Mitsubishi Electric MELSEC iQ-F Series, User Manual

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4 SYSTEM CONFIGURATION
4.3 Limitation on the Number of Input/Output Points
Calculation of number of input/output points
The number of input/output points is the total of the number of input/output points of the CPU module and I/O module, and the
number of occupied input/output points of intelligent function modules.
Input/output points
The total number of input/output points must not exceed 256 points.
Total number of input/output points of the CPU module and I/O modules
Count the total number of input/output points of the CPU module and I/O modules.
To obtain the total number of input/output points, count the input points (X0 and more) and output points (Y0 and more) of the
CPU module and I/O modules.
For details on the number of input/output points by model, refer to the following.

Page 40 CPU Module

Page 41 I/O module
Number of occupied input/output points of intelligent function modules
Count the number of occupied input/output points of intelligent function modules.
The number of occupied input/output points per module is 8.
For details on the number of occupied input/output points by model, refer to
 Page 44 Intelligent function module.
Maximum number of
input/output points
256 points
Number of input/output points on
CPU module and I/O module
(A) + (B)
Number of input/output
occupied points
≥ + =
Number of
input/output points
(1)
Total number of input/output points of CPU
module and I/O modules.
(A): Number of input/output points of CPU module
(B): Number of input/output points of I/O modules
(C): Number of Intelligent function modules
Intelligent function module
occupies 8 input/output points.
(C) modules ×8 points