Mitsubishi 13J851, User Manual

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(2) CPU module, memory cassette, base unit
Conventional models can be used for these modules, because they only
have a 5 V DC circuit inside.
(3) Special function module
Conventional models can be used for the special function modules
including analog module, network module, and positioning module,
because the rated voltage is 24VDC or smaller.
(4) Display device
Use a CE marked display.
3.2.3 Power supply
The insulation specification of the power supply 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.