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6. BIDIRECTIONAL
PROTOCOL
COMMUNICATIONS
MELSEC
QnA
6.3
Bidirectional Protocol LED Display Contents
The following shows the QC24 LED display contents related to bidirectional protocol data com-
munications using the system configuration shown in Section 3.1.1.
LED Name
Error Processing
Check the number set
at the mode
switches.
LED Application
Module normal
QC24 operation status dis-
ON
Play
QC24 and PC CPU commu-
(Lights steadily
m u n i c a t i n g
nications status
Blinks while com-
while stopped)
RUN
CPU
ww
Abnormal
Check the status of the PC CPU and ex-
Check the number
set at the mode
ternal device.
switches.
1 -NEU
Noma1
I*
Check the number
set at the mode
switches.
I
Abnomal
I
-C/N
~~
~~~
S o m m u n i c a -
tions normal
Check SW07 (enablekisable write during
RUN).
QC24 and PC CPU commu-
nications status display
Communications
abnormal
Parity error display
Error
I
I
1 -P/S
Normal
Transmission specifications settings and re-
ceive data are not the same.
Make the QC24 transmission specifica-
tions and the external device specifications
the same.
Check the setting of the transmission
specifications switches.
1 -SI0
Normal
Transmission specifications settings and re-
ceive data are not the same.
Make the QC24 transmission specifica-
tions and the external device specifica-
tions the same.
Check the setting of the transmissior
specifications switches.
Decrease the transmission rate.
Decrease the number of data sent from
the external device.
-SD
. WAIT
Sending
No send data
the QC24 sends to the exter-
nal device
1 -SD
3ata not being
If this LED does not blink even even though
external device is sending a command,
*eceived
Displays QC24 to external de- Blinks while data
vice send status
is being sent
1 -RD
CHI. ERR
I
display
0
: Normal state.
If an error is generated, the error LED come ON.
Thereafter, the error LED will remain ON even if the error recovers.
Use the buffer memory (201 H) to turn OFF the error LED.
6 - 6
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