power supply to
the PLC.
The installation category indicates the durability level against surge voltage
generated by a thunderbolt. Category I has the lowest durability; category IV has
the highest durability.
Category III Category II Category I Category IV
Figure 1. : Installation Category
Category II indicates a power supply whose voltage has been reduced by two or
more levels of isolating transformers from the public power distribution.
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