Analog Value Processing   S5-115F Manual
Table 6-11. 463 AI Module: Digital Representation in the Case of 
Current Range 4 to 20 mA, Channel Type 4
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Range
Meas.
Value
in mA
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 35.982
 32
 28
 27.982
 24
 20.018
 20
 16
 12
  8
  4
 3.982
  3.018
  3
  2.982
  2
  1
  0
 
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Units
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a
Digitized Measured Value
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15 14 13 12 11 10  9  8  7  6  5  4  
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 OV
 2047
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 1280
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 1024
  768
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  256
    0
   -1
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 -128
 -192
 -256
 
 0  1  1  1  1  1  1  1  1  1  1  1
 0  1  1  1  0  0  0  0  0  0  0  0
 0  1  1  0  0  0  0  0  0  0  0  0
 0  1  0  1  1  1  1  1  1  1  1  1 
 0  1  0  1  0  0  0  0  0  0  0  0
 0  1  0  0  0  0  0  0  0  0  0  1
 0  1  0  0  0  0  0  0  0  0  0  0
 0  0  1  1  0  0  0  0  0  0  0  0
 0  0  1  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  0  0  0  0  0  0  0
 1  1  1  1  1  1  1  1  1  1  1  1
 1  1  1  1  1  1  0  0  0  0  0  1 
 1  1  1  1  1  1  0  0  0  0  0  0
 1  1  1  1  1  0  1  1  1  1  1  1
 1  1  1  1  1  0  0  0  0  0  0  0
 1  1  1  1  0  1  0  0  0  0  0  0
 1  1  1  1  0  0  0  0  0  0  0  0
 
  1
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 0
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  0
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Overflow
Overrange
Nominal range
Overrange
Wire break
recognition
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Explanation of Table 6-11
• Representation: Two's complement (beginning of nominal range: 0 units)
• Overrange condition in the case of values exceeding the nominal range 4 to 20 mA and values
up to roughly 40 % above the upper limit of the nominal value; no overflow bit set
• No error bits are set for values below the nominal range!
• Overflow at values starting at 40 % above the upper limit of the nominal value (28 mA); over-
flow bit (OV) set
• Configuration aids
- Set the jumpers on the 463 module for the measuring range (4 to 20 mA) and the nominal
range (0 to 1024 units)
- Configure channel type 4 with COM 115F 
• FB 250 ANEI detects wire break if the current is less than 3 mA (method  , 6.5). 
FB 250 ANEI responds to errors according to I/O type:
- I/O type 13 (nonsafety-related): Error bit F of FB 250 ANEI is set. The program is continued.
- I/O types 14/15/16 (safety-rel.):  The error bit F and the OV bit of FB 250 ANEI are set.
The operating system responds acc. to safety criteria.
6-24
EWA 4NEB 811 6148-02