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H
ow are screens displayed?
Each screen has a unique number. The NT2S B scans a user definable register called as Screen
Triggering Register (STR) in the PLC. To display screen number "XXX", simply put the number
"XXX" in this STR. Valid screen numbers are 1 to 65528.
Normal screens are used to monitor status or alarms. A screen can have register values or bit
controlled text embedded in it which is dynamically updated. Special screens are used to change
data in the PLC or to turn a coil ON or OFF.
Link screen defines a list of screens that can be viewed consecutively by pressing the NEXT or
PREV keys.
W
hat are screen attributes?
A normal screen can flash or scroll on the display. Any screen can be assigned to be sent to a
serial printer. A screen can be assigned only to the top line, bottom line or both lines. A
minimum time can be assigned to ensure that the operator has enough time to view the screen.
If the PLC calls other screens in this time, they will be stored on a queue inside the unit.
The maximum queue size is 3 screens.
Note: The queue can be cleared by putting the number 65535 in STR. You can likewise call a
screen on priority by putting the number 65535 in STR first and then calling the desired screen
number.
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