Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 26

Setting initial values
■ Initial values of local label
For the local label of a function block, an initial value can be set for each function block definition or instance.
Local labels whose initial value can be set differ depending on the type and attribute.
Page 42 Definable data types and initial values
■ Initial values of instance
The following table summarizes the types of the initial values of instances.
Type
Default initial value
FB definition initial value
Instance initial value
3 PROGRAM ORGANIZATION UNITS
24
3.3 Function Blocks (FB)
Description
An initial value predefined for each data type. If an initial value is not set for the local label of a function block, the default
initial value will be used.
FB1 definition
FB1
Local label definition (FB1)
Label name Initial value
AAA
BBB
CCC
(1)
(1) The initial values have not been set for the local labels in the FB1 definition.
(2) The default initial values are used.
An initial value that is set when the local label of a function block is defined. If this initial value has been set, the same
definition initial value will be used for all the instances.
FB1 definition
FB1
Local label definition (FB1)
Label name Initial value
AAA 1111
BBB 2222
CCC 3333
(1)
(1) The initial values have been set for the local labels in the FB1 definition.
(2) All the instances of FB1 will be initialized by the same definition initial value.
An initial value that is set for an instance included in the global label and program block local label definition.
FB1 definition
FB1
Local label definition (FB1)
Label name Initial value
AAA 1111
BBB 2222
CCC
3333
(1) The initial value can be set for each instance in the FB1 definition.
Global label definition
Label name Initial value
-
FB1_a -
AAA 0
BBB 0
CCC 0
Local label definition
(program block 1)
Label name Initial value
-
FB1_b -
AAA 0
BBB 0
CCC 0
Global label definition
Label name Initial value
-
FB1_a -
AAA 1111
BBB 2222
CCC 3333
Local label definition
(program block 1)
Label name Initial value
-
FB1_b -
AAA 1111
BBB 2222
CCC 3333
Global label definition
Label name Initial value
-
FB1_a
-
AAA
3333
BBB
4444
CCC
5555
Local label definition
(program block 1)
Label name Initial value
-
FB1_b -
AAA 7777
BBB 8888
CCC 9999
(2)
(2)
(1)