Mitsubishi MELSEC LJ71C24, User Manual

Page: 274 / 428

15 - 5 15 - 5
15 TROUBLESHOOTING
(g) ACK.
Indicates "Normal completion status".
Value Status Description
0001(ON) Normal
completion
transmission
When the C24 could receive data normally, the C24
sent a response message (ACK message) to the
external device to notice the normal completion.
0000(OFF) Abnormal
completion
transmission
When the C24 could not receive data normally, the
C24 sent a response message (NAK message) to the
external device to notice the abnormal completion.
(h) NEU.
Indicates "Neutral status".
NEU. is valid when a communication protocol on CH side is set to use the
MC protocol.
When the communication protocol is set to other than the MC protocol, the
status of NEU. is off.
Value Status Description
0001(ON) Neutral Waiting for command message to be received.
0000(OFF) Command
reception
Command message being received.
(i) CH2 ERR.
Indicates "Error occurrence status on CH2 side".
Value Status Description
0001(ON) • Switch setting error
• Mode switching error
• Transmission error
• Reception error
• On-demand error
• Flash ROM write error
• Flash ROM write count over
limit error
The errors in the left column occurred
on the CH2 side.
Keeps its on-status even after the
communication returns to normal.
Initialize the error information as
necessary.
For details, refer to Section 15.1.2.
0000(OFF) Normal -
(j) CH1 ERR.
Indicates "Error occurrence status on CH1 side".
Value Status Description
0001(ON) • Switch setting error
• Mode switching error
• Transmission error
• Reception error
• On-demand error
• Flash ROM write error
• Flash ROM write count over
limit error
The errors in the left column occurred
on the CH1 side.
Keeps its on-status even after the
communication returns to normal.
Initialize the error information as
necessary.
For details, refer to Section 15.1.2.
0000(OFF) Normal -