5
UK
4.2 Switching function
OUTx changes its switching state 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�
1
2
P = system pressure; HY = hysteresis; FE = window
4.3 Diagnostic function
Output 2 is used as diagnostic output based on the DESINA specification if [OU2]
= [dESI]�
• If there is no fault, the output is switched and carries UB+ (if P-n = PnP) or UB-
(if P-n = nPn)�
•
In case of malfunctions the output becomes inactive. The following
malfunctions are detected:
-measuring cell defective;
-short circuit in output 1
