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6 Examination of System Configuration
6.3 Number of Input/Output Points and Maximum Number of Input/Output Points
72
FX3G Series Programmable Controllers
User's Manual - Hardware Edition
6.3 Number of Input/Output Points and Maximum Number of Input/Output
Points
6.3.1 Calculation of number of input/output points
To obtain the total number of input/output points, count the input/output points of input/output powered
extension units/blocks and the input/output occupied points of special function blocks.
The number of remote I/O points on CC-Link network must be excluded.
1 Total the number of input/output points on the main unit and the number of
those on the input/output powered extension units/blocks.
To obtain the total number of input/output points, count the input points (X000 and more) and output
points (Y000 and more) of the main unit and input/output powered extension units/blocks.
The number of input/output points of each type of device is shown on the list below.
→ The list of numbers of input/output points is shown in Section 6.8.
2 Count the input/output points of the remote I/O stations connected on FX2N-
64CL-M network.
Add the number of remote I/O points to the number of input/output points from the main unit and
input/output powered extension units/blocks calculated in the above step.
→ For the remote I/O point calculation method, refer to the FX2N-64CL-M manual.
3 Count the number of input/output occupied points of special function blocks.
The number of occupied input/output points per unit is 8.
The number of occupied input/output points of each type of device can be obtained by the following
formula or from the list shown below.
→ For a list of occupied input/output points, refer to Section 6.8.
Observe the following instructions when using the following products.
•FX
3U-16CCL-M (CC-Link master)
Only one FX3U-16CCL-M unit can be connected to a single PLC main unit.
This master cannot be used together with FX
2N-16CCL-M.
•FX
2N-16CCL-M (CC-Link master)
When more than one master station is connected, a remote I/O station cannot be connected to the 2nd and
following master stations.
This master cannot be used together with FX
3U-16CCL-M.
•FX3U-64CCL
Only one FX3U-64CCL unit can be connected to a single PLC main unit.
=
Number of special function
blocks
Number of special function
blocks
Number of points per unit
8 points
Each special function block
used for FROM/TO instructions
occupies eight input or output
points.
units
Number of occupied
input/output points
points
Total number of
occupied input/
output points