Batch read in bit units (command: 0401)
Read values from devices in bit units.
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
Command
Subcommand
■Response data
The value of read device is stored in bit units. The data order differs between ASCII code or binary code. (Page 74 Read
data, write data)
Data specified by request data
■Command
Frame
4C/3C/4E/3E frame
2C frame
■Subcommand
Type
For MELSEC-Q/L series
For MELSEC iQ-R series
For 2C frame, the specification is not required. Functions and specification methods are equivalent to the subcommands for
MELSEC-Q/L series.
8 DEVICE ACCESS
92
8.2 Batch Read and Write
Number of
Head device
device points
ASCII code
0
4
0
1
30
34
30
31
H
H
H
H
1
31
H
ASCII code
0
0
0
1
30
30
30
31
H
H
H
H
0
0
0
3
30
30
30
33
H
H
H
H
Binary code
01
04
H
H
Binary code
01
00
H
H
03
00
H
H