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11.
TROUBLESHOOTING
MELSECIA
L.
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c
11.
TROUBLESHOOTING
This chapter describes errors which can occur with the AJ71C24 proce-
dures.
L
11.1
NAK
Error
Codes
with
Dedicated Protocols
i-
r
L.
I
Table 11.1 gives the error codes and their descriptions when the NAK code
is transmitted between the computer and the PC CPU as 2-digit ASCII
(hexadecimal) between
OOH
and
FFH.
If
several errors occur simultaneously, the code with the lowest number takes
precedence and is transmitted.
If
any of the following errors occur, the transmission sequences are initial-
ized and LEDs 2-N3U and 4-NEU (LED Nos. 4 and 7) are turned ON.
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L-
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L
..
Table
11.1
Error
Code List
corr~~
~1)
Start communication88
after turning
ON
SW22.
:2) Write parameters after ret-
ting the PC CPU to
STOP.
Check control protocol,
change the SW retting or
data.
Chock data tranrmitted from
computor and rum chock
result. Correct invalid data.
Check and correct the mode
retting mitch podtion and
control protocol and restart
data communiutionr.
Change the retting of
SWl8
or
tho control protoool.
Decrease tho data transmis-
sion aped and restart data
communic.tionr.
(1)
Check and correct the char-
acter area A,B, or C and ror-
tart data communications.
(2)
See
the functions list in Soc.
tion
3.3.1
and the ACPU
Uwr’s Manual to correct
the designated commandr,
and restart data communica.
tions.
(3)
See
Section
8.7.1
to correct
the number
of
setting char-
acters of the device num-
ber, and restart data
communications.
Error
Dacripkn
Invalid access ha8 boon made during RUN.
(1)
Data ha8 been written to a PC CPU with
(2) Sequence program and parameters have
Parity error
tho
SW22
OFF (write diublo during RUN).
boon written.
With the
SW1S
ON
(parity enablod), the
state of
SW17
(oddleven parity).
parity check result does not match the
Sum check orror
With the
SW21
ON
(sum check enabled),
the sum chock result
of
received d.ta
does not match the rum check
cod.
of
transmitted data,
Le.,
send data is dif-
ferent from received data.
Communications protocol not valid.
Communications have been made with a
protocol different from the one set by the
mode setting switch.
Framing error
Data does not match the setting of
SW18
(stop bit).
Overrun error
AJ71
C24
recoives all the preceding data.
New data haa been transmitted before
Character area
A,
B,
or
C error, or designated
command does not exist.
(1)
The designation of tho character area
A,
8,
or
C for the control protocol
set
with the
mode retting switch is not correct.
(2)
A
command used with the protocol does
not exist.
The number of processing points
is
outside
the allowable range, or the dorignatod
device number does not exist in the desig-
nated PC CPU.
The set device number does not exist in the
set PC CPU.
quired number
of
characters.
(ACPU common command: 5 characters,
AnACPU dedicated command:
7
characters)
(3) The device number
is
not set with the re-
11
-1
P
Disable
during
RUN
OOH
c.
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~
01
H
Parity
error
L.
~~
Sum
check
error
Protocol
error
Framing
error
WeD’71
2-PE
(LED
No.21)
02H
03H
04H
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c
Overrun
error
05H
06H
L.
P-
L-.
P
2PRo
(LED
No.18)
4-PRO
(LED
No.22)
i.
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