6-27
6 Maintenance and Troubleshooting
NB-series Programmable Terminals Startup Guide Manual(V109)
6-3 Troubleshooting
6
6-3-2 Communication-related Troubles
(j) Too many windows pop up, such as direct windows and indirect windows;
(k) There are too many controllers communicating with the HMI and too many
communication addresses.
Solutions:
(a) Components on a single screen communicating with the slave Unit should be as few as
possible;
(b) Try to keep the addresses of the components on a single screen communicating with
the slave Unit continuous;
(c) Try to use HMI’s internal addresses for variables in a macro program. If there is a need
for exchanging data between the touch panel and slave Unit communication
components, resort to the data transmission function of the timer or data transmission
components;
(d) Keep a minimum of number of channels of background components such as Trend
Curve, XY plot and historical data display components, etc. and make sampling
periods as long as possible;
(e) Try to keep Warning and Event Information Registration addresses continuous;
(f) Do not use too many PLC control components;
(g) Use a shielded cable for the communication cable. Keep it at least 10 CM away from
power lines, and make sure the system is grounded properly;
(h) Try to use tag fonts when programming. Try to use less vector fonts, and when using
vector fonts, keep font formats as few as possible.
4
PLC No Response: what is the meaning of XX-XX-X
XX-XX-X means: HMI number - PLC station number - HMI serial port number. For example, 00-
01-01 means the No.0 HMI using the serial port COM1 loses communication connection to the
controller with the station number 1.
The serial port number is defined as: 01/02 represent COM1/COM2.
5
The causes for a project downloading failure
Downloading through USB fails:
Check whether hardware connections are still functioning well or not, then check through the
following factors
(a) USB driver is not installed successfully.
(b) USB driver has been damaged. Find the driver at NB-Designer/driver and reinstall it;
(c) The USB downloading cable has been damaged, so replace it;
(d) The USB port of the HMI or the PC fails;
(e) Electromagnetic interference is affecting the USB downloading cable. Make sure the
system is grounded properly.
Downloading in the serial mode fails:
(a) [Tool] menu Æ [Downloading Mode Options]Æ Whether [Serial] is selected.
(b) Whether the serial No. of the PC is correct;
(c) The serial port is occupied or problems arise to the PC serial port;
(d) The fabrication of the communication cable is incorrect or the bonding wire falls off;
(e) The downloading cable is plugged incorrectly, and it should be plugged to the COM1
port with the label indicating the NB Unit;
(f) The serial port of the HMI fails (The serial port does not support hot plug, so take care
and avoid man-made damage).
Downloading in the network interface mode fails:
(a) [Tools] menu -> [Download Way] -> Whether [Network Interface] is selected.
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