General I/O Configuration
Config Register:
NOTE: If a Conf Register is configured, it takes immediate precedence over other configuration for the I/O, thus
requiring valid values in the registers. These values can be changed during runtime so care needs to be taken to not
mistakenly overwrite these values and program logic.
Analog Input uses five consecutive 16-Bit registers for configuration and each register has the following description:
%Rxx channel-1 Input Type selection
%Rxx+1 channel-2 Input Type selection
%Rxx+2 channel-3 Input Type selection
%Rxx+3 channel-4 Input Type selection
%Rxx+4 Filter Constant
For example, if user entered %R1 in Config Register then:
%R1 channel-1 Input Type selection
%R2 channel-2 Input Type selection
%R3 channel-3 Input Type selection
%R4 channel-4 Input Type selection
%R5 Filter Constant for all Input channels
Analog Input type can be selected by entering appropriate Values in configured % R.
Configuration Value to be entered
Disable 10
0 to 20mA 1
4 to 20mA 2
RTD 16
In the above example if user entered %R1=2, then channel-1 Input Type will be 4 to 20mA.
Filter constant is common for all Analog Input channels, Analog signals are filtered based on the constant value
given in the %Rxx+4 register. Filter constant value should be in the range of 0 to 7 anything beyond this range will
considered as constant value = 0.
Analog Inputs
NOTE: Refer to the datasheet and the Cscape Configuration chapter for details on how to use Cscape to configure
the digital filtering.
The analog inputs on the X4 allow current measurement from a variety of devices.
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