Section 3 Using PTs 3-6 Inputting Numeral and Character Strings
3-19
NS Series Programming Manual
Inputting to Thumbwheel Switches
Thumbwheel switches are used to input numerals by using the + and – Buttons for each digit.
The value for that digit will increase or decrease by 1 each time the + or – Button is pressed. The
changed value will be stored to the specified address each time the + or – Buttons are pressed. Unlike
numeral display and input objects, there is no button operation required to confirm the input.
Changing Signs
If thumbwheel switches have signed display, the sign is changed each time the + or – Button of the
digit displaying the sign is pressed.
Inputting Decimals
To input decimals, it is necessary to use CX-Designer to set the unit and scale and the number of
decimal digits to be input. Refer to Unit and Scale in 2-8 Common Functional Object Functions for in-
formation on setting units and scales.
N
N
N
o
o
o
t
t
t
e
e
e
♦
Decimals can be input only when the display format is decimal.
♦
The scale for a thumbwheel switch must be set to a power of 10, and the offset must be set to 0. If
any other values are set, the thumbwheel switch many not operate properly.
Maximum and Minimum Limits for Input
NS-series PTs can check maximum and minimum limits when numerals are input (each time the + or –
Button is pressed), to ensure that illegal values that may affect the system are not input. Errors are
prevented because an error message is displayed if a value outside the range is input. The maximum
and minimum input limits can be set when thumbwheel switches are created using CX-Designer.
Refer to Thumbwheel Switches in 2-12 Display and Input Objects for details on Thumbwheel Switches
setting.
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