Read Communication Error Information - Mitsubishi Electric A1SJ71DN91 User Manual

4. FUNCTIONS
4.2.3

Read communication error information

*: Stores the status of each slave station during I/O communication.
PC CPU
TO
SET Y(n+1)2
FROM
Xn2
FROM
Xn2
Message communication
complete
1) Set "Read Communication Error Information" in the buffer memory message
communication command area using the sequence program TO instruction.
2) Turn ON message communication request (Y(n+1)2) with a sequence program to read
the accumulated error information from the relevant slave stations to the DN91.
3) DN91 receives data from the slave stations and processes it as follows:
•
The slave station error information set in the message communication command area
is stored in the message communication data area of the buffer memory.
•
The result of processing the message communication is stored in the message
communication results area of buffer memory.
4) When the process result is stored in the message communication results area of buffer
memory, message communication ends and the message communication complete (Xn2)
signal automatically turns ON.
5) The slave station communication error information stored in the buffer memory message
communication data area is read to the PC CPU using the sequence program FROM
instruction.
DN91
0110
H
1)
Message
communication
command area
011F
H
Message communi-
cation request
Slave information
storage area
0120
H
Message
communication
result area
012F
H
0130
H
Message
communication
data area
01A7
H
4)
Message communi-
cation complete
5)
−
4 5
MELSEC-A
Slave station (MAC ID)
I/O Communi-
cation
Class 1
Instance
2)
Attribute
Attribute
3) Instance
Attribute
Attribute
Attribute
Class
Instance
Attribute
Attribute
Attribute
Instance
Attribute