Master Function (Message Communication Function) - Mitsubishi Electric QJ71DN91 User Manual

Melsec q series, devicenet master-slave module
Hide thumbs Also See for QJ71DN91:
Table of Contents

Advertisement

4 FUNCTIONS

4.2 Master Function (Message Communication Function)

4 - 9
The QJ71DN91 can read or write attribute data of slave nodes using its own buffer
memory.
For details of other message communications, refer to DeviceNet Common Service in
DeviceNet Specifications (Release 2.0).
At one time, 240 bytes of message data can be transferred.
For the execution timing, refer to Section 3.3.2 (3).
(1)
Get Attribute
Programmable controller CPU
TO
SET Y12
FROM
X02
X05
FROM
X02
X05
Message Comm.
Completion
*: In DeviceNet, the areas used for reading and writing by communication
are specified by the numbers such as class ID, instance ID, and attribute
ID. For details, refer to the manual of each slave node.
1)
Set command data in Message Communication Command (address:
0110
H
2)
Set Message Communication Request (Y12) to on to read out attribute
data from the slave that is specified in the command data.
3)
The attribute data of the slave node are stored in Message
Communication Data (address: 0130
4)
Upon completion of reading, the processing result is stored in
Message Communication Result (address: 0120
Message Communication Completion (X02) is set to on.
5)
The slave node's attribute data stored in Message Communication
Data (address: 0130
controller CPU.
6)
If failed, Message Communication Error Signal (X05) is set to on.
Read data in Message Communication Result (address: 0120
012F
QJ71DN91
0110
H
Message
1)
Comm.
Command area
011F
H
Message Comm.
2)
Request
0120
H
Message
6)
Comm.
Result area
012F
H
0130
H
Message
Comm.
Data area
01A7
H
Message
4)
communication
complete
5)
to 011F
).
H
to 01A7
H
) to identify the cause of the error.
H
Slave node (MAC ID)
Class
2)
Instance
3)
Class
Instance
to 01A7
).
H
H
to 012F
H
) are read out to the programmable
H
MELSEC-Q
Attribute
Attribute
Instance
Attribute
Attribute
Instance
Attribute
Attribute
Attribute
), and
H
to
H
4 - 9

Advertisement

Table of Contents
loading

Table of Contents