Access Units - Mitsubishi Electric MELSEC iQ-R Series User Manual

Access units

The following table shows the number of accessible device points (access units) in one process (one scanning) when
accessing the device memory in a CPU module.
Note that the device memory is accessed in device tag component units when setting any of the following jobs in which only
continuous array tags are used and operating an RD81MES96N.
 Page 38 Job setting 1, Page 38 Job setting 2, Page 38 Job setting 3
Access units differ from those shown in the following table when setting any of the jobs shown in the above sections and
operating an RD81MES96N. (Page 37 Setting a job in which only continuous array tags are used)
Access target device type (series)
RCPU Programmable
controller CPU
Process CPU
C Controller module
*4
QCPU (Q mode)
LCPU
FX5CPU
FXCPU
*1 For access without using an Ethernet port of an MES interface module
*2 For access by using an Ethernet port of an MES interface module
*3 8192 points when using an RD81MES96N with firmware version '02' or earlier, or an RD81MES96
*4 Access units differ for each module type. When data inconsistency is a problem, select "Single Handshake" or "Multiple Handshake" for
a trigger condition.
Setting a job in which only continuous array tags are used
When setting any of the following jobs in which only continuous array tags are used and operating an RD81MES96N, the
device memory is accessed in device tag component units.
 Page 38 Job setting 1, Page 38 Job setting 2, Page 38 Job setting 3
The following table shows the access units when setting any of the jobs shown in the above sections and operating an
RD81MES96N.
Access target device type (series)
RCPU Programmable
controller CPU
Process CPU
C Controller module
*2
QCPU (Q mode)
LCPU
FX5CPU
FXCPU
*1 8192 points when using an RD81MES96N with firmware version '02' or earlier
*2 Access units differ for each module type. When data inconsistency is a problem, select "Single Handshake" or "Multiple Handshake" for
a trigger condition.
*3 For access without using an Ethernet port of an RD81MES96N
*4 For access by using an Ethernet port of an RD81MES96N
Precautions
When accessing the device memory in device tag component units, device values may be obtained from multiple sequence
scans and applied, which may cause data inconsistency.
When data inconsistency is a problem, refer to the following:
Page 38 When data inconsistency is a problem
Device reading
General access
*1
118 points
*2
58 points
*1
96 points
*2
48 points
*1
58 points
*2
29 points
128 points
Device reading
General access
960 points
480 points
*3
32 points
*4
64 points
High-speed access
*3
32768 points
Not supported.
High-speed access
*1
32768 points
Not supported.
2.2 Access Specifications for a CPU Module
Device writing
*1
78 points
*2
38 points
*1
96 points
*2
48 points
*1
38 points
*2
19 points
128 points
Device writing
949 points
480 points
469 points
*3
32 points
*4
64 points
2 SPECIFICATIONS
2
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