Vega MINITRAC 31 Operating Instructions Manual page 29

Adjustment and connec-
tion compartment - In-
struments with intrinsi-
cally safe signal output
Connection to a PLC
MINITRAC 31 • Foundation Fieldbus
( )
1
Fig. 18: Adjustment and connection compartment (Ex-ia) with instruments with
intrinsically safe signal output
1 Terminals for intrinsically safe signal output FF bus
2 Contact pins for the display and adjustment module or interface adapter
3 Terminals for the external display and adjustment unit
4 Ground terminal
If inductive loads or stronger currents are switched through, the gold
plating on the relay contact surface will be permanently damaged.
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.
+
1 2 6 7 8
5
(-)
5 Connecting to power supply
2
3
4
29