X20 system modules • Analog input modules • X20AI1744, X20AI1744-3
X20 system User's Manual 3.10
137
4.3.2.11.4 Register for "Standard" and "Bus Controller" function model
4.3.2.11.4.1 Module status
Name:
StatusInput01
The current state of the module is indicated in this register.
Data type
Value
USINT
See bit structure.
Bit structure:
Bit
Description
Value
Information
0
ADC value is valid
0
AD converter values
1
ADC value is invalid
0
OK
1
Line monitoring
1
Open line
0
ADC runs synchronous to the X2X Link
2
Only valid in synchronous mode
1
ADC does not run synchronous to the X2X Link
3 - 7
Reserved
-
4.3.2.11.4.2 Strain gauge value
Name:
AnalogInput01
This register contains the ADC's raw value for the full-bridge strain gauge with 24-bit resolution.
Data type
Value
Information
0x007FFFFF to 0xFF800001
Valid value range
0x007FFFFF
Overrun
0xFF800001
Underflow
DINT
0xFF800000
Invalid value
Effective resolution
In principle, the effective resolution of the AD converter is dependent on the data rate and the measurement range
(see "Effective resolution of the AD converter").
The following table shows how the effective resolution (in bits), or the effective value range of the strain gauge
value depend on the module configuration (data rate, measurement area).
Measurement range
±16mV/V
±8mV/V
±4mV/V
±2mV/V
Data rate
f
DATA
[Hz]
Bits
Scope
Bits
Scope
Bits
Scope
Bits
Scope
2.5
21.3
±1,290,000
20.8
±912,000
19.7
±425,000
18.7
±212,000
5
20.7
±851,000
20.3
±645,000
19.3
±322,000
18.3
±161,000
10
20.4
±691,000
19.9
±490,000
18.9
±244,000
17.9
±122,000
15
20.1
±562,000
19.3
±320,000
18.7
±212,000
17.7
±106,000
25
19.7
±425,000
19.2
±301,000
18.5
±185,000
17.5
±92,000
30
19.6
±397,000
19.0
±262,000
18.1
±140,000
17.1
±72,000
50
19.4
±346,000
18.8
±230,000
17.9
±122,000
16.9
±61,000
60
19.3
±320,000
18.8
±230,000
17.8
±114,000
16.8
±57,000
100
19.1
±280,000
18.5
±185,000
17.4
±86,000
16.4
±43,000
500
18.0
±130,000
17.3
±80,000
16.3
±40,000
15.3
±20,000
1000
17.2
±75,000
16.5
±46,000
15.6
±25,000
14.6
±12.00
2000
16.6
±49,600
16.1
±35,000
15.3
±20,000
14.3
±10,000
3750
16.2
±37,600
15.7
±26,600
14.7
±13,000
13.7
±6,600
7500
15.8
±28,500
15.3
±20,200
14.4
±10,800
13.4
±5,400
Table 22: Effective resolution of the strain gauge value in bits for the measurement range 2 to 16 mV/V
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