Mitsubishi Electric MELSEC iQ-R Series User Manual page 517

For device latching, increasing the device range in the device setting of CPU parameters eliminates the latch
processing from the END processing for the devices and enables real-time latching. For example, assume the
following configuration for R08PCPU: (1) 0K word is specified for the file storage area and 168K words for the
device area in "Device/Label Memory Area Capacity Setting", (2) 100K points is specified for the data register
(D) on the "Device Setting" window, and (3) D41088 and later are specified as the latch target devices. In this
configuration, D41088 and later data registers (D) can be latched in real time as well as the devices (W, SW,
and L) which are out of the effective range.
29
(1)
(1) D41088 or later areas of the data register (D) and areas of the devices (W, SW, and L) in disabled ranges
can be latched in real time.
29 LATCH FUNCTION
515
29.1 Latch with Battery