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MELSEC-Q
11 TROUBLESHOOTING
(3) Checking by GX Configurator-SC
Have the "Monitor/test others" screen displayed.
For displaying the screen, see Section 9.6.10 of the User's Manual (Basic).
(4) LED ON status and communications error status
Related protocol
No.
Status
signal
name
Description
Description when ON
(when LED is turned
on (1))
Description when OFF
(when LED is turned
off (0))
Initial
state MC
Non
procedure
Bidirectional
protocol
Pre-
defined
1 SD WAIT Transmission wait status
Waiting for data
transmission
Data transmission start OFF
Overrun or framing
error occurred.
OFF
2 SIO
SIO error status
OS area is full.
Received data was
deleted.
Normal
OFF —
3 PRO.
Character error status
Error occurred.
Normal
OFF
—
4 P/S
Status of parity error or
sum check error
Error occurred.
Normal
OFF
5 C/N
Access status with the
programmable controller
CPU
(
1
)
Normal OFF
6 NAK
Abnormal completion
status
Abnormal completion
transmission
Normal completion
transmission
OFF
7 ACK.
Normal completion status
Normal completion
transmission
Abnormal completion
transmission
OFF
8 NEU.
Neutral status
Waiting to receive
command
Neutral Command
reception
(
2
)
—
9 CH2.
ERR
Error occurrence status on
CH2 side
OFF
10 CH1.
ERR
Error occurrence status on
CH1 side
Switch setting error
Mode switching error
Transmission error
Reception error
On-demand error
Flash ROM write error
Flash ROM write count
over limit error
Normal
OFF
1 C/N turns on in the following cases:
• An external device issued a data read request to the programmable controller
CPU when write during RUN is set to prohibit in the switch settings by GX
Developer (see Section 4.5.2).
For functions that cannot be used when write during RUN is set to prohibit, see
the explanation section in each command list of the Reference Manual.
• When an error has occurred during access between the Q series C24 and the
programmable controller CPU.
2 NEU. is valid when a target interface is set to use the MC protocol.
When the target interface is set to other than the MC protocol, the status of NEU.
is off.
Содержание MELSEC QJ71C24
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