Connection Values At The Terminals; Wiring Diagrams; Overview - Siemens SITRANS AW 7MP3112 Series Operating Instructions Manual

6.1.3

Connection values at the terminals

Input and output terminal values
Keep to the following input and output values at the terminals as shown in the wiring diagrams
in the section "Wiring diagrams" (Page 33).
Note
Due to the internal communications resistor, the supply voltage of the field device varies
depending on the set current and no-load voltage.
● Power supply for field devices (terminal 1):
– No-load voltage can be set between 8 V and 23 V in steps less than 0.1 V
– Electric current: 4 mA DC ≤ I
● 4 bis 20 mA/HART input (terminal 2):
– Electric current: 4 mA DC ≤ I
● High-resistance HART input/output connectors (terminals 4, 5, 6):
– Input impedance 3.7 kΩ for HART communication
– Input impedance DC = ∞
Checking the terminal connections
After wiring up the WirelessHART adapter, make the following checks:
● Are the terminals wired up correctly?
● Is the cable gland tight?
6.2

Wiring diagrams

6.2.1

Overview

Options for connecting the WirelessHART adapter to a field device
There are various options for connecting the WirelessHART adapter to a field device
electrically:
● Connection of a two-wire field device and supplying the device with power
● Connection of a four-wire field device
WirelessHART Adapter SITRANS AW200
Operating Instructions, 02/2020, A5E02777161-AA
NE 43)
NE 43)
≤ 20 mA DC (according to NAMUR recommendation
out
≤ 20 mA DC (according to NAMUR recommendation
in
Connecting
6.2 Wiring diagrams
33