Refresh Setting - Mitsubishi Electric MELSEC iQ-R Series User Manual

2.4

Refresh Setting

Set the timing with which to refresh the specified target.
Refresh Timing
Set the refresh timing in the module parameter.
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Item
Refresh Timing
Refresh Group[n](n: 1-64)
When the refresh is enabled, the refresh target values will be valid at the timing set in the engineering tool. At
that time, buffer memory areas are overwritten with the refresh target values.
To change the refresh target values in the buffer memory areas, create a program that changes the values in
the refresh target module labels and devices.
Refresh processing time
The refresh processing time [μs] is an element that configures the scan time of the CPU module. For the scan time, refer to
the following.
 MELSEC iQ-R CPU Module User's Manual (Application)
The following shows the formula to calculate the refresh processing time [μs] with the refresh settings enabled.
• Refresh processing time [μs] = Refresh read (refresh transferred to the CPU module) time + Refresh write (refresh
transferred to an intelligent function module) time
Calculate the refresh read time and refresh write time from the number of items where the refresh settings have been set and
the number of transfers (words). For the calculation method, refer to the following.
 MELSEC iQ-R CPU Module User's Manual (Application)
2 PARAMETER SETTINGS
46
2.4 Refresh Setting
[Parameter] [Module Information]
Description
Sets the refresh timing.
When "Refresh Timing" is set to "At the Execution Time of Specified Program",
specifies the refresh group of programs.
[RJ71EIP91] [Refresh Settings]
Setting range
• At the Execution Time of END
Instruction
• At the Execution Time of
Specified Program
(Default: At the Execution Time of
END Instruction)
1 to 64
(Default: 1)