Download Operating the TD 200

TD 200 Parameters and Messages
D.3
Formatting Messages
Messages can contain multiple text fields, format words, and variables. The
TD 200 allows two message sizes.
20-character message mode - displays two messages at a time
40-character message mode - displays one message at a time
Once you choose a message size, all messages must correspond to that size. The
size is selected on a system basis in the parameter block, and not on a
per-message basis. The TD 200 uses the setting of the message size to index the
messages stored in the S7-200 CPU V memory.
In applications where alarm or fault conditions can occur and notification is
essential, you can configure the TD 200 to display multiple messages.
The Chinese character set requires 2 bytes to describe each Chinese character.
When you use the Chinese character set, the messages are still 20 or 40 bytes
long, but will display 10 or 20 Chinese character respectively. ASCII and Chinese
characters can be mixed within a message. Chinese characters placed in the last
byte of the message, or those that split lines in a 40 character message will be
displayed as blank spaces.
This section shows you how to create a 20- or 40-character message.
Note
A message cannot have more than six variables. Additional variables are ignored
and the variable positions in the display remain blank.
Twenty-Character Message Format
The 20-character message format requires 20 bytes of V memory storage in the
S7-200 CPU for each message. Each message is displayed on one line of the
TD 200 display, allowing two messages to be shown at the same time. Figure D-7
shows an example of how a 20-character message can be formatted in the CPU
and displayed on the TD 200.
How the Message Looks in V Memory
P
R
E
S
S
U
R
E
Text 1
f
f
Format
Word
Value
P
S
I
Text 2
Variable
Data (word)
How the Message Is Displayed on the TD 200
P
R
E
S
S
U
R
E
1
2
3
4
P
S
I
Figure D-7 Twenty-Character Message Format
D-10
SIMATIC TD 200 Operator Interface
C79000-G7076-C272-01