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8 MODULE FB
Module FB can be classified into following types according to module buffer memory
area reading/writing instructions.

Classification name Contents Reference
Analog module FB
Reads A/D conversion values from A/D converter modules (4 channels,
8 channels), channel-isolated A/D converter modules (4 channels, 8
channels), channel-isolated high resolution A/D converter module with
signal conditioning function (2 channels), and channel-isolated A/D
converter module with signal conditioning function (6 channels).
Writes digital values to 2 channels, 4 channels, 8 channels, 2 channel-isolated, and 6 channel-isolated D/A converter modules.
Section 8.1
Temperature input
module FB
Read temperature conversion value from 4/8 channels temperature input
module.
Section 8.2
Counter module FB
Read pulse count value from high-speed counter module and isolation type
pulse input module
Section 8.3
Digital input/output
module FB
Read ON/OFF input value from 8/16/32/64 points input module.
Write ON/OFF output value to 8/16/32/64 points output module.
Read/write ON/OFF input/output value from/to 15/64 points input/output
mixed module.
Section 8.4
CC-Link module FB Read/write information of CC-Link slave stations occupying 1/2/3/4 stations. Section 8.5

(1) Read/write of I/O signals and buffer memory data that do not exist in public
variables
Some of the I/O signals and buffer memory data of the module can be read/written
with the public variables of the module FB.
On the other hand, read/write the I/O signals and buffer memory data, which do
not exist in the public variables of the module FB, using either of the following
methods.
(a) Read/write using global variable
When declaring a global variable in the global variable declaration window of
the programming tool, set the I/O signal or buffer memory address to Assigned
device.

The declared global variable is placed in the FBD program and used for
read/write.
(b) Read/write using GX Developer
Perform read/write using Device batch or Buffer memory batch of GX
Developer.
For details of GX Developer, refer to the GX Developer Operating Manual.

POINT
The usable I/O signals and buffer memory addresses change depending on the
module.
For details, refer to the manual of the used module.











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