Bürkert 8791, Руководство по эксплуатации

Страница: 21 / 186

21
Function
interfaces of the positioner 7.5.
Input for
set-point value
*
4 ... 20 mA **
0 ... 20 mA
Binary input
24 V DC
Communications
interface
Positioner
Analog position
feedback
(optional)
Initiator 1 / Initiator 2
24 V PNP NO
(optional)
Inputs Outputs
P
ower
supply
.
Operation
*
or optionally AS interface bus connection
** Default setting
note:
Optional inputs and outputs
are illustrated by dotted lines
Interfaces of the positioner Fig. 5:
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 > 12 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