6
4.1 Operating modes
The operating mode is defined by the wiring (→ 6 Electrical connection) and
automatically recognised by the unit�
4.1.1 2-wire operation
OUT2 (pin 2)
Analogue signal proportional to pressure 4…20 mA or 20���4 mA
4.1.2 3-wire operation
OUT1 (pin 4)
• Switching signal for system pressure limit
• Communication via IO-Link
OUT2 (pin 2)
3 options:
• Switching signal for system pressure limit
• Analogue signal proportional to pressure 4���20 mA
• Analogue signal proportional to pressure 20���4 mA
4.2 Switching function (only for 3-wire operation)
OUTx changes its switching status if it is above or below the set switching limits
(SPx, rPx)� The following switching functions can be selected:
•
Hysteresis function / normally open: [OUx] = [Hno] (→ fig. 1).
•
Hysteresis function / normally closed: [OUx] = [Hnc] (→ fig. 1).
First the set point (SPx) is set, then the reset point (rPx) with the requested
difference�
•
Window function / normally open: [OUx] = [Fno] (→ fig. 2).
•
Window function / normally closed: [OUx] = [Fnc] (→ fig. 2).
The width of the window can be set by means of the difference between SPx
and rPx� SPx = upper value, rPx = lower value�