Setting Latch On Labels; Clearing Latch Range Data; Precautions - Mitsubishi Electric MELSEC iQ-R Series User Manual

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Setting latch on labels

This section describes latch setting on labels.

Operating procedure

Label edit window

"Device/Label Memory Area Detailed Setting" window

Latch range data is cleared by either of the operations below. ( Page 150 Memory Operation)

• Latch clear: Performed from the engineering tool. ( GX Works3 Operating Manual)

• Latch clear by program: Execute the RST instruction for latched devices, or clear by transferring K0 by using the MOV or

FMOV instruction.

This section describes the precautions when using the latch function.

• If the latch range and number of device points are modified by using parameters, latch is performed on the modified latch

range. However, if the value of the parameter setting the latch range is different between the previous and current

operations because the CPU module was powered off and on or is reset, and the latch range has been increased, the

device range in the increased portion is not latched.

In the label edit window, specify

"RETAIN" for label attribute.

There are two types of latch for labels:

latch (1) and latch (2). Select one. The

selected latch type is applied to labels of

all latch attributes.

[CPU Parameter]  [Memory/Device

Setting]  [Device/Label Memory Area

Detailed Setting]  [Latch Type Setting

of Latch Type Label]

29 LATCH FUNCTION

29.1 Latch with Battery