When An A/D Conversion Circuit Diagnostic Error Occurs; When It Takes Time For The Sil2 Analog Input System To Start Up - Mitsubishi Electric R60AD8-G User Manual

When an A/D conversion circuit diagnostic error occurs

Check item
Check whether the R60DA8-G for diagnostics operates normally.
Check whether the module parameters of the R60DA8-G for diagnostics are
set correctly.
Check whether the 24VDC external power supply is applied to the R60DA8-G
for diagnostics.
Check whether the RY40PT5B operates normally.
Check whether the module parameters of the RY40PT5B have been changed.
Check whether the 24VDC external power supply is applied to the
RY40PT5B.
Check whether there is any problem with analog signal lines for modules and
relay, such as looseness or disconnection.
Check whether any measures have been taken to reduce noise.
Check "Duplex input error range setting".
If operation is not performed normally even after the actions described above are taken, the possible cause is
a failure of a module in the module set. Please consult your local Mitsubishi representative.

When it takes time for the SIL2 analog input system to start up

Check item
Check whether the start-up diagnostics is being executed.
Corrective action
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 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 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 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)
If the module parameters of the RY40PT5B have been changed, reset them to
the default values.
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.
Identify the faulty area by a visual check and continuity check for analog signal
lines and relay of the channel where an error occurred.
To reduce noise, take measures such as the use of shielded cables for
connection.
The allowable error range for A/D conversion circuit diagnostics is
automatically set according to "Duplex input error range setting". If A/D
conversion circuit diagnostic errors occur frequently, adjust the setting of
"Duplex input error range setting" to allow the customer's system error range
including the effect of noise. For details, refer to the following.
Page 286 A/D conversion circuit diagnostic function
Corrective action
The start-up diagnostics is the function executed when a SIL2 analog input
system starts up, and takes a maximum of SIL2 A/D conversion cycle
(1000ms by default)  56. To reduce the start-up diagnostic time, adjust "SIL2
A/D conversion cycle setting".
To temporarily skip the start-up diagnostics when starting up the SIL2 analog
input system, set the safety operation mode of the SIL2 Process CPU to TEST
MODE.
For details on the start-up diagnostics, refer to the following.
Page 286 A/D conversion circuit diagnostic function
14.3 Troubleshooting by Symptom
14 TROUBLESHOOTING
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