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Analog Modules
7.1.2
Adapter boards, special adapters and special function modules
A number of different types of analog modules are available for the MELSEC FX family.
Adapter Boards
Adapter boards are small circuit boards that are installed directly in the FX
FX
3GE
switchgear cabinet.
Special Adapter
Adapter modules can be connected only to the left side of a basic unit of the MELSEC FX
FX
, FX3
3GC
Special function modules
With the exception of the FX
nected on the right side of a single base unit of the MELSEC FX family.
7 – 4
or FX
controllers, which means that they don't take up any extra space in the
3S
FX1 N-2A D
, FX
FX
or FX
GE
3S,
3U
and the FX
1S
FX -4 AD -T C
2N
A / D
The analog input adapter enters the digital values of both
input channels directly into the special register. This
makes the further processing of the measured values
especially simple.
The output value for the analog output adapter is likewise
written into a special register by the program and then
converted by the adapter and outputted.
series.
3UC
The installation of one analog adapter module is possible
in FX
basic units with 14 or 24 inputs and outputs and
3G
also to FX
or FX
3GE
3S
Up to two analog adapter modules can be connected to
FX
basic units with 40 or 60 I/Os and FX
3G
and up to four to a FX
Special adapters do not use any input or output points in
the base unit. They communicate directly with the base
unit via special relays and registers. Because of this, no
instructions for communication with special function
modules are needed in the program (see below).
, up to eight special function modules can be con-
3S
In addition to analog modules the available special
function modules include communication modules, posi-
tioning modules and other types. Each special function
module occupies eight input points and eight output
points in the base unit. Communication between the spe-
cial function module and the PLC base unit is carried out
via the memory buffer of the special function module with
the help of FROM and TO instructions (see section 5.2.5).
Processing Analog Values
FX
1S,
base units.
3GC
or FX
.
3U
3UC
MITSUBISHI ELECTRIC
, FX
,
1N
3G
,
3G
base units
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