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6 Maintenance and Troubleshooting
NB-series Programmable Terminals Startup Guide Manual(V109)
6-3 Troubleshooting
6
6-3-3 Hardware Troubles
8
Why is the speed of PT operation becoming slow after macro is executed
(a) When writing code of macro, if a large of number of address variables of the PLC or
slave Unit are defined, the execution speed of the PT may suffer. When executing a
macro program, the processor picks up the variable addresses defined first, executes
the macro, then carries out output. If the macro is executed at a high frequency, a large
amount of time is used to perform communication with the slave Unit, thus affecting the
execution speed of the PT as a whole.
(b) It is because the variable in macro code has used the PLC address. The user can
realize the communication and make the macro executed normally by setting the
special register LW9535 (time magnification during the communication by PLC
variables for macro with its default of 0) to extend the wait time. If the macro cannot
executed normally, it is recommended the user to set LW9535 to “2 or above”.
1
How to calibrate the system time of the PT
There are 2 methods to calibrate the time:
Method 1: there are 2 DIP switches on the backside of the PT. Tweak both of the DIP switches 1
and 2 to ON, reboot the PT, then the Setup Screen turns up, as shown below: (take NB5Q-
TW00B as an example)
Click the time component, input the current time.
Method 2: Create a new project, and place 7 Number Input components on the screen, with
each of the addresses LW10000~LW10006 respectively corresponding to the Second, Minute,
Hour, Day, Month, Year and Week The time can thus be calibrated through changing the values
of these 6 Number Input components.
2
The time cannot be saved or the display is not accurate
If the time cannot be saved, the most likely cause is that the battery runs low. When the PT is
disconnected from the power supply, the RTC needs to be energized by the battery on the PT
mainboard. When the battery voltage descends to an unsustainably low level, it may cause that
the time cannot be saved or the display is not accurate, therefore requiring the Unit to be sent
back to replace.
6-3-3 Hardware Troubles
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