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D.4
Embedding Data Values in a Text Message
The TD 200 allows you to place data values within the message that you want to display.
You can display and edit these embedded values. Each embedded value must be preceded
by a format word which defines how the value is displayed and whether the message
requires acknowledgement.
Data Value Format Options
The format word in a message provides the following information:
How the value is displayed—signed or unsigned; word, double word, or real
(floating-point); and decimal position
Whether or not the message requires acknowledgement
Whether the optional data value is editable
Whether editing requires a password
You can use format words alone, with an optional word value, with an optional double word
value, or with an optional real (floating-point) value. The format word uses two bytes of your
message if it is not followed by a data value, four bytes of your message if the format word is
followed by a word value, and six bytes of your message if the format word is followed by a
double word value or a real (floating-point) value. Figure D-9 shows each type of format word
usage.
Format Word without an Optional Data Value
Byte 0
MSB of
Format
Format Word with an Optional Word Value
Byte 0
MSB of
Format
Format Word with an Optional Double Word Value or Real (Floating-Point) Value
Byte 0
MSB of
Format
Figure D-9 Format Word Usage
SIMATIC TD 200 Operator Interface
C79000-G7076-C205-04
NOTE: This allows you to configure a message for
Byte 1
acknowledgement (to be flashing), but to have no data
LSB of
to display.
Format
Byte 1
Byte 2
Byte 3
LSB of
MSB of
LSB of
Format
Word
Word
Byte 1
Byte 2
Byte 3
LSB of
MSB of
Format
DWord
TD 200 Parameters and Messages
Byte 4
Byte 5
LSB of
DWord
D-11
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