6-31
6 Maintenance and Troubleshooting
NB-series Programmable Terminals Startup Guide Manual(V109)
6-3 Troubleshooting
6
6-3-4 Errors occurred when the UDP communications with OMRON PLC
6
PT white screen and flickering screen
The causes of a white screen or a flickering screen: the ambient temperature exceeds the
range specified on the PT nameplate, or the liquid crystal is damaged.
Solutions: Check the ambient temperature and compare it with that specified on the PT, or
please contact the supplier printed on the back cover.
7
The serial port gets heated when the PT communicates with other devices
Check the grounding of the PT and other communication devices. If the grounding is not
shared, there is a possible significant voltage difference between the devices, leading to a
heavy current, thus causing a heated serial port.
8
The PT doesn’t startup normally
The kernel or Roofts may be corrupted due to any reasons.
Rewrite the kernel and Roofts. (Refer to 4-4 System Process in NB- Series Programmable
Terminals Operation Manual (V106) for details on the rewriting method.)
1
What consequences will occur if the same IP address is used for two PLCs
The user should avoid such kind of setting. If it occurs, NB may receive the information from
one PLC at a moment while receive the information from the other PLC at the next moment.
2
What consequences will occur if the same Node ID is used for two PLCs
The user should avoid such kind of setting.
If two PLCs have the same Node ID but different IP address, NB can only connect with the one
that is set in the NB-Designer.
If two PLCs have the same Node ID and IP address, NB may receive the information from one
PLC at a moment while receive the information from the other PLC at the next moment.
3
What will happen if the NB is connected with PLCs more than 32 units
No errors occur in NB, but the NB does not respond to the PLC which is not set for NB.
1
During Direct Online Test, the internal data of the PLC is readable, but not alterable
Check whether the internal storage addresses of the PLC is writable or not. If the address is
read only, the storage data cannot be changed. then check whether the communication cable is
normal or not.
6-3-4 Errors occurred when the UDP communications with OMRON
PLC
6-3-5 Other Troubles
To Next Page
Loading...
Need help?
General
