Mitsubishi Electric MELSEC iQ-RJ71C24-R2 - Page 444

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27 TROUBLESHOOTING
27.1 Checking Module Status
Displayed items
■Buffer memory area for the display contents
■SD WAIT
SD WAIT indicates "Transmission wait status".
■SIO
SIO indicates "SIO error status".
■PRO.
PRO. indicates "Character error status".
■P/S
P/S indicates "Status of parity error or sum check error".
Value Status Description
0001 (ON) Waiting for data transmission C24 got into a state in which data cannot be sent to a target device (waiting for data
transmission) by the transmission control of C24.
• The transmission cannot be started.
• A transmission terminate request (receiving DC3/DR(DSR) signal OFF) is received from
the target device during data transmission.
0000 (OFF) Data transmission available The transmission became available, and the data transmission is started/resumed.
Value Status Description
0001 (ON) Overrun or framing error occurred Overrun or framing error occurred.
Keeps the ON-status even after the communication returns to normal. Initialize the error
information as necessary.
Page 473 Error Code List
OS area is full. No free space is available in the OS area, and the received data was discarded.
Keeps the ON-status even after the communication returns to normal. Initialize the error
information as necessary.
Page 473 Error Code List
0000 (OFF) Normal 
Value Status Description
0001(ON) Error occurred Character error occurred.
Keeps the ON-status even after the communication returns to normal. Initialize the error
information as necessary.
Page 473 Error Code List
0000(OFF) Normal 
Value Status Description
0001(ON) Error occurred Parity error or sum check error occurred.
Keeps the ON-status even after the communication returns to normal. Initialize the error
information as necessary.
Page 473 Error Code List
0000(OFF) Normal 
b0b1b2b3b4
1/0
1/0
1/01/01/0
1/01/01/0
b15 b6
1/0
1/0
1/0
1/0
SD WAIT
SIO
PRO.
P/S
C/N
NAK
1/0
1/0
b5b7
1/0
1/0
b8
ACK.
NEU.
(Information on the CH1 side)
Buffer memory address
(Information on the CH2 side)
For system
1: LED ON, error
0: LED OFF, no error
Un\G513
Un\G514
to