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11. TROUBLESHOOTING
MELSEC-A
1
Error
07H
Character
error
PC CPU
08H
access
/
PC CPU
10H
number
1 1 H
Mode erro!
12H
18H
Remote
error
Special
function
module
designa-
tion error
13H
Special
21H
function
module
Program
step
number
designa-
tion error
I
bus error
Error Description
Character error received.
A character other than 'A l o
2'.
'0 to 9'.
'
'
an0 conlro cooes n Sectnon 8
4
5
( 1 )
has
been
Buffer memory is unable to make communica-
tions with the PC CPU.
The PC CPU is not the type mentioned i n
Section 2.2.
Defined PC CPU number does not exist.
The PC CPU number designated with the
protocol was not the self (FFH) or a station
number set with the MELSECNET link
parameters.
Incorrect communications between an
AJ71 C24 and a PC CPU.
Atter the AJ71 C24 has correctly received a
request from the computer, normal data
communications is not performed between
the AJ71 C24 a n d PC CPU due t o noise or
some other reason.
Special function module designation error.
A spec a l t d n c l ~ o n moddle, havmg o ~ f f e r
memory a n d c3paoIe o f perform ng aara
communtcnt
ons is
no1 plscca n 1nc
dcslanaled s ~ c c al fdnctmn m o d ~ l c
numiber's pokition. Or the module number
i s wrong.
Error in the designation of a sequence pro-
gram step number.
A step number was designated which lies
outside the program range designated by
the PC CPU parameters.
Remote RUNISTOP impossible.
Remote STOPIPAUSE has already been ex-
ecuted from another module (such as
another AJ71 C24).
Access was made to a stat
on
with
r i h c n
commun callons has been dlsconllnded
Memory access to the special function module
cannot be made (for command TR,
TW).
(1) Special function module control bus error.
(2) Special function module breakdown.
Indicator
LED No.
2-PRO
(LED No.18)
4-PRO
(LED No.22)
2-CIN
(LED No.16)
4-CIN
(LED No.20)
2-CIN
(LED No.16)
4-CIN
(LED No.20)
2-CIN
(LED No.16)
4-CIN
(LED No.20)
2-PRO
(LED No.18)
4-PRO
(LED No.22)
2-PRO
(LED No.18)
4-PRO
(LED No.22)
2-CIN
(LED No.16)
4-CIN
(LED No.20)
2-CIN
(LED No.16)
4-CIN
(LED No.20)
Corrective Actions
Check a n d correct data.
Use a PC CPU which can per-
form data communications.
Change the PC CPU number
to the self (FFH) or a station
number set with the MELSEC-
NET link parameters, a n d res-
tart data communications.
Restart data communications.
If the error recurs, (a) check
for noise andlor other causes,
or (b) replace the AJ71C24.
Restart data communications.
Check control protocol data
or change the special func-
tion module location.
Designate a step number
which lies within the desig-
nated range, or change the
parameters and restari trans-
mission.
Check for a n d reset remote
STOPIPAUSE from another
module.
Check t h e state of data link.
PC CPU, base unit, special
function module or AJ71C24
hardware fault. Consult the
nearest Mitsubishi repre-
sentative.
piq
(1) Error codes OOH t o 08H are transmitted to a computer after diagnosis by an AJ71C24, when
access is made by the computer to the AJ71C24.
(2) Error codes 10H to 21H are transmitted from an AJ71C24 to a computer after diagnosis by
a PC CPU when access is made b y an AJ71C24 t o t h e PC CPU.
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