ChX view parameters (output devices)

The
ChX
 view includes these parameters:
TIP:
These parameters are not available in Run mode.
Parameter
Description
Output Type
Indicates the output type as Current or Voltage.
Output Range
Indicates the operating range and signal type. Valid options are:
  • -10 V to 10 V
  • 0 mA to 20 mA
  • 4 mA to 20 mA
     (default)
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
Channel Offset
Specifies the offset value in engineering units.
This value is added to the channel data to determine the signal level.
Valid values are in the range of
-10,000,000…100,000,000
. The default is
0.0000
.
Hold for Initialization
Indicates that the device holds the output signal at present state until the output value received from the controller in the ChXData field is within 0.1% of full scale of the value being held. The outputs hold when:
  • Power-up occurs (holds at zero).
  • A new connection is established after a communication fault occurs.
  • The controller returns to Run mode after Program mode (continues to hold at the configured value that was held in Program mode).
The output channel holding lets the controller synchronize with the output, enables smooth output transitions and avoids rapid transients when control resumes from an interruption.
The output can be ramping to the configured hold value when the transition occurs. In this case, it continues the ramp until it completes or until the output value from the controller is within the 0.1% of the output signal.
When the checkbox is cleared, the output switches as quickly as possible to the first value commanded by the controller.
Scaling
Define 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.
  • Low Signal
Defines the lowest signal produced by the channel.
This value must be less than the
High Signal
value.
  • 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 equal the
Low Engineering
value. Valid values are in the range of
-10,000,000…100,000,000
 (float).
It is recommended to set the
High Engineering
value to correspond to the device Upper 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.
  • 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 in the range of
-10,000,000…100,000,000
 (float).
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.
Output State in Program Mode
Indicates the output state behavior when the controller transitions from Run to Program mode.
  • Hold Last State
Indicates that the current output remains at its last state.
  • User Defined Value
Specific value to step to when the controller is switched into Program mode.
  • Ramp to User Defined Value
Indicates that the output signal ramps from its last value to the
User Defined Value
 at the
Ramp Rate.
If the checkbox is cleared, the output signal steps to the
User Defined Value
 immediately on entering Program mode.
Not available when
Hold Last State
 is selected or in Run mode.
Output State in Fault Mode
Indicates the output state behavior when the controller faults or when communication is lost between the output device and its controller.
  • Hold Last State
Indicates that the current output remains at its last state.
  • User Defined Value
Specific value to step to if a fault occurs.
  • Ramp to User Defined Value
Indicates that the output signal ramps from its last value to the
User Defined Value
 at the
Ramp Rate.
If the checkbox is cleared, the output signal steps to the
User Defined Value
 immediately on entering Fault Mode.
Not available when
Hold Last State
 is selected or in Run mode.
Ramp Rate
Indicates the ramping rate set in the
Limits
 view.
The output ramping limits the speed at which an analog output signal can change, thus preventing fast transitions in output from damaging equipment that the output controls.
Provide Feedback
Have questions or feedback about this documentation? Please submit your feedback here.
Normal