3-7
Section
Error Processing
62
3-7
Error Processing
3-7-1 Troubleshooting Procedure
Use the following procedure for troubleshooting Analog Input Unit errors.
1, 2, 3...
1. Error occurs.
2. Is the ERROR indicator lit?
Yes: Error detected by Analog Output Unit
(Refer to
3-7-2 Errors Detected by Analog Output Unit
.)
No:
Go to the next step.
3. Is the RUN indicator lit?
Yes: Error detected by CPU Unit
(Refer to
3-7-3 Errors Detected by CPU Unit
.)
Check whether the operation mode switch on the back of the Analog
Output Unit is set correctly.
No:
Refer to
3-7-5 Troubleshooting
.
If both the ERROR and RUN indicators are lit, check whether the operation
mode switch on the back of the Analog Output Unit is set correctly.
3-7-2 Errors Detected by Analog Output Unit
When an error occurs at the Analog Output Unit, the ERROR indicator on the
front panel of the Unit lights and the error code is stored in bits 08 to 15 of IR word
n+9.
15
14
13
12
11
10
09
08
07
06
05
04
03
02
01
00
Bit
Word n+9
Error code
Disconnection detection flags
for output numbers 1 to 8.
For the IR word addresses, n = 100 + 10 x unit number.
For Units #A to #F (10 to 15), n = 400 + 10 x (unit number – 10).
Error
code
Error contents
Countermeasure
8
1
In adjustment mode, adjustment
cannot be performed because the
specified input number is not set
for use or because the wrong
input number is specified.
Check whether the word n input
number to be adjusted is set from
11 to 18.
Check whether the input number
to be adjusted is set for use by
means of the DM setting.
8
3
The output setting range has been
exceeded.
Correct the set value.
8
8
An EEPROM writing error has
occurred while in adjustment
mode.
Turn the Set Bit OFF, ON, and
OFF again.
If the error persists even after the
reset, replace the Analog Output
Unit.
F
2
The wrong output status for when
conversion is stopped has been
specified.
Specify a number from 0000 to
0002.
Note
Errors indicated with 8
j
codes are automatically reset when proper counter-
measures are taken. The errors indicated with F
j
codes are cleared when the
power is turned on after making the correct settings and when the Special I/O
Unit Restart Bit is turned OFF, ON, and OFF again.
