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73
Standard Mode
Section 4-6
4.6.1
Output Variables
Output variables are numerical or alphanumerical data stored in the memory of the
connected controller. The variables are retrieved from the controller whenever re-
quired, and output on the display at the programmed location according to the
defined method of representation, formatting and scaling. Generally, a distinction
is made between displaying one-time variables (variables are transferred only
once and are then displayed) or at cyclic intervals (variables are continually up-
dated while displayed). The character attributes that are available depend on the
display type of the operating terminal.
One-Time Output Variables or Cyclic Output Variables:
Pure output variables are transmitted by the controller only once and are displayed
in the mask. This method offloads the communication process and is suitable for all
variables such as setpoint values, constant values and parameters that change
either rarely or never. All output variables can be displayed on a scaled and format-
ted basis.
Cyclic output variables are used to display actual values, in other words values
which vary continually while a mask is displayed. The cycle time (and thus the
intervals at which the displayed actual values are refreshed) corresponds to the
polling time predefined by the user.
Data transfer between the operating terminal and the PLC can be offloaded
by using variables of the same data type only (data word, flag word, input
word, flag word) and by using continuous addresses within one mask.
Cyclic output variables can also be scaled and formatted. Note that the display of
floating point numbers requires more computing time when the values are scaled.
These will therefore not be displayed in ‘real time’. For this reason, the cycle times
selected here should be
.
500 ms.
Also note that the larger the amount of cyclic data for transfer, the longer the re-
sponse time to new values from the PLC. As a result, longer polling times are re-
quired.
Formatted Output:
Formatting a numerical variable allows the display format of the variable to be
adapted to the output range of values. Formatting includes the number of digits to
be displayed, the number of post-decimal places (fractional digits) and whether
signs are to be used or not. The number of post-decimal places gives the operator
the impression that a division has been performed. A division is not actually carried
out, however. The variable in the controller must be available in the appropriate
(higher) resolution.
Example:
Actual value of a length in the controller:
Word variable
Range of values 0 to 65535
Resolution 1/100 mm
Display of actual values on the operating terminal:
Display range
0.00 to 655.35 mm
Содержание NT15S
Страница 1: ...Cat No V056 E1 1 Programmable Terminal NT4S NT15S NT18S OPERATION MANUAL ...
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Страница 3: ...iii NT4S NT15S NT18S Programmable Terminal Operation Manual Produced March 1999 ...
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Страница 37: ...23 The Terminals of the NT Series Section 1 4 1 4 1 3 NT4S SF123B E 1 4 1 4 NT15S SF121B E ...
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Страница 232: ...Authorized Distributor Cat No V056 E1 1 Note Specifications subject to change without notice Printed in the Netherlands ...