Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 79

■ Input/output points of a function
• Connect all input points of a function with another FBD element.
• The data type is assigned to each input variable and output variable of a function. Match the data type of an element
connected to the input point or output point with that of the input variable or output variable.
• Connect the output variable (except ENO) of an CPU module instruction or module dedicated instruction to the input
variable of a function (or function block) via a variable element.
• When connecting two functions, always connect a function with EN to a function with EN so that the the functions do not
use an undefined value. (Do not connect a function with EN to a function without EN.) In this case, connect ENO of the first
function to EN of the second function.
■ When the step relay (S) or SFC block device (BL) is used
If the step relay (S) or SFC block device (BL) is used as a variable element, a conversion error may occur. If an error occurs,
change the variable element to a contact element.
Ex.
The following is the example of rewriting.
Before change
In addition, to use the digit-specified step relay (S) or the step relay with block specification (BL\S), the data size must be
specified correctly. Since the step relay (S) and the step relay with block specification (BL\S) are not targeted for auto data
type conversion, a conversion error may occur if the data size are not the same.
Ex.
The following is the example of rewriting.
Before change
(1)
After change
After change
(1) Connect ENO to EN.
7 FBD/LD
7.1 Configuration
7
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