Electronic pressure sensor
PI17xx
9
4.3 Defined state in case of a fault
If a fault is detected, the analogue output passes into a defined state ( = 21.5 mA).
In case of a fault indication ( = 21.5 mA)
u
Read parameters via IO-Link or contact the manufacturer.
4.4 Operating modes
The operating mode is defined by the wiring (
Ò
Electrical connection) and automatically recognised by
the unit.
4.4.1 2-wire operation
OUT2 (pin 2)
Analogue signal proportional to pressure 4…20 mA or 20...4 mA
4.4.2 3-wire operation
OUT1 (pin 4)
2 possibilities (automatic changeover)
• switching signal for pressure limit
• Communication via IO-Link
OUT2 (pin 2)
3 possibilities (manual changeover in the menu)
• switching signal for pressure limit
• Analogue signal proportional to pressure 4...20 mA
• Analogue signal proportional to pressure 20...4 mA
4.5 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] (
Ò
Figure hysteresis function).
•
Hysteresis function / normally closed: [OUx] = [Hnc] (
Ò
Figure hysteresis function).
First the set point (SPx) is set, then the reset point (rPx) with the requested difference.
•
Window function / normally open: [OUx] = [Fno] (
Ò
Figure window function).
•
Window function / normally closed: [OUx] = [Fnc](
Ò
Figure window function)
•
The width of the window can be set by means of the difference between SPx and rPx. SPx = upper
value, rPx = lower value.
Fig. 1: Hysteresis function
SP
rP
Fig. 2: Window function
