Functions And Function Blocks - Mitsubishi MELSEC-Q Series Programming Manual

4.2.7

Functions and function blocks

The following table shows differences between functions and function blocks.
Output variable assignment
(1) Output variable assignment
A function always outputs a single operation result. A function that does not output any
operation result or outputs multiple operation results cannot be created.
A function block can output multiple operation results. It also can be created without any
output.
4.2 POUs
4-10
4.2.7 Functions and function blocks
Table 4.2.7-1 Differences between functions and function blocks
Item
Internal variable
Creating instances
Function
Outputs one
operation result
Function
Can not be assigned
Not used
Not necessary
Function block
Can be assigned
Used
Necessary
Function block
Outputs multiple
operation results
Without any
output