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9.6.8
Measured-Value
Representation
Measured-value
representation with various
ranges
System Manual
C79000-B8576-C109-03
After conversion, the digital result is stored in the module's RAM.
The bits in both bytes have the following significance:
Byte 0
7
6
5
4
3
2
12
11
10
9
8
7
2
2
2
2
2
2
2
Binary Value
Active Bit;
is not assigned
is set in case of internal error;
Error Bit;
in this case, the measured
value is not valid
(is set if the range
Overflow Bit;
limit is reached)
Figure 9-33
Digital Result Representation
Bits 0 to 2 in byte 1 have no influence on the measured value, they
only give information on measured-value representation. The
following table describes their significance in more detail.
Bit
Significance
OV
Overflow bit
E
Error bit
A
Active bit
*
A measuring-point overflow does not affect the overflow bits of the other channels;
i.e. the measured values of unaffected channels are correct and can be evaluated.
Please note the following special features:
• • Bit 7 in the high byte (2
12
measured-value representation (two's complement and value with
sign).
• • Bit 6 in the high byte (2
11
measured-value representation (no overrange).
• • The 466 module has no overrange.
• • Selective sampling is not possible with the 466 module. (Active bit
is not set.)
The 466 Analog Input Module
Byte 1
1
0
7
6
5
4
3
6
5
4
3
2
1
0
2
2
2
2
2
2
Signal
Meaning of the Signal
Status
Status
1
Range exceeded *
1
Broken wire
0
Not used
) indicates the sign for bipolar
) is not used in the case of bipolar
2
1
0
A
E
OV
9
9 - 95
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