S5-115F Manual Analog Value Processing
Table 6-10. 463 AI Module: Digital Representation of Analog Values as
Two's Complement (4 to 20 mA, Channel Type 3)
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Range
Meas.
Value
in mA
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31.984
28
27.984
24
23.984
20.016
20
16
12
8
4
3.984
3
2.984
2
1
0.816
0 016
0
-0.016
-0.816
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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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0
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OV
2047
1792
1791
1536
1535
1281
1280
1024
768
512
256
255
192
191
128
64
51
1
0
-1
-51
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 1 1 1 1 1 1 1 1
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 1
0 1 0 1 0 0 0 0 0 0 0 0
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 1 1 1 1 1 1 1 1
0 0 0 0 1 0 0 0 0 0 0 0
0 0 0 0 1 0 1 1 1 1 1 1
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 1 1 0 0 1 1
0 0 0 0 0 0 0 0 0 0 0 1
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 1 1 0 1
1
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Overflow
Overrange
Nominal range
Overrange
Wire break
recognition
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Explanation of Table 6-10
• Representation: Two's complement with offset
• Configuration aids
- Set the jumpers on the 463 module for the measuring range (4 to 20 mA) and the nominal
range (256 to 1280 units) ( 6.3.2)
- Configure channel type 3 with COM 115F
• FB 250 ANEI recognizes wire break if the current is less than 3 mA (method , 6.5).
FB 250 responds to errors depending on the I/O type:
- I/O type 13 (nonsafety-related): Error bit F of FB 250 ANEI is set. The program is con-
tinued.
- I/O type 16 (safety-related): Error bit F and the OV bit of the FB 250 ANEI are set.
The operating system responds according to safety
criteria.
EWA 4NEB 811 6148-02
6-23
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