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4.4 Special functions list - SF

Timing diagram B: Function with positive difference Δ

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Functional description

The function fetches the analog signal at input Ax.

Ax is multiplied by the value of the A (gain) parameter, and the value at parameter B (offset) is added to product, i.e. (Ax • gain) + offset = actual value of Ax.

Output Q is set or reset, depending on the set (On) threshold and difference value (Δ). The function automatically calculates the Off parameter: Off = On + Δ, whereby Δ may be positive or negative. See the calculation rule below.

Calculation rule

When you set a negative differential value Δ, the On threshold ≥ Off threshold, and: Q = 1, if the actual value Ax > On

Q = 0, if the actual value Ax ≤ Off. See the timing diagram A.

When you set a positive differential value Δ, the On threshold < the Off threshold, and Q = 1, if:

On ≤ actual value Ax < Off.

See the timing diagram B.

Setting the Par parameter

The gain and offset parameters are used to adapt the sensors to the relevant application. View in programming mode (example):

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Manual, 04/2011, A5E03556174-01

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Image 217
Siemens 6ED1050-1AA00-0BE8 manual Timing diagram B Function with positive difference Δ, Functional description

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