Mitsubishi Electric R60AD8-G - When the Safety Device Value Is the off Value (Equivalent to 0 V;0 Ma); When the Safety Device Does Not Fall Within the Range of Accuracy; When the Module Shuts down

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14 TROUBLESHOOTING
14.3 Troubleshooting by Symptom
When the safety device value is the OFF value (equivalent to 0V/
0mA)
When the safety device does not fall within the range of accuracy
When the module shuts down
If operation is not performed normally even after the actions described above are taken, the possible cause is
a module failure. Please consult your local Mitsubishi representative.
Check item Corrective action
Check whether the R60DA8-G for diagnostics operates normally. Check the error code of the R60DA8-G for diagnostics on the "Module
Diagnostics" window. Refer to the following manual and take actions
described in the list of error codes.
 MELSEC iQ-R Channel Isolated Digital-Analog Converter Module User's
Manual (Application)
Check whether the module parameters of the R60DA8-G for diagnostics are
set correctly.
Check that the module parameters of the R60DA8-G for diagnostics are
correct. For details, refer to the following.
Page 251 Module parameters for "R60DA8-G"
Check whether the 24VDC external power supply is applied to the R60DA8-G
for diagnostics.
Check that the 24VDC external power supply is applied to the R60DA8-G for
diagnostics. For details on how to check, refer to the following.
 MELSEC iQ-R Channel Isolated Digital-Analog Converter Module User's
Manual (Application)
If the 24VDC external power supply is not applied, turn off and on the power
supply to the entire system using SIL2 Process CPUs.
Check whether the RY40PT5B operates normally. Check the error code of the RY40PT5B on the "Module Diagnostics" window.
Refer to the following manual and take actions described in the list of error
codes.
 MELSEC iQ-R I/O Module (With Diagnostic Functions) User's Manual
(Application)
Check whether the module parameters of the RY40PT5B have been changed. If the module parameters of the RY40PT5B have been changed, reset them to
the default values.
Check whether the 24VDC external power supply is applied to the
RY40PT5B.
Check that the 24VDC external power supply is applied to the RY40PT5B. For
details on how to check, refer to the following.
 MELSEC iQ-R I/O Module (With Diagnostic Functions) User's Manual
(Application)
If the 24VDC external power supply is not applied, turn off and on the power
supply to the entire system using SIL2 Process CPUs.
Check whether there is any problem with analog signal lines for modules and
relay, such as looseness or disconnection.
Identify the faulty area by a visual check and continuity check for analog signal
lines and relay of the channel where an error occurred.
Check whether the safety device being read is correct. If a safety device different from the safety device assigned by the refresh
device setting is referred to, digital operation values cannot be read correctly.
Check the refresh device setting, and modify the program so that the safety
device of the channel wanting to be read is referred to.
For details on the refresh device setting, refer to the following.
 MELSEC iQ-R CPU Module User's Manual (Application)
Check whether "A/D conversion disable" is set in "A/D conversion enable/
disable setting" of the channel to be used.
Set "A/D conversion enable" in "A/D conversion enable/disable setting" of the
channel to be used.
Check whether the SIL2 diagnostic FB library in use is correct. Use a correct SIL2 diagnostic FB library. For details on the SIL2 diagnostic FB
library used, refer to the following.
Page 274 SIL2 A/D Conversion Function
Check item Corrective action
Check whether any measures have been taken to reduce noise. To reduce noise, take measures such as the use of shielded cables for
connection.
Check item Corrective action
Check whether any measures have been taken to reduce noise. To reduce noise, take measures such as the use of shielded cables for
connection.