Reading Device Memory And Buffer Memory (Read: Server) - Mitsubishi Electric A1SJ71PB96F User Manual

7. COMMUNICATION THAT DO NOT REQUIRE
THE SEQUENCE PROGRAM
7.1.10
A "Read" service is issued by the client to read the PC CPU device memory and special functions
module buffer memories.
The device memories to be read must be registered in advance in the OD as an Array, Simple
Variable, or Record using the software package. In addition, the buffer memory must be registered in
the OD as an Array or Simple Variable.
[Parameters required by the client]
• Access Specification
• Subindex
[Server (AJ71PB96F/A1SJ71PB96F) answer parameters]
• Data

Reading device memory and buffer memory (Read: Server)

Read device specifications are executed by Index or Name.
Access Specification
Index
Variable Name
This specifies which element will be read when an Array or Record is read.
If a Subindex is not specified then all the elements will be read.
The Array or Record header element Subindex is 1.
This sets the value of the variable to be read.
The data arrangement when a bit-String is conducted using the following specifications, so
be careful.
When accessing from the M100 using a 16 unit bit-String
MSB
0 M100 M101 M102
M108 M109 M110
1
In addition, in PROFIBUS-FMS the unit used to read Bit-String data is 8 bits. In other words,
bit lengths that do not equal multiples of 8, such as 3 bits or 4 bits, are not read.
Setting value
Index of the variable to be read
Name of the variable to be read
LSB
M103 M104 M105 M106
M111 M112 M113 M114
7-14
M107
M115
MELSEC-A