Mitsubishi Electric MELSEC iQ-R-R6SFM - Applicable Devices and Labels

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23 LATCH FUNCTION
23.1 Latch with Battery
Applicable devices and labels
This section describes the devices/labels that can be latched.
Applicable devices
The devices below can be latched. However, local devices cannot.
*1 When "Use Common File Register in All Programs" is enabled, any of the number of points is registered within the range for Latch (2).
Also, the range can be specified in "Latch (2)" of "Latch Range Setting" (values out of the specified range are cleared to 0).
• When "Use File Register of Each Program" is enabled, the latch range for file registers cannot be specified
(the whole range for file registers is retained).
• When the file register file which should be used is changed by the QDRSET instruction, the latch range
setting for file registers is disabled. After the change, the whole range for file registers is retained regardless
of the latch range setting.
Applicable labels
The labels below can be latched.
Device Specification method Applicable latch type
Internal relay (M) Specify the latch range. Latch (1) or Latch (2)
Link relay (B) Specify the latch range. Latch (1) or Latch (2)
Annunciator (F) Specify the latch range. Latch (1) or Latch (2)
Edge relay (V) Specify the latch range. Latch (1) or Latch (2)
Timer (T)/Long timer (LT)/Retentive timer (ST)/Long
retentive timer (LST)
Specify the latch range. Latch (1) or Latch (2)
Counter (C) and Long counter (LC) Specify the latch range. Latch (1) or Latch (2)
Data register (D) Specify the latch range. Latch (1) or Latch (2)
Link register (W) Specify the latch range. Latch (1) or Latch (2)
Latch relay (L) Specify the number of points (latch is performed the same
number of times as the specified number of points).
Latch (2) only
File register (R, ZR) Specify the number of points (latch is performed the same
number of times as the specified number of points). Specify
the latch range.
*1
Latch (2) only
Label type Class
Global label VAR_GLOBAL_RETAIN
Local label of a program block VAR_RETAIN
Local label of a function block VAR_RETAIN
VAR_OUTPUT_RETAIN
VAR_PUBLIC_RETAIN