Siemens S5-135U/155U appendix Representation as Value and Sign, Shunt Resistor, Load Voltage

Analog Input/Output Modules

9.4.8Measured-Value Representation

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

Representation as

Value and Sign

Units

2047

1536

1535

1280

1025

1024

1023

512

511

256

1

0

±1

±51

Rated Range

0...10	0...1 V
V	mV

19.991999

15.001500

14.991499

10.011001

10.001000

9.99999.02

5.00500.00

4.99499.00

	0.976
0.098	0

0±

±0.976

0.098	±50
± 0.5

					Byte 0									Byte 1
0... 20	4...20	4...20	7	6	5	4	3	2	1	0	7	6	5	4	3	2	1	0
mA	mA 1)	mA 2)	211 210		29 28 27 26 25 24						23 22 21 20 0 0 0 OV
39.98	35.98	31.98	0	1	1	1	1	1	1	1	1	1	1	1	0	0	0	1
30.00	28.00	24.00	0	1	1	0	0	0	0	0	0	0	0	0	0	0	0	1
29.98	27.98	23.98	0	1	0	1	1	1	1	1	1	1	1	1	0	0	0	0
		20.00	0	1	0	1	0	0	0	0	0	0	0	0	0	0	0	0
20.02	20.02	16.02	0	1	0	0	0	0	0	0	0	0	0	1	0	0	0	0
20.00	20.00	16.00	0	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0
19.98	19.98	15.98	0	0	1	1	1	1	1	1	1	1	1	1	0	0	0	0
10.00	12.00	8.00	0	0	1	0	0	0	0	0	0	0	0	0	0	0	0	0
9.98	11.98	7.98	0	0	0	1	1	1	1	1	1	1	1	1	0	0	0	0
		4.00	0	0	0	1	0	0	0	0	0	0	0	0	0	0	0	0
0.02	4.0156	0.0156	0	0	0	0	0	0	0	0	0	0	0	1	0	0	0	0
0	4	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
±0.02	3.9844	±0.015	1	1	1	1	1	1	1	1	1	1	1	1	0	0	0	0
±1	3.184	6	1	1	1	1	1	1	0	0	1	1	0	1	0	0	0	0
		±0.816

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

3)

4)

5)

OV = Overflow bit

Shunt Resistor	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.
Current Limiting	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.
Load Voltage	The failure of the load voltage can be detected from the result of encoding
	(values < -51 units).
9-46	System Manual
	C79000-G8576-C199-06