3 wiring plan, Wiring plan for two-wire sensor, 5 connecting to power supply – VEGA VEGAMET 391 With SIL qualification User Manual
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5 Connecting to power supply
VEGAMET 391 • With SIL qualification
38704-EN-130228
measurement data are transmitted over the same two-wire cable. This
mode is provided for connection of measuring transducers without
separate operating voltage (sensors in two-wire version).
A passive input is not available with VEGAMET 391 with SIL qualifica-
tion.
5.3 Wiring plan
8
7
11
10
3
9
5
4
2
1
6
12
17
18
14
15
22
16
20
21
23
24
19
13
29
30
26
27
34
28
32
33
35
36
31
25
+
-
L+
N-
+
+ +
-
-
4
3
7 8
9
1
5
6
2
10
11
OK
ESC
on
1 2
SIL
3 4
Fig. 5: Wiring plan with two-wire sensor
1 Relay 1
2 Relay 2 (optional fail safe relay)
3 Relay 3 (SIL)
4 Relay 4 (SIL)
5 Current output
6 Operating voltage of the signal conditioning instrument
7 Measurement data input with sensor supply (active input)
8 Connection for HART modem for sensor parameter adjustment
9 Digital input 1 and 2
10 Common ground for digital input 1/2
11 4 … 20 mA/HART sensor (two-wire version)
Wiring plan for two-wire
sensor