Analog threshold trigger

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Short description

The output is set or reset depending on two configurable thresholds (hysteresis).

 

Connection

Description

Input Ax

Input the analog signal to be evaluated at input Ax.

Use the analog inputs AI1...AI8, the analog flags AM1...AM6, the block number of a function with analog output, or the analog outputs AQ1 and AQ2.

0 - 10 V is proportional to 0 - 1000 (internal value).

Parameter

A: Gain
Range of values: +- 10.00

B: Zero offset
Range of values: +- 10,000

On: On threshold
Range of values: +- 20,000

Off: Off threshold
Range of values: +- 20,000

p: Number of decimals
Range of values: 0, 1, 2, 3

Output Q

Q is set or reset depending on the set thresholds.

Parameters On and Off

The On and Off parameters can be provided by the actual value of another already-programmed function:

You select the required function by the block number.

 

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0BA4:

A: Gain

 Range of values 0.00...10.00

0BA2, 0BA3:

These parameters apply:

G: Gain in [%]

 Range of values 0..1,000 %

O: Offset

 Range of values ±999

On: On threshold
 Range of values 0..9
,999

Off: Off threshold
 Range of values 0..9
,999

Parameter p (number of decimals)

Parameter p applies only to the display of On, Off and Ax values in a message text.

Parameter p does not apply to the comparison of On and Off values. (The compare function ignores the decimal point.)

Timing diagram

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Description of the function

The function reads the value of the signal at the analog input Ax.

This value is multiplied by the value of parameter A (gain). Parameter B (offset) is added to the product, hence

(Ax * Gain) + Offset = Actual value Ax.

Output Q is set or reset depending on the set threshold values. See the following calculation rule.

 

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0BA2, 0BA3:

The function is as follows:

The offset parameter is added to the read analog value. The sum is multiplied by the value of the gain parameter.

Value = (AI+offset)*gain

Output Q is set to 1 if the calculated value exceeds the on threshold (TH high).

Q is reset to 0 when the value reaches or drops below the off threshold (TH low).

Calculation rule

Particular characteristics to be noted when configuring

Refer to the help on analog block parameters in the Analog value processing section.

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Note

The decimal point setting must be identical in the minimum and maximum range.

 

Overview