XL15C Logic Loops

Description

The XL15C controller has 32 Logic Loops.

Each configured Logic Loop generates output(s) by applying logic operations on different analog and digital inputs selected. These logic loop outputs are commonly used as inputs to Control Loops, Start /Stop Loops, Math Functions.

Purpose

Each Logic Loop can be configured to generate one analog output and one digital output. This output can either be used to drive a remote or local output point or the output pseudo point can be used as inputs to Control Loops, Start /Stop Loops, and Math Functions.

Mode

Off-line or On-line.

Procedure

Expand the XL15C folder in the palette.
Drag the Logic item onto the wiresheet on the right side of the screen.
Right-click the box and select Config to display the Logic Loop dialog. The AcDo1 tab is selected by default. You can configure the following:

AcDo1 - Analog Compare Digital Output – Compares (<, >, or =) the values of 2 analog inputs and sets the output to true or false. Three ACDO pages (AcDo1, AcDo2, and AcDo3) are available in each Logic Loop.

AcDo2

AcDo3

And1 - Logical AND function – If and only if all configured digital input conditions (3 maximum) are true, the output will be on. Three AND pages (And1, And2, and And3) are available in each Logic Loop.

And2

And3

Or - Logical OR function – If any one of the configured digital input conditions (6 maximum) are true, the output will be ON. OR must be configured if the Logic Loop digital output is to be used.

DcAo - Digital Compare Analog Output – Sets the output value to equal analog input_1 if digital input is true and analog input_2 if the digital input is false. DCAO must be configured if the Logic Loop analog output is to be used.

Select the tabs you want to modify and enter appropriate information.
Click OK to save the settings or Cancel to revert to the last saved settings.

Fields

Name		Definition
AcDo
	Analog Compare	One combo to select Compare operator. Operators are ">", "<", or "=". The ACDO logic is Analog Input 1 > Analog Input 2, Analog Input 1 < Analog Input 2, or Analog Input 1 = Analog Input 2.
	Compare Deadband	he amount of difference between the input values where the output state does not switch. The output sets to ON when the condition goes true and sets to OFF when input 1 compared to input 2 minus the deadband is false. All values of input 2 within the deadband are treated as equal to input 1.
	On Delay Time	The time is seconds that the statement must be true before the output value will switch to ON
	Off Delay Time	The time is seconds that the statement must be false before the output value will switch to OFF
And
	Digital Not Inputs	You can select upto three digital not inputs. Each digital input can be either a local or a remote or a pseudo point. Typically, this digital input is taken from the pseudo output of ACDO. As this is a Digital Not input, it shows the complement (reverse) of the corresponding digital input value.
	On Delay Time	The time is seconds that the statement must be true before the output value will switch to ON.
	Off Delay Time	The time is seconds that the statement must be false before the output value will switch to OFF.
Or
	Digital Not Inputs	You can select upto six digital not inputs. Each digital input can be either a local or a remote or a pseudo point. Typically, this digital input is taken from the pseudo output of ACDO and/or AND. As this is a Digital Not input, it shows the complement (reverse) of the corresponding digital input value.
	On Delay Time	The time is seconds that the statement must be true before the output value will switch to ON.
	Off Delay Time	The time is seconds that the statement must be false before the output value will switch to OFF.
DcAo
	On Delay Time	The time is seconds that the statement must be true before the output value will switch to ON.
	Off Delay Time	The time is seconds that the statement must be false before the output value will switch to OFF.

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