Rockwell-automation 1760-xxxx Pico GFX-70 Controllers User Manual Manuale Utente Scaricare il pdf (Pagina 153)

Publication 1760-UM002B-EN-P - March 2005

Wiring with Pico GFX-70 4-43

6. actual value plus offset

• Range A: Compare

>I1 > >I2

– The actual value

>I1 increases.

– The contact switches when the actual reaches the set point value.

– The actual value changes and falls below the value of the set point

value minus the hysteresis.

– The contact goes to the normal position.

• Range B: Compare

>I1 < >I2

– The actual value drops.

– The contact switches if the actual reaches the set point value.

– The actual value changes and rises above the value of the set point

value plus hysteresis.

– The contact goes to the normal position.

• Range C: Compare

>I1 > >I2 with offset

– This example behaves as described in Range A. The offset value is

added to the actual value.

• Comparison

>I1 = >I2

The contact switches on:

– If the set point is exceeded with the actual value rising.

– If the set point is undershot with the actual value decreasing.

The contact switches off:

– If the hysteresis limit is exceeded with the actual value rising.

– If the hysteresis limit is undershot with the actual value decreasing.

Arithmetic Function Block

Pico GFX-70 provides 32 arithmetic function blocks AR01 to AR32.

The arithmetic function block is used for arithmetic operations. All four basic

arithmetic operations are supported:

• add

• subtract

• multiply

• divide

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