Control Microsystems 5604 - Range and Resolution; Figure 7: Analog Input Mode Settings

5604 Input/Output (I/O) Module - Hardware Manual
October 19, 2007
16
5V
AIN0
20mA
J10
AIN1
J11
AIN2
J12
AIN3
J13
AIN4
J14
AIN5
J15
AIN6
J16
AIN7
J17
Figure 7: Analog Input Mode Settings
To select voltage mode, install the jumpers on the side labeled 5V. In the figure above, Analog
inputs 6 and 7 are configured for voltage mode.
5.2 Range and Resolution
Analog inputs channels 0 – 7 use a16-bit, unipolar, analog to digital (A/D) converter that measures
input voltages from 0 to 10V or currents from 0-20mA. In voltage mode, the input is represented by
a 15 bit unsigned real number. In current mode, the input is represented by a 14 bits unsigned real
number
Input resolution for channels 0-7 is:
 0.305mV/count in voltage mode
 1.22µA/count in current mode. There is 100% over range.
The following table shows the typical A/D output value for several input signals.
Current (mA)
Channel 0-7
Voltage (V)
Channel 0-7
Voltage (V)
Channel 8
A/D Output
0
0V
0V
0
1.22mA
0.305mV
NA
1
4
1.0
3.277
3277
10
2.5
8.192
8192
20
5.0
16.38
16384
39.999
9.9997
32.767
32767
Analog input 8 is configured for voltage mode only. Voltage ranges of up to 32.768V are
measurable using a 10 bit A/D converter and represented with 15 bits of data. The input resolution
on this channel approximately 0.03V/count.