Mitsubishi Electric MELSEC iQ-R Series User Manual page 30

Shortening the link refresh time and transmission delay time
The link refresh time and transmission delay time can be shortened by reducing the number of link refresh points to the CPU
module. The following methods can be used to reduce the number of the link refresh points.
• In "Link Refresh Settings" under "Basic Settings", set only the link devices used in the CPU module as the link refresh
range. ( Page 62 Link Refresh Settings)
• Directly access infrequently used link devices through module access devices from the program, and remove the
corresponding settings from the link refresh range.
Setting method
The link refresh is assigned in "Link Refresh Settings" under "Basic Settings". ( Page 62 Link Refresh Settings)
Precautions
■Latched devices of the CPU module
Even if latched device (listed in "Devices of the CPU module" in the table below) data are cleared to 0 using a program when
the CPU module is reset or powered off and on, the latched data may be output depending on the timing of a link scan and link
refresh.
For how to prevent output of latched device data, perform actions listed in "How to disable the setting" in the table below.
Devices of the CPU module
Latch relay (L)
File register (R, ZR)
Extended data register (D)
Extended link register (W)
Device in the latch range
*1 For the initial device value setting of the CPU module, refer to the following.
 GX Works3 Operating Manual
1 FUNCTIONS
28
1.1 Cyclic Transmission
How to disable the setting
Clear the value of the device to 0 using the initial device value.
Delete all latch range settings.
*1