Mitsubishi Electric MELSEC iQ-R Series User Manual page 51

When the NS LED is flashing in red
When the NS LED is flashing in red, check the following.
Check item
Does any error occur in the communication with the slave node?
When the NS LED turns on in red
When the NS LED turns on in red, check the following.
Check item
• Are there the same node addresses on the network?
• Is every communication speed on the entire network same?
• Is the terminating resistor connected to both ends of the trunk line?
When the NS LED is flashing in green
When the NS LED is flashing in green, check the following.
Check item
Is the I/O communication performed?
When the MS LED is flashing in green
When the MS LED is flashing in green, check the following.
Check item
Is the parameter correct?
When the MS LED turns on in red
When the MS LED turns on in red, check the following.
Check item
What is the mode switch set to?
When the MS LED is flashing in red
When the MS LED is flashing in red, check the following.
Check item
Is everything proper excluding the hardware and parameters?
Action
An I/O communication error occurs on communications with one or more slave
nodes.
Check the error code with the following buffer memory, and take proper action.
• 'Master function error information' (Un\G433), 'Master function communication
error information' (Un\G1152), or 'Other slave communication error information'
(Un\G1154 to Un\G1217)
• 'Slave function error information' (Un\G1537) or 'Slave function communication
error information' (Un\G1153)
Action
Check the items on the left and error codes.
If the items are normal, check the status of the network, such as the noise and
installation, comprehensively.
Action
Turn on 'I/O communication request' (Y11).
Action
A parameter error occurs. Check the following and take proper action.
• Is the mode switch set to 0 to C?
• Is the node address set to 0 to 63?
• 'Master function error information' (Un\G433), 'Master function communication
error information' (Un\G1152), or 'Other slave communication error information'
(Un\G1154 to Un\G1217)
• 'Slave function error information' (Un\G1537) or 'Slave function communication
error information' (Un\G1153)
Action
A hardware failure occurs.
• When the mode switch is 0 to 8 or A to C, check the error code.
• When the mode switch is 9, the hardware test is completed with an error. Check
'Hardware test result area' (Un\G1583) of the buffer memory.
Action
A module failure occurs. (Hardware failures and parameter errors are excluded.)
Check the error code.
4 TROUBLESHOOTING
4.1 Checking with LEDs
4
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