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9.6.8
Measured-Value Representation
Measured-Value
After conversion, the digital result is stored in the module's RAM.
Representation
The bits in both bytes have the following significance:
with Various
Ranges
Active Bit;
Error Bit;
Overflow Bit;
Figure 9-32
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
OV
*
Please note the following special features:
System Manual
C79000-G8576-C199-06
Byte 0
6
5
3
7
4
2
12
11
10
9
8
7
2
2
2
2
2
2
Binary Value
is not assigned
is set in case of internal error;
in this case, the measured value
is not valid
(is set if the range limit is reached)
Digital Result Representation
Significance
Signal Status
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.
12
Bit 7 in the high byte (2
) indicates the sign for bipolar measured-value
representation (two's complement and value with sign).
11
Bit 6 in the high byte (2
) is not used in the case of bipolar
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).
Analog Input/Output Modules
Byte 1
7
6
5
4
0
1
5
4
3
2
1
6
2
2
2
2
2
2
Meaning of the
Signal Status
1
Range exceeded *
1
Broken wire
0
Not used
3
2
1
0
0
A
E
OV
2
9-91
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