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14 LATCH FUNCTION
14.5 Precautions
14.5 Precautions
The precaution to be taken when using a latch function is described below.
• When latch range and device no. of points are changed in the parameter, the latching for devices other than link register
(W) and latch label will be the same as the latch settings before the change. Also, if the latch range setting parameter at the
time of previous operation is different from that at the time of the current operation after the CPU module is powered OFF
and ON or reset, the latch data is recovered only in the overlapping part of the latch ranges.
• When latch range and the number of devices are changed in the parameter, all latch labels are cleared to "0".
• When the CPU parameter, program file, FB file, and global label setting file are changed, all latch labels are cleared to "0".
• Special relays and special registers are not cleared even by performing CPU memory operation or special relay clearing.