Direct Read (Command: 3B) - Mitsubishi Electric MELSEC IQ-R series Reference Manual

Direct read (command: 3B)

Read extended file register in 1-point (1 word) units by specifying the consecutive device numbers of extended file register.
This command is a dedicated command for AnACPU. (The command is equivalent to AnA/AnUCPU common commands of
1C protocol.)
Message format
The following shows the message format of the request data and response data of the command.
■Request data
Number of device
Device number
■Response data
The data for the number of device points are stored.
(Page 402 Read data, write data)
Data specified by request data
■Device number
Specify the start address of the extended file register to be read. (Page 418 Device number)
■Number of device points
Specify the points of extended file register to be read.
Specify '00H' when the number of device points is to 256 points. (Page 402 Number of device points)
■Fixed value
Fixed to '0'.
ASCII code
0 0
30 30
H H
18 COMMUNICATING USING 1E FRAMES
428
18.5 Read and Write Extended File Register
Fixed
points value
Binary code
00
H