XL15C Analog Inputs

Description

The XL15C controller has 8 Analog Inputs.

Analog Inputs are used to monitor external conditions, such as temperature, humidity or pressure. These inputs are commonly used for monitoring and as inputs to Control Loops, Start /Stop Loops, Math Functions & Logic Loops.

Each Analog Input may be configured as Analog or Digital.

Analog Inputs configured as Analog can receive Input from various types of sensors. Analog Inputs configured as Digital can only receive digital signals as inputs.

Purpose

Specify the attributes for up to eight analog inputs.

Mode

Off-line or On-line.

Limits

One Excel 15C Plant controller supports up to eight analog inputs (AI1 through AI8) as follows: 0 to 8,000 ohms (+-10 ohms), 0 to 10V dc, 4 to 20 mA, using an external 500 ohm resistor with a 2-10V dc input, digital sensing (contact closure).

Procedure

Expand the XL15C folder in the bottom-left file explorer palette.
Drag the AnalogIn item onto the wiresheet on the right side of the screen.
A dialog appears with the default name for the analog input. You can change the name of the analog input and click OK. The dialog displays the Point Name, Status, and Point ID. The Point ID is automatically generated and indicates the number of the analog input.
You can add upto a maximum of 8 analog inputs. Any more analog input object dropped on the wiresheet would start showing a Fault status.
Right-click the object and select Config to invoke the analog input configuration dialog.
Select the desired analog input type from the Input Kind field.

To configure an analog input as Resistive 20Kntc:

Select Resistive 20Kntc from the Input Kind list. The Engineering Units and Sensor fields are set to default values and grayed out.

Select the Input Type if the input is to be shared across the network.

To configure an analog input as Voltage or Resistive:

Select Resistive or Voltage from the Input Kind list.

Select an Engineering Unit.

Enter information in the Sensor fields.

Select the Input Type if the input is to be shared across the network.

To configure an analog input as Digital:

Select Digital Active Short/Digital Active Open from the Input Kind list.

Select an Engineering Unit. The Input Low, Input High, Output Low and Output High values are entered by the tool.

Click OK to save the settings or Cancel to revert to the last saved settings.

Fields

Name	Definition
Input Kind	The input kind must be one of the following types for an analog input: Unconfigured (default) Resistive Voltage 20KNTC Digital Active Short Digital Active Open The Analog Inputs may be configured as analog or digital.
Engineering Units	This list is enabled when the Analog Input is configured as Resistive or Voltage. The measurement types are listed here. When you select an Engineering Units option, the corresponding Engineering unit appear in the Sensor fields.
Sensor	The following fields are available: Input Low Input High Output Low Output High
Input Type	The following Input Types are available: Other OutdoorAirTemp OutdoorAirHumidity DischargeAirTemp An Input type assigned to one Analog Input cannot be used again for another Analog Input. For example, if you select OutdoorAirTemp for Analog Input_1 it cannot be a selection of any other Analog Input. To select OutdoorAirTemp for (say ) Analog_Input_2 the selection for Analog_Input_1 needs to be changed to Other.

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