WIKA Pascal ET - Manual (Page 20)

6 Commissioning, operation
20 WIKA Operating Instruction, Pascal ET and Pascal ET/IS
GB
6.1.2.4.1 HART wiring
Depending by several factors and combination that the user can found in a plant, there are many
wiring possibility depending by:

Using module internal or external Power Supply.

Using internal or external load resistance.

Simultaneous analog connection of AO TRX to one Input module for mA reading
Please consider, if the user enable the internal load resistance, this will be connected between the
+HART and COM terminals.
Here same examples:
Figure 4 - Case 1: 24V from m odule, 250Ω from module
Figure 5 - Case 2: 24V from m odule, 250Ω external
Transmitter
HART slave
Transmitter
HART slave
250
Ω