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1. OUTLINE
(c) Reading communication error information
PLC CPU
Device
D, R
Device
D, R
*: Stores the status of each slave station during I/O communication.
DN91
TO
Message
communication
command area
Slave information
storage area
FROM
Message
communication
result area
Message
FROM
communication
data area
(Up to 240 byte)
−
1
8
MELSEC-A
Slave station
I/O
communi-
cation
Class 1
Instance
Attribute
Attribute
*
Class
Instance
Attribute
Attribute
Attribute
Instance
Attribute
Attribute
Attribute
Instance
Attribute
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Troubleshooting
