Mitsubishi Electric RD77MS2 User Manual page 357

■Refresh group
Set the refresh timing of the specified refresh destination.
Setting value
At the Execution Time of END Instruction
At the Execution Time of Specified Program
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.
Classification
Refresh read time
■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.
Item
Number of refresh settings
Refresh time (A) of each of the first to nth set items
*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.
Description
Performs refresh at END processing of the CPU module.
Performs refresh at the execution of the program specified with "Group [n] (n: 1-64)".
Number of the When using the refresh settings
axis set
22.58 s
1
33.56 s
2
44.54 s
3
55.52 s
4
66.50 s
5
77.48 s
6
88.46 s
7
99.44 s
8
110.42 s
9
121.40 s
10
132.38 s
11
143.36 s
12
154.34 s
13
165.32 s
14
176.30 s
15
187.28 s
16
Description
The number of items that are set to be refreshed
0.05 s per one word of each of the first to nth set items *1
10 PARAMETER SETTING
355
10.2 Module Parameters
10