9. TROUBLESHOOTING
IMR01Y09-E3
90
Continued from the previous page.
Problem Probable
cause
Solution
•
NS (or NET) lamp
flashes (Green)
•
MS (or MOD) lamp
ON (Green)
DeviceNet communication
Communication have not yet been
established
It is checked whether or not the
COM-JH is registered to the master as
a slave.
Re-start after checking the following
items.
•
Does the speed coincide with the
master communication speed ?
•
Is not the DeviceNet communication
cable connected yet, incorrectly
connected or removed ?
•
Is the length of the DeviceNet
communication cable appropriate ?
•
Are termination resistors (121
Ω
)
connected only to both ends of the
trunk line ?
•
Does much noise exist ?