Applicable Devices And Labels - Mitsubishi Electric MELSEC iQ-R-R00CPU User Manual

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.
Device
Internal relay (M)
Link relay (B)
Annunciator (F)
Edge relay (V)
Timer (T)/Long timer (LT)/Retentive timer (ST)/Long
retentive timer (LST)
Counter (C) and Long counter (LC)
Data register (D)
Link register (W)
Latch relay (L)
File register (R, ZR)
*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.
Label type
Global label
Local label of a program block
Local label of a function block
23 LATCH FUNCTION
388
23.1 Latch with Battery
Specification method
Specify the latch range.
Specify the latch range.
Specify the latch range.
Specify the latch range.
Specify the latch range.
Specify the latch range.
Specify the latch range.
Specify the latch range.
Specify the number of points (latch is performed the same
number of times as the specified number of points).
Specify the number of points (latch is performed the same
number of times as the specified number of points). Specify
*1
the latch range.
Class
VAR_GLOBAL_RETAIN
VAR_RETAIN
VAR_RETAIN
VAR_OUTPUT_RETAIN
VAR_PUBLIC_RETAIN
Applicable latch type
Latch (1) or Latch (2)
Latch (1) or Latch (2)
Latch (1) or Latch (2)
Latch (1) or Latch (2)
Latch (1) or Latch (2)
Latch (1) or Latch (2)
Latch (1) or Latch (2)
Latch (1) or Latch (2)
Latch (2) only
Latch (2) only