Mitsubishi Electric MELSEC iQ-F FX5 User Manual page 22

■Function blocks
FB definitions from GX Works3 are represented in the FX5-OPC address space as ObjectType nodes containing variables
such as inputs, outputs, internal variables and external variables.
FB instances are represented as Object nodes.
For details, refer to the following:
Page 37 User nodes
■Considerations
The number of labels that can be exposed in the FX5-OPC address space depends on the usage of the following resources:
(1) ROM space reserved for storing the address space parameters
(2) RAM space reserved for caching variable values read from a CPU module
(3) RAM space reserved for storing node information in the address space
(4) Size of TypeDictionary describing user-defined data types
The following operations may optimize each space/size of (1) to (4).
No. Optimizing operation
(1) • Shorten names of files, program blocks, function blocks, structures, and labels.
• Disable the setting of "Expose structure members as components."
(2) • Avoid using strings and arrays with a large number of elements.
(3) • Avoid using structures and FB instances with a large number of members.
• Disable the setting of "Expose structure members as components."
(4) • Shorten names of structure members.
2 SPECIFICATIONS
20
2.3 Performance Specifications