When The Bits Corresponding To 'Hart Scan List' (Un\G2076) Are Not Turned On; When The Hart Communication Error Occurs; When A Timeout Error Occurs On M_Commdtm-Hart; When The Status Change Of Device Dtm To Offline Fails - Mitsubishi Electric Melsec iQ-R Series User Manual

When the bits corresponding to 'HART scan list' (Un\G2076) are
not turned on
Check item
Check whether the bit of 'HART communication enable/disable setting'
(Un\G2074) of the target channel is set to Enable (1).
Check whether the external power supply of 24VDC supplied to the A/D
converter module operates properly.
Check whether wiring for the HART-enabled device is performed correctly.
Check whether wiring for the external power supply of 24VDC is not affected
by a noise.
Check whether the polling address of the HART-enabled device is set to 0.

When the HART communication error occurs

Check item
Check whether wiring for the HART-enabled device is performed correctly.
Check whether wiring for the external power supply of 24VDC is not affected
by a noise.
Check whether the external power supply of 24VDC is supplied within the
specified range.

When a timeout error occurs on M_CommDTM-HART

Check item
Check whether "Request timeout" is set appropriately for the system in use.

When the status change of Device DTM to offline fails

Check item
Check whether the status change of Device DTM to offline has been
performed immediately after the execution of its status change to online using
FDT frame application.
Action
Check 'HART communication enable/disable setting' (Un\G2074) using the
monitor functions of the engineering tool ("Device/Buffer Memory Batch
Monitor" or "Intelligent Function Module Monitor"). When the bit of the target
channel is set to Disable (0), change it to Enable (1) with the engineering tool
or a program.
Check 'External power supply READY flag' (X7). If the flag is off, supply the
external power supply of 24VDC to the +24V terminal and the 24G terminal.
Check the wiring between the A/D converter module and the HART-enabled
device by referring to the manual below.
•  MELSEC iQ-R HART-Enabled Analog-Digital Converter Module User's
Manual (Startup)
•  Manual of the used HART-enabled device
If a noise is included in the output of the external power supply of 24VDC, the
noise may be induced to the power supplied to the HART-enabled device. In
this case, install a noise filter on the wiring between the external power supply
and the A/D converter module.
Set the polling address to 0 using Device DTM of the used HART-enabled
device.
Action
Check the wiring between the A/D converter module and the HART-enabled
device by referring to the manual below.
•  MELSEC iQ-R HART-Enabled Analog-Digital Converter Module User's
Manual (Startup)
•  Manual of the used HART-enabled device
If a noise is included in the output of the external power supply of 24VDC, the
noise may be induced to the power supplied to the HART-enabled device. In
this case, install a noise filter on the wiring between the external power supply
and the A/D converter module.
Check that 24VDC is supplied between the A/D converter module and the
HART-enabled device within the specified range by referring to the manual
below.
•  MELSEC iQ-R HART-Enabled Analog-Digital Converter Module User's
Manual (Startup)
•  Manual of the used HART-enabled device
Action
Set an appropriate value in "Request timeout" according to the specifications
of the connected HART-enabled device and the communication path between
the HART-enabled device and the personal computer.
Page 71 Timeout Settings
Action
After the execution of status change of Device DTM to online, take a few
seconds and then perform the status change of Device DTM to offline.
If the change to offline fails again, take a longer interval and then perform the
processing once again. It may take a minute or longer for a certain HART-
enabled device to complete the processing successfully.
4.3 Troubleshooting by Symptom
4 TROUBLESHOOTING
4
79