Mitsubishi Electric Melsec iQ-R Series User Manual page 79

Description
■Step 3: Checking the input range setting
Check whether the input range appropriate
to the analog input is set.
*1 Monitor the buffer memory areas using "Device/Buffer Memory Batch Monitor" or "Intelligent Function Module Monitor".
If digital output values cannot be read even after the above actions are taken, the possible cause is a failure of
the A/D converter module. Please consult your local Mitsubishi representative.
Check item 1
The program for reading digital output values has an error or the CPU module is in the STOP state. Check the following items.
Check item
Check whether the program for reading digital output values has
an error.
Check whether the auto refresh setting is correct.
Check whether the CPU module is in the STOP state.
Check item 2
The A/D conversion is not executed. Check the following items.
Check item
Check whether A/D conversion disable (1) is set in 'CH1 A/D
conversion enable/disable setting' (Un\G500) of the channel
where a value is to be input.
Check whether 'Operating condition setting request' (Y9) has been
executed after parameter changes.
*1 If 'Operating condition setting request' (Y9) is on, the A/D conversion does not start. Therefore, first turn on 'Operating condition setting
request' (Y9), check the off state of 'Operating condition setting completed flag' (X9), and turn off 'Operating condition setting request'
(Y9).
Procedure
Ó
Check the stored value in 'CH1 Range
setting monitor' (Un\G430).
Is the set input range
matched with the
analog input?
NO
The analog input is not matched with the
input range setting.
Check item 5
Action
Check 'CH1 Digital output value' (Un\G400) using the monitor functions of the engineering
tool ("Device/Buffer Memory Batch Monitor" or "Intelligent Function Module Monitor"). If
the digital output value corresponding to the analog input is stored, review and correct the
program for reading digital output values.
If the value in 'CH1 Digital output value' (Un\G400) is transferred to a device of the CPU
module with the auto refresh, review and correct the auto refresh setting.
Change the state of the CPU module to RUN.
Action
Check 'CH1 A/D conversion enable/disable setting' (Un\G500) using the monitor functions
of the engineering tool ("Device/Buffer Memory Batch Monitor" or "Intelligent Function
Module Monitor"). When 'CH1 A/D conversion enable/disable setting' (Un\G500) is set to
A/D conversion disable (1), change it to A/D conversion enable (0) with the engineering
tool or a program.
Turn on and off 'Operating condition setting request' (Y9)
check that a digital output value is stored in 'CH1 Digital output value' (Un\G400).
If the stored value is correct, further check the program to verify the description of
'Operating condition setting request' (Y9).
Monitor the buffer memory area with the
*1
monitor function of the engineering tool.
Check and correct the wiring and
YES offset/gain setting.
Check item 4
*1
with the engineering tool and
4 TROUBLESHOOTING
4.3 Troubleshooting by Symptom
4
77