Mitsubishi Electric MELSEC iQ-R Series User Manual page 59

Other troubleshooting
For other troubleshooting, check the following items.
Situation
The auto configuration is not executed.
The target parameter cannot be
acquired with the auto configuration.
Parameter save/clear to flash ROM
does not start.
The parameter is not saved in the Flash
ROM.
After the power-on, the I/O
communication automatically starts.
At the execution of the data consistency
dedicated instruction, the data is not
transferred to the specified device/buffer
memory.
At the execution of the data consistency
dedicated instruction, the data is
transferred or not transferred to the
specified device/buffer memory.
At the execution of the data consistency
dedicated instruction, the data is
transferred to the unexpected device/
buffer memory.
An error occurs in the CPU at the
execution of the data consistency
dedicated instruction.
Check item
Is the following output signal on?
• 'I/O communication request' (Y11)
• 'Request for saving/clearing parameters to Flash
ROM' (Y17)
Is 'Auto communication start setting' (Un\G1585) set to
"Start"? ('I/O communicating' (X01) is on)
• Is the power of the slave node on?
• Is the power of the network on?
• Is the wiring correct?
When the target slave node is the RJ71DN91, is 'Auto
communication start setting' (Un\G1585) set to "Start",
or is 'I/O communication request' (Y11) on?
Is the slave node to assign set in order of node
address?
Is the connection type, number of I/O points correct?
Is the following output signal on?
• 'I/O communication request' (Y11)
• 'Auto configuration request' (Y15)
• Is 'Auto communication start setting' (Un\G1585) set
to "Start"? ('I/O communicating' (X01) is on)
Is the parameter save area correct?
Is 'Auto communication start setting' (Un\G1585) set to
"Start"? ('I/O communicating' (X01) is on)
Does the I/O communication start?
Is the mode correct?
Is the data consistency dedicated instruction supporting
the mode used?
Is the data consistency dedicated instruction validity
setting error (20FEH, 21FEH) for the master function or
slave function stored in 'Master function error
information' (Un\G433) or 'Slave function error
information' (Un\G1537)?
Is the same data consistency dedicated instruction
executed many times for a single sequence scan?
Are device/buffer memory set in the argument of the
data consistency dedicated instruction correct?
Is the name of the data consistency dedicated
instruction correct?
Is the argument of the data consistency dedicated
instruction correct?
Action
Turn off the output signal on the left column, and turn off
and on 'Auto configuration request' (Y15) again.
• Set 'Auto communication start setting' (Un\G1585) to
"No Start".
• When 'I/O communication signal request' (Y11) is
turned on and off, the I/O communication stops and 'I/
O communicating' (X01) turns off.
Check if the power of slave node and network power are
on, and the wiring is correct.
When the auto communication start setting is not set to
the target slave node (RJ71DN91), turn off and on 'I/O
communication request' (Y11).
The setting of the slave node detected by the auto
configuration is stored in order of node address.
Set the correct value to the corresponding item of
'Master function parameters' (Un\G468 to Un\G975).
Check the available connection type and number of I/O
points referring to the manual for each slave node.
Set the correct value to the corresponding item of
'Master function parameters' (Un\G468 to Un\G975).
Turn off the output signal on the left column, and turn off
and on 'Request for saving/clearing parameters to Flash
ROM' (Y17) again.
• Set 'Auto communication start setting' (Un\G1585) to
"No Start".
• When 'I/O communication signal request' (Y11) is
turned on and off, the I/O communication stops and 'I/
O communicating' (X01) turns off.
After checking 'Parameter save/clear selection bit'
(Un\G1584), turn off and on 'Request for saving/clearing
parameters to Flash ROM' (Y17) again.
• Set 'Auto communication start setting' (Un\G1585) to
"No Start".
• When 'I/O communication signal request' (Y11) turns
on and off, the I/O communication stops and 'I/O
communicating' (X01) turns off.
• Start the I/O communication. (Turn on 'I/O
communication request' (Y11))
• Set the mode switch setting correctly.
• Use the data consistency dedicated instruction
supporting the mode.
• Set the data consistency setting so that it supports the
master/slave, and turn on 'I/O communication request'
(Y11) again.
• Execute the one data consistency dedicated
instruction once in a single sequence scan.
• Set the correct device/buffer memory in the argument
of the data consistency dedicated instruction.
• Execute the data consistency dedicated instruction
with its correct name.
• Set the correct value to the argument of the data
consistency dedicated instruction.
4 TROUBLESHOOTING
4.5 Troubleshooting by Symptom
4
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