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Specifying Parameter Block Address, Message Enable Address, and Message Location
The dialog box shown in Figure 2-7 allows you to specify starting addresses for the
parameter block, the message enable flags, and the messages.
The TD 200 looks for a parameter block in the V memory of the CPU. The default location for
the parameter block is VB0. The default location can be changed. See Section 3.8 and
Section D.1 for information about placing the parameter block at other locations.
The starting byte for the message enable flags defines the location in V memory at which the
message enable flags begin. There are eight message enable flags stored in each byte.
Whole bytes must be allocated for message enable flags even if all the bits are not used.
The text in the dialog box shown in Figure 2-7 specifies how many bytes of V memory are
needed for message enable flags based on the number of messages you set in the previous
(Figure 2-6) dialog box.
The starting byte for message information defines the starting location of the first message in
V memory. Messages are placed consecutively in memory. Either 20 or 40 bytes are
reserved for each message based on your selection in the previous dialog box (Figure 2-6).
The text in the dialog box shown in Figure 2-7 specifies how many bytes are required for
messages.
Values for the parameter block, enable flags, and message information starting addresses
are CPU specific. See the SIMATIC S7-200 Programmable Controller System Manual for the
valid address ranges for specific CPUs.
For this example, set the parameter block starting byte to 0, the enable flags address to 12,
and the message information starting address to 40 as shown in Figure 2-7.
TD 200 Configuration Wizard
Figure 2-7
Wizard: Block Address, Enable Flags, and Message Location
SIMATIC TD 200 Operator Interface
C79000-G7076-C205-04
You must now define where you would like the 12 byte parameter definition
to reside in your data block. It is usually located at VB0.
Starting byte for 12 byte parameter block:
You have defined 3 messages requiring 1 consecutive bytes for message
enable flags. You must now define where you would like the enable flags to
reside in your data block.
Starting byte for enable flags:
You have defined 3 messages requiring 120 consecutive bytes for the
message information. You must now define where you would like the
message information to reside in your data block.
Starting byte for message information:
Configuring the TD 200
0
12
40
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