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Analog Value Processing
6.4
Representation of the Digital Input Value
6.4.1
Digital Representation of a Measured Value (460 Analog Input Module)
Note
The 460 analog module cannot be used in safety-related systems.
Byte No.
Bit No.
Error bit; is set in the event of an internal error;
Figure 6-11. Representation of the Digitized Measured Value in the Case of the
460 Analog Input Module
Bits 0 to 2 are insignificant for the measured value. They provide information on the measured
value representation. Table 6-4 describes these bits.
Table 6-4. Meaning of Bits 0 to 2 in the Case of the 460 Analog Input Module
Bit
Meaning
OV
Overflow bit
F
Error bit
A
Activity bit
*
In the case of overflow at one measuring point, the overflow bits of the other channels remain unaffected; i.e. the
values of the other channels are correct and can be evaluated.
6-16
High Byte
n
15 14 13 12 11 10
2
2
2
2
2
2
12
11
10
9
8
binary measured value
the measured value read in is then invalid
Overflow bit (is set when the
measuring range limit is reached)
Signal
State
1
1
0
1
9
8
7
6
5
2
2
2
2
2
7
6
5
4
3
2
Activity bit;
Meaning of the Signal State
Range exceeded
Wire break
Cyclic scan or "Not active"
(for selective sampling)
Coding procedure not yet terminated in
selective sampling operation
S5-115F Manual
Low Byte
n+ 1
4
3
2
1
0
2
2
T
F
Ü
1
0
*
EWA 4NEB 811 6148-02
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