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78
Standard Mode
Section 4-6
4.6.1.1.4
‘BCD-Number’ Variable Type
The BCD format is partially used to represent numbers in the PLC. This output is
required in special cases. The positional significance of the displayed digits in-
creases from right to left. The numbers 0 to 9 are used for the representation;
leading zeros can be included optionally. The BCD mode of representation is suit-
able for the data types Byte, Word and Lword. The length is limited to a maximum of
8 digits. There are no blanks between the characters. The variable value is stored
in the controller in BCD format. The range of numbers for a byte is 00 to 99.
10
4
10
3
10
2
10
1
10
0
Positional significance
0
1
2
3
4
Display (1234
D
)
4.6.1.2
‘Alphanumerical’ Representation
In the alphanumerical mode of representation, ASCII strings are read from the
controller in byte format and are represented on the display. The number of charac-
ters which can be displayed depends on the capabilities of the type of terminal
involved. One display line is the maximum permissible length for a variable; longer
texts are truncated. The address in the variable list indicates the beginning of the
character string. A definition of the variable size is not included and is not neces-
sary. The alphanumerical representation provides another means of editing mask
texts during runtime.
4.6.1.3
‘Selection Text’ Representation
In the Selection Text mode of representation, a text string is assigned to a numer-
ical value.
This allows two different tasks to be performed:
1. visualization or selection of statuses by means of text strings
2. change of mask.
An example of using a one-line selection text is the option of selecting the parity for
a serial interface.
In this case, the text list will contain three entries:
Value
Text
0
No Parity
1
Odd
2
Even
A variable (ComParityA / ComParityB) is created in the mask.
Only these three options are selectable on the operating terminal by means of the
Standard or Mix-Mode Editor; invalid inputs are therefore prevented.
Summary of Contents for NT15S
Page 1: ...Cat No V056 E1 1 Programmable Terminal NT4S NT15S NT18S OPERATION MANUAL ...
Page 2: ...ii ...
Page 3: ...iii NT4S NT15S NT18S Programmable Terminal Operation Manual Produced March 1999 ...
Page 4: ...iv ...
Page 6: ...vi ...
Page 14: ...xiv ...
Page 26: ...12 The Terminals of the NT Series Section 1 2 1 2 4 1 2 NT4S SF122B E 1 2 4 1 3 NT4S SF123B E ...
Page 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 ...
Page 54: ...40 The Terminals of the NT Series Section 1 7 1 7 6 3 ASCII Character Set Table ...
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