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27 TROUBLESHOOTING
27.1 Checking Module Status
Data communication status (transmission sequence status) reading method
The following shows how to read the current data communication status using the MC protocol stored in the buffer memory.
This read processing is for checking the data communication status using the MC protocol when a transmission problem
occurs.
■Transmission sequence status (Un\G597/613)
The status of data communication using the MC protocol is stored as a numeric value as shown below.
The following shows the correspondence between the numerical values in the transmission sequence status storage area and
the data communication status.
• Remarks
When the target interface is not set to use the MC protocol, '0' is stored in the 'Transmission sequence status' (Un\G597/613).
09
90
b15 b6
(Information on the CH1 side)
Buffer memory address
(Information on the CH2 side)
Un\G597
Un\G613
to
to
to
103456
2
E
N
Q
HL
Request from a target device
Station
number
Message wait
Target device
ACK
or
NAK
Request
to CPU
"6" "1"..."6" is repeated afterward.
Response
from
CPU
Stored
value
Values 7 to 9 are stored when "mode
switching" or "initialization
of transmission sequence" is performed.
C24
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