B&R Industries X20 System, User Manual

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X20 system modules • Analog input modules • X20AI1744, X20AI1744-3
142 X20 system User's Manual 3.10
4.3.2.11.5.3 ADC configuration
Name:
ConfigOutput01 (X20AI1744)
ConfigGain01_MultiSample (X20AI1744-3)
The measurement range for the AD converter can be configured in this register.
Data type Value
USINT See bit structure.
Bit structure:
Bit Description Value Information
00 16 mV/V
01 8 mV/V
10 4 mV/V
Standard measurement range (bit 2 = 0)
11 2 mV/V
00 256 mV/V
01 128 mV/V
10 64 mV/V
0 - 1
Extended measurement range (bit 2 = 1)
1)
11 32 mV/V
0 Standard measurement range (2 to 16 mV/V) 2
1 Extended measurement range (32 to 256 mV/V)
1)
3 - 7 Reserved 0 (must be 0)
1) Starting with Firmware Version 4. In the standard measurement range (2 to 16 mV/V), open-circuit detection works reliably at all adjustable data rates. In
the extended measurement range (32 to 256 mV/V), open-circuit detection does not work reliably (because of the variable input impedance of the amplifier
in relation to the set data rate).
4.3.2.11.5.4 ADC cycle time
Name:
ConfigCycletime1_MultiSample
This register can be used to configured the ADC cycle time.
In order for multisampling to work, the X2X cycle time must be divisible by the ADC cycle time (i.e. results in a
whole number).
Data type Value Information
0 50 μs (default)
1 100 μs
USINT
2 - 255 Reserved
4.3.2.11.5.5 Number of measurement values
If the X2X cycle time is too short, then bot all 10 measurements can be performed. To reduce the load on X2X Link,
it makes sense to only transfer as many values as measurements that can be made. This is why it is possible to
configure the number of measured values to be transferred (see "Function model 1 - Multiple sampling").
Example: ADC cycle time 50 μs
X2X cycle time Number of measurement values to be transferred
250 μs 5
300 μs 6
350 μs 7
400 μs 8
450 μs 9
≥500 μs 10
Example:
ADC cycle time 100 μs
X2X cycle time Number of measured values to be transferred
300 μs 3
400 μs 4
500 μs 5
600 μs 6
700 μs 7
800 μs 8
900 μs 9
≥1 ms 10