4�2 Pressure monitoring / switching function. IFM PG2734

4.2 Pressure monitoring / switching function

OUT1 changes its switching state if it is above or below the set switching limits

(SP1, rP1)� The following switching functions can be selected:

• Hysteresis function / normally open: [OU1] = [Hno] (→ fig. 1).

• Hysteresis function / normally closed: [OU1] = [Hnc] (→ fig. 1).

First the set point (SP1) is set, then the reset point (rP1) with the requested difference�

• Window function / normally open: [OU1] = [Fno] (→ fig. 2).

• Window function / normally closed: [OU1] = [Fnc] (→ fig. 2).

The width of the window can be set by means of the difference between SP1 and rP1� SP1 = upper value, rP1 = lower value�

1 2

P = system pressure; HY = hysteresis; FE = window

4.3 Pressure monitoring / analogue function

The analogue output can be configured�

• [OU2] defines whether the set measuring range is provided as 4���20 mA

([OU2] = [I]) or as 20���4 mA ([OU2] = [InEG])�

Scaling can be set by means of the teaching process or by entering a value for the

ASP and AEP parameters�

• Teaching the analogue start point [tASP] or setting the parameter [ASP] defines at which measured value the analogue signal is 4 mA (20 mA at [InEG])�

• Teaching the analogue end point [tAEP] or setting the parameter [AEP] defines at which measured value the output signal is 20 mA (4 mA at [InEG])�

Minimum distance between [ASP] and [AEP] = 25 % of the of the final value of the measuring range�

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