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The default location of the parameter block is VW0, but you can store the parameter block
(or the offset to the parameter block) in any V memory location between VW0 and VW999.
(Use the Setup menu to change the location of the parameter block. See Section 3.8.) If you
change the location of the parameter block, the TD 200 looks to that location for either the
parameter block or the offset to the parameter block.
If the parameter block identifier cannot be found, the error message NO PARAMETER BLOCK
is displayed. The TD 200 continues to monitor VW0 (or the V memory location entered by
means of the Setup menu) for either a valid parameter block ID or an offset to a parameter
block with a valid parameter block ID.
Note
The TD 200 defaults to address 1 and attempts to communicate to a CPU at address 2.
See Section 3.8 to change the network addresses if other addresses are used.
Description of the Parameter Block Format
The parameter block consists of 10 or 12 bytes of memory which define the modes of
operation and point to the location in CPU memory where the actual messages are stored,
as shown in Figure D-2. When you power up the TD 200, it looks for a parameter block
identifier in the CPU at VW0, either the ASCII characters "TD" or an offset to the parameter
block location, and it reads the data contained in the block.
Byte 0 Byte 1 Byte 2 Byte 3 Byte 4 Byte 5 Byte 6 Byte 7 Byte 8 Byte 9
Parameter
Block ID
"T"
"D"
7 6 5 4 3 2 1 0
A L L L U U U U
Language
Select Standard or
Alternate (Bar Graph)
character set
Figure D-2 TD 200 Parameter Block
SIMATIC TD 200 Operator Interface
C79000-G7076-C205-04
CPU Memory
TD 200
No. of
M Area
Configuration
Msgs.
Address
7 6 5 4 3 2 1 0
0 P C F
Display
Update Rate
Disable/Enable Time-of-Day Clock Menu
Disable/Enable Edit Password.
Note: If enabled, password is stored in bytes 10 and 11
of extended parameter block.
TD 200 Parameters and Messages
Byte 10 Byte 11
Message
Message
Password
Enable
Address
Address
Points to messages
D
Display Mode:
20 or 40 characters per message
Disable/Enable Force Function
(optional)
D-3
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