Advertisement
7. TRUOBLESHOOTING
MELSEC-A
7.4
If Digital Output Values Cannot be Read
Check Point Corrective Action
The RUN LED is flashing or turned OFF.
See Section 7.2.
The User's Manual for
The ERROR LED of the CPU module is flashing or
turned ON.
the respective CPU
module gives error
content details.
The User's Manual for
The RUN LED of the CPU module is flashing or
turned OFF.
the respective CPU
module gives error
content details.
I
When an APCCPU is
used
:
The RD/SD LED of the
content details.
(NORMAL).
Manual gives error
CPU module is flashing
The A2CCPU User's
~~~~
-~ -~
~
~
~
The MINI-S3 link
program to turn ON the communications s
Set the sequence
tions start signal.
ON.
MINI-S3 link communica-
signal Y(n+28) is turned
When an AJ71 PT32-S3
error
content
details.
OFF.
User's Manual gives
master module is turned
is used:
The AJ71 PT32-S3
The RUN LED of the
The RD/SD LED of
The AJ71 PT32-S3
the master module is
User's Manual gives
flashing (NORMAL).
error content details.
Visually check the PtlOO
The Pt100 is broken or disconnected.
and disconnection-
detected signals to
confirm the faulty parts.
7.5
When Detected Temperature Values are not Normal
I
Check
Point
Corrective
Action
Is
the conversion-enabled/disabled
correctly specified?
Inspect the A64RDC buffer allocation
and correct the conversion-enabled/
disabled specification.
I
A64RDC correctly connected?
Are the cables linking the Ptl
00 to the
the connections visually,
7.6
When the READY Signal is not Turned ON
I
Check
item
I
Corrective
Action
I
I
is there an error in the PC CPU?
Correct it according to the appropriate.
User's Manual for the CPU module.
I
I
Are the TEST terminals open?
Open the TEST terminals after making
an
error
compensation.
I
7 - 4
Advertisement
