Omron CX-PROGRAMMER V8.1 Operation Manual page 59

Function Block Specifications
Note
34
1.0
P_On FB
EN ENO
D0 D100
PV CV
The value of the output variable (CV) is passed to the parameter
specified as the output destination, which is D100 in this case.
Example
10.0
0.0
ADD_INT_DINT
EN ENO
D100
D1000
IN16 OUT32
D200 IN32
OUT32 is a DINT variable, so
the variable's value is passed
to D1000 and D1001.
Like internal variables, the values of output variables are retained until the
next time the instance is executed (i.e., when EN turns OFF, the value of the
output variable is retained).
Example:
In the following example, the value of output variable CV will be retained until
the next time the instance is executed.
Product A counter
CTD
CD Q
LD
D150
PV CV
1. The same name cannot be assigned to an input variable and output vari-
able. If it is necessary to receive a value from an external variable, change
the variable inside the function block, and then return the result to the ex-
ternal variable, use an input-output variable.
2. When the instance is executed, output variables are passed to the corre-
sponding parameters after the algorithm is processed. Consequently, val-
ues cannot be written from output variables to parameters within the
algorithm. If it is necessary to write a value within the execution cycle of the
algorithm, do not write the value to a parameter. Assign the value to an in-
ternal variable and use an AT setting (specified addresses).
Initial Value
An initial value can be set for an output variable that is not being retained, i.e.,
when the Retain Option is not selected. An initial value cannot be set for an
output variable if the Retain Option is selected.
The initial value will not be written to the output variable if the IOM Hold Bit
(A50012) is ON.
Auxiliary Area control bit
IOM Hold Bit (A50012)
Algorithm (Body)
EN
SIGN IN16 tmp
+L IN32 tmp OUT32
Variable table
Usage Name Data type
Internal
tmp DINT
Input
EN BOOL
Input
IN16 INT
Input
IN32 DINT
Output
ENO BOOL
Output
OUT32 DINT
ON The initial value will not be set.
Section 2-1
Initial value