Siemens SIMATIC TD 200, User Manual

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2-14
SIMATIC TD 200 Operator Interface
C79000-G7076-C272-01
This variable displays as a real number which requires a double word data format.
After you select “Double Word,” the Display Format area allows selection of a real
(floating point) number format. For real numbers, the field entitled Digits to the right
of the decimal defines the fixed decimal location of the real number in the TD 200
display. The TD 200 rounds a real number to the specified decimal place. For
example, if the real number value is 123.456 and you select 2 digits to the right of
the decimal, the TD 200 displays this value as 123.46.
In this example, this variable should be editable by the user. Select the check box
that allows the user to edit the data. Once the edit-allowed selection has been
made, two new fields appear in the Embedded Data dialog box.
The Edit Notification Bit field specifies the location of a bit which the TD 200 sets to
1 whenever the data value is edited and written to the CPU. The CPU program
uses the edit-notification bit to recognize when an editable data value has been
changed. The program can then read and make use of the edited value. The user
program is responsible for resetting this bit to 0.
The password-protected check box asks you if you wish to require a password for
editing this data value. If checked, the operator must enter a password before
being allowed to edit the data value. You selected the password at the beginning of
the configuration process (see Figure 2-3); it is shown in the Password for Edit
field.
After you have made the selections shown in Figure 2-12, click “OK” to continue
the configuration for this example.
Embedded Data
Cancel OK Delete
None
Word
Double Word
Signed
Unsigned
1
Digits to the right of the
decimal
User must acknowledge message
User is allowed to edit this data.
VD116 Address of Data Value:
V114.2 Edit Notification Bit:
Should the user edit of data be Password-protected?
1111
Password for Edit:
Real (floating point)
Note: These fields
appear only when
certain options are
chosen.
Data Format: Display Format:
Figure 2-12 Embedded Data: Making the Data Editable and Password Protected.
Configuring the TD 200