6 Maintenance and Troubleshooting
6-32
NB-series Programmable Terminals Startup Guide Manual(V109)
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 error will occur in NB, but NB will not respond to the PLC which is not set because NB only
supports the FINS client protocol.
1
During Direct Online Simulation, 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
property is Read only, the data cannot be changed; then check whether the communication
cable is normal or not.
2
What is the difference between the USB Host and Slave ports
USB Slave port is used for downloading/uploading data, executing functions related to the NB-
Designer and connecting printers using pictBridge protocol, and not for communicating with the
slave Units. USB Host port can be connected with a USB flash disk to perform the uploading,
downloading, project operation and storage of related data. According to the appearance, the
Slave port is customarily called [Square port], while like the USB port on a PC, the Host port is
customarily called [Flat port]. The USB Slave port is as shown below:
3
What influences do on-site interferences have on the PT, and what are the countermeasures
On an industrial site, various kinds of interferences will be encountered inevitably. Interferences
may cause the following troubles for the touch panel.
(a) A small information window displaying “PLC NO RESPONSE” appears intermittently;
(b) Communications with the PT breaks off, whenever an inverter, motor, transformer or
some other equipment alike starts;
(c) The PT crashes;
(d) The touch-control of the PT becomes insensitive.
6-3-4 Problems about FINS/UDP
6-3-5 Other Troubles
Slave Port
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