Siemens SIMATIC TD 200, User Manual

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D-12
SIMATIC TD 200 Operator Interface
C79000-G7076-C272-01
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.
Byte 0 Byte 1
MSB of
Format
LSB of
Format
Byte 0 Byte 1
MSB of
Format
LSB of
Format
Byte 2 Byte 3
MSB of
Word
LSB of
Word
Byte 0 Byte 1
MSB of
Format
LSB of
Format
Byte 2 Byte 3
MSB of
DWord
Byte 4 Byte 5
LSB of
DWord
Format Word without an Optional Data Value
Format Word with an Optional Word Value
Format Word with an Optional Double Word Value or Real (Floating-Point) Value
NOTE: This allows you to configure a message for
acknowledgement (to be flashing), but to have no data
to display.
Figure D-9 Format Word Usage
TD 200 Parameters and Messages