Channels view parameters (output devices)

The
Channels
view for the HART output device includes these parameters.
TIP:
These parameters are not available in Run mode. The available parameters vary depending on the devices.
Parameter
Description
Channel
Displays the channel number to which this configuration applies.
Output Type
Displays the output type of the device.
Output Range
Determines the output range for the Current or Voltage output type.
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
Output State During
Program Mode
Determines channel action when the controller transitions to Program mode.
  • Hold Last State
     causes the output to remain at the last value sent from the controller prior to being placed in Program Mode.
  • User Defined Value
     forces the output to whatever value is entered in the field. The value is entered in the
    ChX
     view in the engineering units defined by the scaling parameters for the channel.
Output State During
Fault Mode
Determines channel action when a fault occurs.
  • Hold Last State
     causes the output to remain at the last value sent from the controller prior to loss of communication.
  • User Defined Value
     forces the output to whatever value is entered in the field. The value is entered in the engineering units defined by the scaling parameters for the channel.
High Signal
Defines the maximum signal produced by the channel. This value must be greater than the Low Signal value.
Default is 20.0000.
Not configurable when in Run mode.
Low Signal
Defines the lowest signal produced by the channel. This value must be less than the High Signal value.
Default is 4.0000.
Not configurable when in Run mode.
Units (Signal)
Shows the unit of measurement for
High Signal
 and
Low Signal
.
High Engineering
Defines the engineering units that corresponds with a signal value equal to
High Signal
. For example, suppose you have a temperature transmitter that produces 20 mA current at 750 °C. The
High Engineering
 value in this case would be 750.
This value cannot be equal to the
Low Engineering
 value.
Valid values are in the range of -10000000...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.
Not configurable when in Run mode.
Low Engineering
Defines the engineering units that corresponds with the signal value equal to
Low Signal
. For example, suppose you have a temperature transmitter that produces 4 mA current at -180 °C. The
Low Engineering
 value in this case would be -180.
This value cannot be equal to the
High Engineering
 value.
Valid values are in the range of -10000000...100000000 (float). Default is 0.0000.
It is recommended to set the
Low Engineering
 value to the device Lower 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.
Not configurable when in Run mode.
Units (Engineering)
Shows the unit of measurement for
High Engineering
 and
Low Engineering
 and for the channel’s output value.
Keep HART Replies for
Specifies the length of time that HART replies that are received from the Field Device in response to Pass-through messages are kept. You must retrieve them within this time or the device discards them.
Valid values are from 1 through 255 seconds. Default is 15.
Applies to all channels on the device.
Pass through
Indicates how often pass-through messages occur. The valid values are:
  • Once per two channels scanned
     - A pass-through message is sent (if one is pending), after 2 channels have PVs scanned to the input tag.
  • Once per module scan
     - Select if you want to minimize the impact pass-through clients have on reading the PVs into the input tag.
  • Once per channel scan
     - A pass-through message is sent (if one is pending), after each channel has its PVs scanned to the input tag.
Select from the list to give pass-through clients, such as FactoryTalk Asset Centre, higher priority than reading PV, SV, TV, FV and field device health into the input tag.
When Communication Fails in Program Mode
Specifies the behavior of the outputs if communications fail in Program mode:
  • Leave outputs in Program Mode state
  • Change outputs to Fault Mode state
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