Mitsubishi Electric MELSEC iQ-R Series User Manual page 438

Refresh processing time
A refresh processing time (s) is a constituent of the scan time of CPU module. For details on the scan time, refer to the
following manual.
MELSEC iQ-R CPU Module User's Manual (Application)
The refresh processing time (s) , which is taken for the refresh, is given by:
• Refresh processing time (s) = Refresh read time (time for transferring refresh data to the CPU module) + Refresh write
time (time for transferring refresh data to the Intelligent function module)
The refresh read time and refresh write time vary depending on the settings of "Target".
■When "Target" is "Module Label" or "Refresh Data Register (RD)"
The following table shows the refresh read time and refresh write time with an RCPU used.
Classification
Refresh read time
Refresh write time
■When "Target" is "Device"
Calculate the refresh read time and refresh write time according to the number of items and the number of their transfer data
(in units of word) that are set to be refreshed. For the calculation method, refer to the following manual.
 MELSEC iQ-R CPU Module User's Manual (Application)
In addition, substitute the following values in the calculation formula to calculate the refresh processing time.
Item
Number of refresh settings
Refresh time (A) of each of the 1st to nth set items
Refresh time (B) of each of the 1st to nth set items
*1 This value is the time with an RCPU used.
Ex.
When all the 48 items (1068 words in total) are set in the refresh read settings
48  0.98 + 0.05  1068 + 11.6 = 112.04 s
The refresh read time, therefore, is 112.04 s.
Ex.
When all the 2 items (1022 words in total ) are set in the refresh write settings
2  0.58 + 0.01  1022 + 9.10 = 20.48 s
The refresh write time, therefore, is 20.48 s.
26 PARAMETER SETTING
436
26.2 Module Parameters
Refresh processing time
80.80 s
20.48 s
Description
Number of items that are set to be refreshed
0.05 s per one word
0.01 s per one word
*1
*1