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15 LATCH FUNCTION
15.4 Clearing of Data of the Latch Range
Setting latch on labels
This subsection describes latch setting on labels.
15.4 Clearing of Data of the Latch Range
The data of the latch range can be cleared by the following ways.
Method of latch clearing
By using engineering tools. (GX Works3 Operating Manual)
[Online] [CPU memory operation]
The range cleared can be selected by performing CPU memory operation.
• Clear the devices outside the latch range.
• Clear the devices outside the latch range and the devices within the range of latch (1).
• Clear the devices outside the latch range, the devices within the range of latch (1) and the devices within the range of latch
(2).
Method of clearing by program
■Clearing by program
Execute an RST command to a latched device or clear by sending K0 in MOV/FMOV instructions.
■Clearing by special relay (SM8031 or SM8032)
• SM8031: Clear the devices outside the latch range.
• SM8032: Clear the range of latch (1) and the range of latch (2).
Label edit window
1. In the label edit window, specify
"RETAIN" for label attribute.
"Device/Label Memory Area Detailed Setting" window
2. There are two types of latch for
labels: latch (1) and latch (2).
Select one. The selected latch
type is applied to all labels of with
latch attribute.
Navigation window
[Parameter] [Module model
name] [CPU Parameter]
"Memory/Device Setting"
"Device/Label Memory Area
Detailed Setting" "Latch Label
Latch Type"
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