WIKA CPH8000, Operating Instructions Manual, Page: 22 / 85

6 Commissioning, operation
22 WIKA Operating Instruction, Pascal ET, ET-P, ET/IS, ET-P/IS
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The module allow the 24V to supply directly the output loop for the transmitter.
Further, it can supply a 250Ω load resistance electronically switchable necessary to HART
communication, permitting to avoid the use of an external one.
The following figure shows the pin connections in HART module:
Figure 3
– HART module
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 module, 250Ω from module
Transmitter
HART slave