Rockwell Automation 1732E-OF4M12R ArmorBlock Dual-Port EtherNet/IP 4-Point Analog Input/Output - Manual (Page 52)

44 Rockwell Automation Publication 1732E-UM005A-EN-E - July 2012
Chapter 4 Configurable Features for the Analog Input and Output Modules
Input Types and Ranges
Each of the four 1732E-IF4M12R input points can be configured as either
current input or voltage input, with current mode as default configuration.
The user must do two things to use the input as a current or voltage device:
• Wire for the correct input type (see
page 10 )
• Configure accordingly through RSLogix 5000 (see
page 25 )
Current Mode
In current mode, the module supports either 0…20 mA or 4…20 mA input
currents independently for each channel, with the latter as default input range.
Voltage Mode
In voltage mode, the module supports both unipolar ranges of 0…10V and 0…5V,
and bipolar ranges of ±5V and ±10V. The nominal common mode input
impedance per channel in voltage mode is 125 k
Ω
.
Digital Filters
The digital filter smooths input data noise transients for all channels on the
module. This feature is applied on a per channel basis. The digital filter value
specifies the time constant for a digital first order lowpass filter on the input. It is
specified in units of milliseconds. A value of 0 disables the filter.
The digital filter equation is a classic first order lag equation.
Yn = Present output, filtered peak voltage (PV)
Yn-1 =Previous output, filtered PV
Δ
t = Module channel update time (seconds)
TA = Digital filter time constant (seconds)
Xn = Present input, unfiltered PV
Yn = Yn-1 +
[
Δ
t]
Δ
t + TA
(X
n
- Y
n
- 1)