Siemens SIMATIC TD 200, Руководство пользователя

Страница: 34 / 132

2-12
SIMATIC TD 200 Operator Interface
C79000-G7076-C272-01
Formatting the Embedded Data Value
Figure 2-10 shows the Embedded Data dialog box. This dialog box allows you to
specify the data type, format, and display characteristics of an embedded data
value. You can also select whether or not the message requires acknowledgement,
whether the data value can be edited, and whether or not editing requires a
password. Some options depend on the selections you make and do not appear
when the dialog box opens.
The data format selection defines the size of the data value embedded in the
message:
Select “None” when a message requires acknowledgement but there is no
embedded data value to be displayed on the TD 200.
Select “Word“ when the embedded data value is an integer. A word or integer
value requires the space of two characters within your message to hold the
data value.
Select “Double Word” when the embedded data value is a double word or a real
(floating point) value. A double word or real value requires the space of four
characters within your message to hold the data value.
The display format selection tells the TD 200 whether the data value is signed or
unsigned. The TD 200 uses this information when editing the data value. Signed
values may be either positive or negative numbers. Unsigned values are restricted
to positive numbers.
The selection for digits to the right of the decimal provides scaling for the display of
the data value. If the data value is an integer, this selection allows you to scale the
integer value for display by specifying the location of the decimal point. For
example, if the data value is equal to 123 and you select 1 digit to the right of the
decimal, the TD 200 displays 12.3.
The Embedded Data dialog box contains a check box to require acknowledgement
of the message. If a message requires acknowledgement, it flashes on the TD 200
display until the operator presses ENTER. The dialog box also contains a check
box for allowing editing of the data value. If this box is selected, the operator can
edit the embedded data value. If the box is not checked, the data cannot be edited.
The Embedded Data dialog box also lists the address of the data value within the
message. The user program uses this address to write the data value in the
message.
Configuring the TD 200