Owner manual

21
Function
7.5. Interfaces of the positioner
Input for
set-point value *
4 – 20 mA **
0 – 20 mA
Binary input
24 V DC
Communications
interface
Positioner
Analog position
feedback
(optional)
Proximity switch 1 /
Proximity switch 2
24 V PNP NO
(optional)
Inputs
Outputs
Supply voltage.
Operation
* or optionally AS-Interface bus connection
** Default setting
Note:
Optional inputs and outputs
are illustrated by dotted lines
Figure 5: Interfaces of the positioner
The positioner Type 8791 is a 3-wire device, i.e. the power (24 V DC) is supplied separately from the set-
point value signal.
• Input for nominal position value (4 – 20 mA corresponds to 0 – 100%)
(depends on the position of DIP switch 1).
• Binary input
When applying voltage of > 10 V, SAFEPOS will be activated, i.e. the valve is moved into the safety position.
• Analog position feedback (optional)
The position of the valve can be relayed to the PLC via an analog 4 – 20 mA output (4 – 20 mA corresponds to
0 – 100%).
english
Type 8791