D-7
SIMATIC TD 200 Operator Interface
C79000-G7076-C272-01
Byte 0
Byte 1
Byte 2
Byte 3
Byte 4
Byte 5
Byte 6
Byte 7
Byte 8
Byte 9
Message 1 - Priority 1 - (Highest)
76 54 3 210
910111213141516
17
25
33
41
49
57
65
73
18
26
34
42
50
58
66
74
19
27
35
43
51
59
67
75
20
28
36
44
52
60
68
76
21
29
37
45
53
61
69
77
22
30
38
46
54
62
70
78
23
31
39
47
55
63
71
79
24
32
40
48
56
64
72
80
MSB LSB
12345678
Message 80 - Priority 80 - (Lowest)
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.
TD 200 Parameters and Messa
es
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