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26 PARAMETER SETTING
26.2 Module Parameters
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 RCPU used.
■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.
*1 This value is the time with an RCPU used.
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.
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.
Classification Refresh processing time
Refresh read time 80.80 s
Refresh write time 20.48 s
Item Description
Number of refresh settings Number of items that are set to be refreshed
Refresh time (A) of each of the 1st to nth set items 0.05 s per one word
*1
Refresh time (B) of each of the 1st to nth set items 0.01 s per one word
*1
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