System Memory (Ram) - Mitsubishi Electric MELSEC iQ-R Series User Manual

System memory (RAM)

System memory (RAM) stores the data used for the control in an add-on library. The following shows the total size of system
memory (RAM).
Model
System memory (RAM) size
System memory (RAM) usage setting
The amount of system memory (RAM) available in each add-on library is set by
System.PrConst.Addon_AddonLibraryName.RamSizeMax. Memory usage between each function can be flexibly adjusted
according to the application with this parameter.
System memory (RAM) usage setting method
The maximum amount of system memory (RAM) used in the add-on can be set by the engineering tool.
• The maximum usage of system memory (RAM) can be set in K bytes.
• The set maximum usage is applied at system start.
The current/maximum amount of system memory (RAM) used in the add-on can be monitored by
System.Md.Addon_AddonLibraryName.RamUsage/System.Md.Addon_AddonLibraryName.RamMaxUsage respectively. The
value is stored in K bytes.
The current/maximum total amount of system memory (RAM) used in all add-ons can be monitored by
System.Md.MemoryUsage.RamUsage/System.Md.MemoryUsage.RamMaxUsage respectively. The value is stored in K
bytes.
Ex.
Examples of adjustable memory:
• Buffer size available in logging
• Cam open area size
• Axis/variable instance size (It determines the total number of available axes.)
• ST program area (It determines the maximum number of program steps.)
Label memory (RAM) usage setting
Set usable memory (RAM) in label by System.PrConst.LabelMemorySize. Current memory free size in label memory can be
checked by System.Md.LabelMemoryFreeSize.
3 BASIC FUNCTIONS
98
3.3 System Memory Settings
RD78G
96 MB
RD78GH
160 MB