S5-115F Manual Analog Value Processing
The measured value is represented in different number formats. You can define the number
format via selector switches.
Table 6-5. 460 AI Module: Digital Representation of Analog Values as a Positive Binary Number
(4 to 20 mA), Channel Type 3
* Short circuit of the two-wire transducer
4096+OV
4095
3072
3071
2561
2560
2048
512
511
384
383
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Input
Voltage
in mV
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a
Digitized Measured Value
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15 14 13 12 11 10 9 8 7 6 5 4 3
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2 1 0
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A F OV
Overflow
Over-
range*
Nominal
range
Below
nominal
range limit
Wire-break
1024
1023.76
750.0
749.76
625.24
625.0
500.0
125.0
124.76
93.75
93.5
0.0
0 1 1 1 1 1 1 1 1 1 1 1 1
0 1 1 1 1 1 1 1 1 1 1 1 1
0 1 1 0 0 0 0 0 0 0 0 0 0
0 1 0 1 1 1 1 1 1 1 1 1 1
0 1 0 1 0 0 0 0 0 0 0 0 1
0 1 0 1 0 0 0 0 0 0 0 0 0
0 1 0 0 0 0 0 0 0 0 0 0 0
0 0 0 1 0 0 0 0 0 0 0 0 0
0 0 0 0 1 1 1 1 1 1 1 1 1
0 0 0 0 1 1 0 0 0 0 0 0 0
0 0 0 0 1 0 1 1 1 1 1 1 1
0 0 0 0 0 0 0 0 0 0 0 0 0
0/1 0 1
0/1 0 0
0/1 0 0
0/1 0 0
0/1 0 0
0/1 0 0
0/1 0 0
0/1 0 0
0/1 0 0
0/1 0 0
0/1 0 0
0/1 0 0
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Input
Current
in mA
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Units
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Range
32.796
31.992
24.0
23.992
20.008
20.0
16.0
4.0
3.992
3.0
2.992
0.0
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Explanation of Table 6-5
• Representation: Positive binary number
• Overrange condition at values above the upper nominal value but under double the nominal
span (16 mA); no overflow bit set!
• Lower range limit exceeded at values >0 and below the lower nominal value; no overflow bit
set!
• Overflow in the case of values exceeding double the nominal span (from 16 mA upwards);
overflow bit (OV) set
• Configuration aids
Set the measuring range of the module to 500 mV and plug in the 6ES5 498-1AA71 card.
The measuring range 4 to 20 mA is divided into 2048 units in the interval 512 to 2560 units. For
representation in the range 0 to 2048, 512 units must be subtracted per software
- configure channel type 3 with COM 115F
• FB 250 detects wirebreak ( 6.5 ).
When the lower limit of 384 units is exceeded, FB 250 ANEI sets error bit F ( 6.9).
• The 460 AI module can only be used with I/O type 13 (nonsafety-related).
Note
The 31.25-ohm shunt resistor integrated on the 498-1AA71 card prevents the
wirebreak signal (F bit is not set). You can therefore only detect a wirebreak by
scanning the measured value in the user program for a lower limit. You would then
interpret a measured value of less than e.g. 1 mA (=128 units) as a wirebreak.
EWA 4NEB 811 6148-02
6-17
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