6 Maintenance and Troubleshooting
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NB-series Programmable Terminals Startup Guide Manual(V109)
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 slow to respond.
The interference issue is a rather complicated one, and the commonly used methods for
handling this issue include:
(a) Anti-strong-electricity-interference - Keep weak electricity cables such as
communication cables, signal cables and control cables away from strong electricity,
and do not lay them parallel with strong electricity cables. If possible, wire them through
iron tubes, and if the cable duct is multilayered, lay the weak electricity cables below
the strong electricity ones.
(b) Anti-inner-cabinet-interference - It’s recommended that the alternating current cables
and the direct current cables be laid in separate channels, and if laid in the same
channel, the weak electricity cables and the strong electricity ones need to be bundled
separately, and be kept as far away as possible.
(c) Anti-inverter-interference - Connect a filter to the power-supply side of the inverter, and
shroud it with a metal casing.
(d) Every equipment needs to be grounded properly.
(e) Use a separate switching power supply for the PT.
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