Analog Value Processing S5-115F Manual
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.
Figure 6-11. Representation of the Digitized Measured Value in the Case of the
460 Analog Input Module
n
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15 14 13 12 11 10 9 8 7 6 5 4 3 2
n+ 1
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0
1 0
T F Ü
binary measured value
Byte No.
Bit No.
Activity bit;
Error bit;
is set in the event of an internal error;
the measured value read in is then invalid
Overflow bit
(is set when the
measuring range limit is reached)
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
* 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.
Bit Meaning
Signal
State
Meaning of the Signal State
OV Range exceeded
*
Wire break
Cyclic scan or ”Not active”
(for selective sampling)
Coding procedure not yet terminated in
selective sampling operation
F
A
Overflow bit
Error bit
Activity bit
1
1
0
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6-16
EWA 4NEB 811 6148-02
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