29 LATCH FUNCTION
29.1 Latch with Battery
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29 LATCH FUNCTION
29.1 Latch with Battery
The data in each device/label of the CPU module is cleared to its default value in the following cases:
• When the CPU module is powered off and on
• When the CPU module is reset
• When a power failure exceeding the allowable momentary power failure time occurs
The data in each device/label with latch setting is retained by using the battery on the CPU module unit even under the above
described conditions. For this reason, control can be continued with the retained data even if the power of the CPU module is
turned off or a power failure exceeding the allowable momentary power failure time occurs while the data is managed by a
sequential control.
Types of latch
The following types of latch are available:
• Latch (1): Data in this range can be cleared by a latch clear operation
• Latch (2): Data in this range cannot be cleared by a latch clear operation
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