24
5 Connecting to power supply
SOLITRAC 31 • Profibus PA
43834-EN-211203
The contact is then no longer suitable for switching low-voltage
circuits.
Inductive loads also result from the connection to a PLC input or
output and/or in combination with long cables. It is imperative that you
take measures to extinguish sparks to protect the relay contact (e.g. Z
diode) or the transistor or 8/16 mA output.
Instruments with intrinsically safe signal output
You can find detailed information on the explosion-protected versions
(Ex-ia, Ex-d) in the Ex-specific safety instructions. These safety
instructions are part of the scope of delivery and come with the Ex-
approved instruments.
6
8
9
4
5
7
1
2
3
1
1
24
/L
/N
PE
56
22
11
12
21
22
19
20
18
17
14
13
16
15
12
Fig. 15: Electronics and connection compartment (Ex-d) with instruments with
intrinsically safe signal output
1 Voltage supply
2 Relay output
3 Adjustment bus address for Profibus PA
4 Signal input 4 … 20 mA (active sensor)
5 Switching input for NPN transistor
6 Switching input floating
7 Transistor output
8 Interface for sensor-sensor communication (MGC)
9 Setting the bus address for sensor-sensor communication (MGC)
4)
Electronics and connec-
tion compartment - In-
struments with intrinsi-
cally safe signal output
4)
MGC = Multi Gauge Communication
