Configuration Tab 1756-IT6I and IT6I2, floating point

Use this tab to configure the 1756-IT6I floating point, analog input module.
Use the
Configuration
 tab to:
  • Select the channel to configure
  • Enter scaling values
  • Enter a real time sample period
  • Enter an input range
  • Enter a calibration bias value
  • Select a digital filter time
  • Select temperature units
  • Select a sensor type
  • Select a notch filter frequency
  • Enable or Disable cold junction
  • Select remote CJ compensation
  • Enter a cold junction offset value
    TIP:
    The module’s configuration information is stored in the controller and the controller configures the
    controller
    A device that controls machines or processes elements (for example, a programmable controller or relay panel).
    module.
    A device, typically an I/O device that communicates with the controller. The controller, a particular 1756-IB16I, or a PanelView are all considered modules.
Parameters
Channel
Select one of the channel buttons to display its information on this tab.
Scaling
  • Low Signal
    Enter a low scaling value in signal units, millivolts or degrees Celsius or Fahrenheit when linearizing to temperature. You must set this input point within the module default signal range, -12 to 78 mv if not linearizing. This value is scaled to Low Engineering value.
  • Low Engineering
    Enter a value in user engineering units to which the Low Signal should be scaled. All values sent to/from the module are in engineering units.
  • High Signa
    l
    Enter a high scaling value in signal units, millivolts or degrees Celsius or Fahrenheit when linearizing to temperature. You must set this input point within the module default signal range, -12 to 78 mv if not linearizing. This value is scaled to High Engineering value.
  • High Engineering
    Enter a value in user engineering units to which the High Signal should be scaled. All values sent to/from the module are in engineering units.
Input Range
Select the operating range of a specific channel:
  • -12 to 78mV
  • -12 to 30 mV
Calibration Bias
Enter an offset value. This value is added to the input during the calibration calculation to compensate for inaccuracies of the sensor.
Digital Filter
Select a filter time constant in milliseconds. This field is a first order lag filter that smoothes input transitions.
Sensor Type
Select a thermocouple type from the list to linearize the analog signal into a temperature value. Thermocouple modules support nine sensor types in addition to millivolt inputs:
B, C, E, J, K, N, R, S, & T.
none = millivolts
You can configure each sensor type for specific high and low values of signals that are linearized.
Notch Filter
Select a frequency. This filter attenuates the selected frequency and its harmonics in the input signal. You can choose the filter frequency to filter out line noise.
Cold Junction Offset
Enter an offset value. This value is added to the CJ input during the temperature calculation to compensate for inaccuracies of the cold junction sensor.
RTS (Real Time Sample Period)
Enter the time (in milliseconds) to indicate how often the module’s inputs are to be sampled (25ms to 10,000ms). If any of the channels are being linearized, the minimum allowed RTS is 50ms.
There is only one RTS for the entire module (you can’t have a different one for each channel).
The RTS period controls how often the module prepares new readings. The Requested Packet Interval (RPI on the Connection tab) controls how often the module sends its current readings to the controller. Generally these two values should be similar so that each reading gets sent to the controller one time.
Temperature Units
Select a temperature scale: Fahrenheit or Celsius for the entire module.
Cold Junction Disable
If you are:
Then:
using a cold junction sensor for compensation performed on the module
Do not select this box to enable this feature and connect a CJS to measure the cold junction temperature of the thermocouple wiring.
cold junction sensor (CJS)
A thermistor that measures the ambient temperature of the thermocouple wire connected to the screw terminals. The measured temperature is used to properly compensate for the cold junction thermoelectric effect present between the thermocouple wiring and the terminals. The CJS may be mounted on the terminal block, between terminals 10 and 14, or positioned remotely in a Remote Termination Block (RTB).
not using a CJS
Select this box to disable this feature
There is only one Cold Junction Disable for the entire module (you can’t have a different one for each channel).
Remote CJ Compensation
If you are using:
Then:
a CJS on the terminal block
do not select this box
an RTB to connect wiring to your module
remote termination block (RTB)
It is a customer wiring option. The customer field wire is run to the RTB instead of directly to the module terminal block. The RTB then provides pre-wired connections to the module terminal block. The RTB offers a built-in Cold Junction Sensor and an isothermal bar to ensure all terminals are at the same temperature for more accurate cold junction compensation. For applications requiring higher accuracy, use an RTB for improved cold junction performance.
select this box
There is only one Remote CJ Compensation for the entire module (you can’t have a different one for each channel).
OK
Select this button to accept your edits on any tab and close the dialog.
Cancel
Select this button to cancel your edits on any tab and close the dialog.
Apply
Select this button to apply your edits on any tab and continue editing.
If:
  • You are online in Program, Remote Program or Remote Run mode and,
  • This controller is the owner controller and,
  • You have changed the module’s configuration in the software,
when you select the Apply or the OK button, the information is automatically sent to the controller. The controller tries to send the information to the module (if the module’s connection is not inhibited). If you don’t select Apply, your changes are not sent to the controller.
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