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If the number of packed discrete bits requested is not an even multiple of eight,
the unused positions are set to zero. For example, if you request 10 packed discrete
input values, the 6 least significant bits of the second byte of information will be set to
zero.
TIWAY 1 Ti505 NIM User Manual
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TT = 3, 4, 5 = Discrete (1 byte)
1
2
MSB
0
0
X value
0
1
Figure 4 Discrete Data Element Format
TT = 6, 7, 8 = Packed discrete (1 byte)
1
2
3
MSB
First discrete bit number accessed.
Value
0
1
Figure 5 Packed Discrete Data Element Format
3
4
5
6
7
8
0
0
0
0
0
X
Bit Definition
Off
On
4
5
6
7
8
LSB
Next sequential discrete bit accessed.
Bit Definition
Off
On
LSB
NIM Primitives
4-13
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