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8 measured-value representation – Siemens S5-135U/155U User Manual

Page 428

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9-46

System Manual

C79000-G8576-C199-06

9.4.8

Measured-Value Representation

(rated input ranges 0 to 1 V, 0 to 10 V, 0 to 20 mA, 4 to 20 mA)

Units

Rated Range

Byte 0

Byte 1

0...10

V

0...1 V

mV

0... 20

mA

4...20

mA

1)

4...20

mA

2)

7

2

11

6

2

10

5

2

9

4

2

8

3

2

7

2

2

6

1

2

5

0

2

4

7

2

3

6

2

2

5

2

1

4

2

0

3

0

2

0

1

0

0

OV

2047
1536

19.99
15.00

1999
1500

39.98
30.00

35.98
28.00

31.98
24.00

0
0

1
1

1
1

1
0

1
0

1
0

1
0

1
0

1
0

1
0

1
0

1
0

0
0

0
0

0
0

1
1

3)

1535
1280
1025

14.99

10.01

1499

1001

29.98

20.02

27.98

20.02

23.98
20.00
16.02

0
0
0

1
1
1

0
0
0

1
1
0

1
0
0

1
0
0

1
0
0

1
0
0

1
0
0

1
0
0

1
0
0

1
0
1

0
0
0

0
0
0

0
0
0

0
0
0

4)

1024
1023
512
511
256
1
0
– 1
– 51

10.00
9.99
5.00
4.99

0.098
0

0.098
– 0.5

1000
999.02
500.00
499.00
0.976
0

0.976
–50

20.00
19.98
10.00
9.98

0.02
0
–0.02
–1

20.00
19.98
12.00
11.98

4.0156
4
3.9844
3.184

16.00
15.98
8.00
7.98
4.00
0.0156
0
–0.015
6
–0.816

0
0
0
0
0
0
0
1
1

1
0
0
0
0
0
0
1
1

0
1
1
0
0
0
0
1
1

0
1
0
1
1
0
0
1
1

0
1
0
1
0
0
0
1
1

0
1
0
1
0
0
0
1
1

0
1
0
1
0
0
0
1
0

0
1
0
1
0
0
0
1
0

0
1
0
1
0
0
0
1
1

0
1
0
1
0
0
0
1
1

0
1
0
1
0
0
0
1
0

0
1
0
1
0
1
0
1
1

0
0
0
0
0
0
0
0
0

0
0
0
0
0
0
0
0
0

0
0
0
0
0
0
0
0
0

0
0
0
0
0
0
0
0
0

5)

1)

With data format setting 0 to 1023 (switch on module)

2)

With data format setting 256 to 1279 (switch on module)

3)

Overflow

4)

Overrange

5)

Rated

range

OV = Overflow bit

A 50 ohm shunt resistor is used for the 0 to 20 mA range; for 4 to 20 mA,
the resistor value is 62.5 ohms.

The shunt resistors are permanently fitted to the 463 analog input module.
Broken wire detection is not possible.

For the 4 to 20 mA current measuring range, a broken wire can be detected
with currents > 3 mA.

If the positive and negative terminals of the transducer are short-circuited
when two-wire transducers are used (4 to 20 mA), the current is limited to
approximately 28 mA. Until the thermal current limiting circuit responds
(about 3 s) a short-circuit current of about 250 mA flows; this sets the
overflow bit for the short-circuited channel for this duration.

The failure of the load voltage can be detected from the result of encoding
(values < -51 units).

Measured-Value
Representation as
Value and Sign

Shunt Resistor

Current Limiting

Load Voltage

Analog Input/Output Modules