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TD 200 Parameters and Messages
Password Protection Bit 3
Setting bit 3 in byte 0 of the format word (see Figure D-16) enables you to require that a
password be entered before allowing a variable to be edited from the TD 200. This password
(a four-digit integer from 0000 to 9999) is stored in bytes 10 and 11 of the parameter block.
MSB
7 6
0
Figure D-16 Password Protection Bit of Byte 0 of the Format Word
Edit-Allowed Bit 4
Figure D-17 shows the edit-allowed bit that is used by the TD 200 to determine whether or
not you can edit a data value. If the edit-allowed bit is set, the TD 200 sets the
edit-notification bit (bit 2 in byte 0 of the format word) after you have edited the data value.
MSB
7 6
0
Figure D-17 Edit-Allowed Bit of Byte 0 of the Format Word
D-16
Format Word
Byte 0
Byte 1
Byte 2
MSB of
LSB of
MSB of
Format
Format
Data
LSB
5
4
3
2
1
0
P – Password Protection
0
E P EN
AN
A
0 – Password not enabled
1 – Password enabled
Format Word
Byte 0
Byte 1
Byte 2
MSB of
LSB of
MSB of
Format
Format
Data
LSB
E – Edit-Allowed
5
4
3
2
1
0
0 – Edit not allowed
0
E P EN
AN
A
1 – Edit allowed
Optional Data Value
Byte 3
Byte 4
Byte 5
LSB of
Data
Optional Data Value
Byte 3
Byte 4
Byte 5
LSB of
Data
SIMATIC TD 200 Operator Interface
C79000-G7076-C205-04
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