Mitsubishi Electric RD77MS2 - Page 357

10 PARAMETER SETTING
10.2 Module Parameters
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■Refresh group
Set the refresh timing of the specified refresh destination.
Refresh processing time
A refresh processing time [s] is a constituent of the scan time of the CPU module. For details on the scan time, refer to the
following.
 MELSEC iQ-R CPU Module User's Manual (Application)
The refresh processing time [s], which is taken for refresh processing, is given by:
• Refresh processing time [s] = Refresh read time (refresh data transfer to the CPU module)
The refresh read time varies depending on the settings of "Target".
■When "Target" is a module label or a refresh data register (RD)
The following table shows the refresh read time with an R_CPU used.
■When "Target" is a specified device
Calculate the refresh read time according to the number of items and the number of their transfer data (word) that are set to
be refreshed. For the calculation method, refer to the following.
 MELSEC iQ-R CPU Module User's Manual (Application)
In addition, substitute the following values in the calculation formula to calculate the refresh read time.
*1 This value is the time with an R_CPU used.
Ex.
If all the 1184 items (1344 words in total) of the RD77MS16 are set in the refresh read settings
1184  0.98 + 0.05  1344 + 11.6 = 1239.12 s
The refresh read time, therefore, is 1239.12 s.
Setting value Description
At the Execution Time of END Instruction Performs refresh at END processing of the CPU module.
At the Execution Time of Specified Program Performs refresh at the execution of the program specified with "Group [n] (n: 1-64)".
Classification Number of the
axis set
When using the refresh settings
Refresh read time 1 22.58 s
233.56 s
344.54 s
455.52 s
566.50 s
677.48 s
788.46 s
899.44 s
9110.42 s
10 121.40 s
11 132.38 s
12 143.36 s
13 154.34 s
14 165.32 s
15 176.30 s
16 187.28 s
Item Description
Number of refresh settings The number of items that are set to be refreshed
Refresh time (A) of each of the first to nth set items 0.05 s per one word of each of the first to nth set items
*1