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Byte 0
Byte 1
Byte 2
Byte 3
Byte 4
Byte 5
Byte 6
Byte 7
Byte 8
Byte 9
Figure D-5 Message-Enable Bits for up to 80 Messages
M Area Address Byte 5
You must reserve eight internal memory bits (M bits) for the TD 200 to use when a
function key is pressed. Your program can inspect these bits and take the
appropriate action when a key is pressed. One M bit is set by the TD 200 each
time the corresponding function key is pressed.
Note
The TD 200 does not automatically reset the function key M bits after they are set.
If you use these bits within your program, you must then reset them from within
your program.
Byte 5 of the TD 200 parameter block defines the address of the byte of M bits.
Valid address values for specific CPUs are defined in the SIMATIC S7-200
Programmable Controller System Manual .
Figure D-6 shows a referenced byte (MBn) and shows which bit of the byte is set
by each function key.
Warning
!
The TD 200 sets an M bit each time a function key is pressed. If you do not intend
to use function keys, and therefore do not assign an M byte address for function
keys, the TD 200 defaults to byte M0 for the function keys. If your program uses
bits in M0, and a user presses any function key, the TD 200 sets the
corresponding bit in M0, overwriting the value assigned to that bit by your
program.
Inadvertent changes to M bits could cause your program to behave unexpectedly.
Unpredictable controller operation could cause death or serious injury to
personnel, and/or damage to equipment.
Always reserve an M area address, even when your program does not utilize
function keys.
SIMATIC TD 200 Operator Interface
C79000-G7076-C272-01
Message 1 - Priority 1 - (Highest)
MSB
7
6
5
1
2
3
9
10
11
17
18
19
25
26
27
33
34
35
41
42
43
49
50
51
57
58
59
65
66
67
73
74
75
Message 80 - Priority 80 - (Lowest)
TD 200 Parameters and Messages
4
3
2
4
5
6
12
13
14
15
20
21
22
23
28
29
30
31
36
37
38
39
44
45
46
47
52
53
54
55
60
61
62
63
68
69
70
71
76
77
78
79
LSB
1
0
7
8
16
24
32
40
48
56
64
72
80
D-7
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