What is the maximum size of a data structure in an M580 Unity application
Issue
What is the maximum size of a data structure in an M580 Unity application ?
Product Line
EcoStruxure Control Expert (former Unity Pro), Modicon M580
Environment
Unity Pro v12.0, BMEP581020 v2.50
Resolution
The maximum size of a data structure in all Unity applications, hence in all PLCs under Unity is 64K bytes. However keep in mind that due to addressing
requirements a 64K datastructure in a Quantum PLC may not be the same as in an M580 PLC. In an M580 any data greater in size than one word must have
an odd address boundary. There is no such restriction in Quantum. Therefore when converting from Quantum to M580 the data may be moved and in the
process words will be wasted and the data structure will take up more memory.
What is the maximum size of a data structure in an M580 Unity application ?
Product Line
EcoStruxure Control Expert (former Unity Pro), Modicon M580
Environment
Unity Pro v12.0, BMEP581020 v2.50
Resolution
The maximum size of a data structure in all Unity applications, hence in all PLCs under Unity is 64K bytes. However keep in mind that due to addressing
requirements a 64K datastructure in a Quantum PLC may not be the same as in an M580 PLC. In an M580 any data greater in size than one word must have
an odd address boundary. There is no such restriction in Quantum. Therefore when converting from Quantum to M580 the data may be moved and in the
process words will be wasted and the data structure will take up more memory.
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