ChX view parameters (input devices)

The
ChX
 view includes these parameters:
TIP:
These parameters are not available in Run mode.
Parameter
Description
Input Type
Displays the input type of the device.
Input Range
Indicates the operating range and signal type. Valid options are:
  • -10 V to 10 V
  • 0 V to 5 V
  • 0 V to 10 V
  • 0 mA to 20 mA
  • 4 mA to 20 mA
     (default)
Tip
: To use HART field devices, select
4 mA to 20 mA
.
Enable HART
Indicates HART communication is enabled on the channel. Enable HART for any channel that has a HART device connected to it to display information in the
HART Device Information
 view.
Clear the checkbox to disable HART communication. When HART communication is disabled:
  • HART messages are not sent on the channel.
  • HART pass-through messages are not sent.
  • HART data for this channel is not updated in the input tag.
Enable HART
 is not configurable when:
  • In Run mode
  • Input Range
     for input devices is not set to 0 to 20 mA or 4 to 20 mA
  • Output Range
     for output devices is not set to 0 to 20 mA or 4 to 20 mA
Sensor Offset
Enter the offset value in engineering units, which is added to the channel data after scaling the analog signal to engineering units.
Valid values are from -10,000,000 through 100,000,000. The default value is 0.0000.
Scaling
Defines how the signal from the device corresponds to the measurement data.
  • Engineering Units
Defines the unit of the Engineering values.
  • High Signal
Defines the maximum signal produced by the channel.
This value must be greater than the
Low Signal
 value. Default is 20.0000.
  • Low Signal
Defines the lowest signal produced by the channel.
This value must be less than the
High Signal
 value. Default is 4.0000.
  • High Engineering
Defines the engineering units that corresponds with a signal value equal to the
High Signal
.
For example, if a temperature transmitter produces 20 mA current at 750 °C, the
High Engineering
value is 750.
This value cannot be equal to the Low Engineering value. Valid values are from -10000000 through 100000000 (float). Default is 100.0000.
It is recommended to set the
High Engineering
 value to correspond to the device
Upper Range
value so that the device and module use the same engineering units. When online, this value is displayed in the
HART Device Information
 view.
  • Low Engineering
Defines the engineering units that corresponds with the signal value equal to the
Low Signal
.
For example, if a temperature transmitter produces 4 mA current at -180 °C, the
Low Engineering
value is -180.
This value cannot equal the High Engineering value. Valid values are from -10000000 through 100000000 (float). Default is 0.0000.
The recommendation is to set the
Low Engineering
value to the device
Lower Range Value
so that the device and device use the same engineering units. When online, this value is displayed in the
HART Device Information
 view.
Digital Filter
Specifies a filter time constant value from 0 through 20100 milliseconds. The default is 0.
This is a first order lag filter that smooths input transitions. (It is called a digital filter because it is done in the software by the device, not by a hardware filter).
A value of 0 turns the
Digital Filter
 off. Measured changes in the signal value pass immediately to the controller.
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