Following advices will reduce time to build application (off line, on line or both).

On Project settings.
- General->Management of Build messages: Turn off any warnings you don’t need (Off line + On line)
- General-> Project autosaving on download (On line)

• Uncheck: "save STU" (On line)
• Uncheck: "save STA" (On line) if you need to be completly secure keep this option.
• Uncheck: "save XVM" if not needed

- General-> PLC embedded data

• Check "Optimize data online" change (On line)
• Uncheck "Upload information" if you need to be secure completly keep this option.
• Select: Auto upload - on user request (On line) (1) (if Upload information have been check, if not this option is not applicable)
• Data dictionary-> uncheck if not needed (On line) will reduce the amount of MB being sent by reducing the information on variables. Only use this if you need it for your SCADA system or Vijeo Designer HMI. If needed : Use the HMI Variable only, to reduce the number of variables.

- General-> PLC diagnostics: turn off application diagnostics, if possible (Off line+On line)


On Application (Off line+On line)

• use small sections wherever possible in order to facilitate program maintenance and optimize performance when performing online modifications (as all the section content is downloaded during On line Change).To give you an indication, the size of a section should be limited by the application structure to around 300 instructions
• On LL984 language, reduce the number of networks per segment, recommended: 40 to 100 networks maximum by segment.
• Use if possible periodic Task, with enough extra time (20% of the current scan time) to treat on line modification.

General advises

• Use Build change instead of Rebuild All (Off line)
• Incremental build online: Not too big number of changes at a time: when a modification is done on a section, this complete section is rebuilt. So little modification on several sections could cause long time to build . (Off line+ On line)
• Use Ethernet Communication instead of USB.
• When Ethernet Communication. is used in the CPU configuration ‘CPU maximum Unity data exchange by PLC scan’: If you change it to 12x1024, build time will speed up but scan will be negatively affected . This may be a good setting to try during the commissioning process, then to be switched back once running in the field . (On line) (2)
  

(1) This option must be active for a running application in a plant . However, it may be not selected for bench tests.
(2) Data Dictionary requires x times 1024 to work. We need this option for SCADA application via NOE.

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