Rockwell-automation 1732E-OF4M12R ArmorBlock Dual-Port EtherNet/IP 4-P Manual de usuario descargar pdf (Pagina 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 kΩ.

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

Δt = Module channel update time (seconds)

TA = Digital filter time constant (seconds)

Xn = Present input, unfiltered PV

Yn = Yn-1 +

[Δt]

Δt + TA

- Y

- 1)

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Rockwell-automation 1732E-OF4M12R ArmorBlock Dual-Port EtherNet/IP 4-P Manual de usuario Pagina 52