Device Specification With Global Labels/Common Device Comments; Access Units - Mitsubishi Electric MELSEC iQ-R Series User Manual

Device (device name)
CPU buffer memory access
device
*1 Specified by QCPU (Q mode) or LCPU only.
*2 A device name for QCPU (Q mode) and LCPU.
Device specification with global labels/common device
comments
A device can be specified with a global label/common device comment by importing global labels (including module labels)/
common device comments set in an engineering tool to a project of Configuration Tool.
For details on importing labels, refer to the following:
MELSEC iQ-R High Speed Data Communication Module User's Manual (Application)

Access units

The following table shows the number of device points (access units) that can be accessed in a single process when sampling
the device values in the CPU module.
When the number of sampling device points are within the access units, the device values of the same sequence scan are
sampled.
Since device values are sampled over multiple sequence scans when the number of sampling device points exceed the
access units, data inconsistency (old data and new data overlap) may occur.
To prevent data inconsistency, set the number of devices sampled at one time within the access units, or use high speed
sampling.
Series
RCPU Programmable controller
CPU
Safety CPU
Process CPU
C Controller module
QCPU (Q mode) Excluding basic model
QCPU
Basic model QCPU
C Controller module
LCPU Programmable controller
CPU
*1 When accessing from other than the Ethernet port of a high speed data communication module
*2 When accessing from the Ethernet port of a high speed data communication module
*3 To prevent data inconsistency, use the MELSEC data link functions such as mdSendEx to write devices of the C Controller.
*4 Refers to Q00JCPU, Q00CPU, and Q01CPU
2 SPECIFICATIONS
30
2.2 Access Specifications for a CPU Module
CPU buffer memory access device
(U3En\G)
CPU buffer memory access device (fixed
cycle communication area) (U3En\HG)
High speed
sampling
Samples all device
values in the same
sequence scan.
Not supported.
*3
*4
*3
Bit specification


General sampling Data read
*1
118 points
*2
58 points
*1
96 points
*2
48 points
64 points
*1
96 points
*2
48 points
*1
96 points
*2
48 points
Digit specification


Data write
*1
78 points
*2
58 points