Omron NT20, User Manual

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Numeral Setting Section 4-8
If a sign is displayed when using the thumbwheel type of numeral set-
ting, the maximum number of digits for both positive and negative num-
bers is 7.
• Decimal Point
A maximum of 7 digits can be input after the decimal point (or 6 for
negative numbers).
• Hexadecimal Input
When the display attribute is set for hexadecimal display, values are input
in the hexadecimal format.
• Numerical Value Range
Numerical values can be input in the range 0 to FFFFFFFF (8 digits).
• Attributes That Can Be Set
The attributes of the numerical values displayed in the input field are the
same as for numeral displays. Refer to
Numerals Which Can Be Displayed
on page 145.
Upper/Lower Limit Check
When direct connection is used with an NT20, upper and lower limits can be
set for input numerical values to prevent erroneous values that are outside the
valid range being stored in the numeral memory table or sent to the PLC.
The upper/lower limit check is executed when the input numerical value has
been confirmed: if the value is outside the valid range, the screen returns to its
status before input.
Note In order to use the numerical value input setting safely, always use the upper/
lower limit check function. (This function is not supported by the NT20-ST128.
Take appropriate measures using the user application software.)
4-8-2 Types of Numeral Setting
There are two types of numeral setting: the numeric key type, and the thumb-
wheel type. The basic function of these two types is the same, but the screen
displays and input methods are different.
A maximum of 50 input fields, including both numeric key and thumbwheel
types, can be registered on one screen.
Numeric Key Type
When a numerical value is input using touch switches to which numeric key functions have been allocated, the
input numerical value is displayed on the screen. On pressing the return key after completing input, the input
numerical value is written to the numeral memory table and sent to the host.
If there is more than one numeral setting input field, the field in which the input is to be made can also be se-
lected with the numeric keys.
In order to perform numeric key input, it is necessary not only to create a numeral setting input field on the
screen, but also to create the numeric keys to be used for input. (Refer to 4-8-4 Using Numeric Keys ).
Displayed in the numeral
setting input field
Input
Input the numerical value using the
numeric keys on the screen.
Write
Notification
Numeral
memory table
On pressing the key, the input value is written to the
numeral memory table and the PLC will be notified simultaneously.
1 2 3 4 1 2 3 4 Host
NT20