Mitsubishi Electric MELSEC iQ-R Series - Random Read and Write

8 DEVICE ACCESS
8.3 Random Read and Write
99
8
8.3 Random Read and Write
Read or write device values by specifying the device numbers. It can be specified with discontinuous device numbers.
Random read in word units (command: 0403)
Read values from devices in word units and double word units. It can be specified with discontinuous device number.
When accessing any of the following devices, use the device extension specification (subcommand: 008).
• Link direct device
• Module access device
• CPU buffer memory access device
For the message format for device extension specification, refer to the following section.
Page 438 Read/Write by Device Extension Specification
Message format
The following shows the message format of the request data and response data of the command.
■Request data
■Response data
The value of read device is stored in word units and in double word units. The data order differs between ASCII code or binary
code. (Page 74 Read data, write data)
Data specified by request data
■Command
Frame ASCII code Binary code
4C/3C/4E/3E frame
2C frame 
Number of word access
points (m points)
Number of double word
access points (n points)
Command Subcommand
Monitor condition
specification
designation
Device
(first point)
Device
(mth point)
Device
(first point)
Device
(nth point)
Device for word access Device for double word access
Data read (first point) Data read (mth point) Data read (first point) Data read (nth point)
Read data in word units Data read in double word units
0
30H
4
34H
0
30H
3
33H
03 H 04 H
5
35H