XL15C Digital Inputs

Description

The XL15C controller has 8 Digital Inputs.

Digital Inputs are used to monitor external events, such as contact closures (10 mA, 5Vdc). The contact closures initiate alarms, monitor equipment status, and read pulse meters. These inputs are commonly used as inputs to Control Loops, Start /Stop Loops, Math Functions & Logic Loops.

Each Digital Input can be configured as Maintained, Momentary, Counter Slow, Counter Fast, Pulse Meter.

An external digital input source is connected to the digital input.

Purpose

Specify the sensor types and attributes for up to eight digital inputs.

Mode

Off-line or On-line.

Limits

Two digital inputs can be configured as counters. A counter counts the number of active inputs within the range of 1 through 65,535. Pulse No. 65,536 automatically resets the counter to 0.

Procedure

Expand the XL15C folder in the palette.
Drag the DigitalIn item onto the wiresheet on the right side of the screen.
Right-click the box and select Config to display the DigitalIn dialog.
Select the desired digital input kind from the Input Kind field.
If you select Maintained or Momentary, select the Engineering Units.
Select the State.
Select the Type (enabled only if the Input Kind selected is DigitalMaintained or DigitalMomentary).
If the Input Kind selected is Pulsemeter enter the Scale Factor.
Click OK to save the settings or Cancel to revert to the last saved settings.

Fields

Name	Definition
Input Kind	The input kind can be one of the following types: Unconfigured DigitalMaintained DigitalMomentary Counter Slow – They are capable of counting the number of transitions on the digital input within the range of 1 through 65,535. The 65,535th pulse will automatically reset the counter back to 0. At the most two digital inputs can be configured as Counters (both counter slow/fast put together). The pulse must last for at least 1.25 seconds frequency must not be greater than 0.4 Hz. Counter Fast - They are capable of counting the number of transitions on the digital input within the range of 1 through 65,535. The 65,535th pulse will automatically reset the counter back to 0. At the most two digital inputs can be configured as Counters (both counter slow/fast put together). The pulse must last for at least 20 milli-seconds frequency must not be greater than 15 Hz. Pulsemeter - At the most two digital inputs can be configured as Pulsemeters. If 2 DIS are configured as Pulsemeter, power from both will be summed.
Engineering Units	The Engineering Unit list contains all the engineering units you can assign to a digital input. Engineering Unit is enabled only for Input Kind of Maintained and Momentary.
Digital Configuration	State The state option has 2 choices: Normally Open and Normally Closed. By default, normally open is selected. Normally open = Off when the input contact is open and On when closed. Normally closed = Off when the input contact is closed and On when open. Type The type option has 2 choices: Unconfigured and Sensor occupancy. The type option is enabled only for Input Kind of Maintained and Momentary and disabled for all others.
Pulsemeter	Scale Factor The scale factor is enabled only when the Input Kind selected is Pulsemeter. The scale factor has a range of 0 – 1000 KWHR/pulse.

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