2 Equipment Description
2.9 Field Termination Assemblies for IOP
R688 HPM High-Performance Process Manager Service 61
December 2020 Honeywell
2.9 Field Termination Assemblies for IOP
Two types of FTAs
There are two types of FTAs, Thermocouple (TC) and Resistive Temperature Device (RTD) that are
connected to the IOP through a Power Adapter assembly. One TC and one RTD FTA, or two of the same
type FTAs can be connected to one IOP through the Power Adapter.
Power Adapter
Installation
The Power Adapter provides power to the FTA(s) from the IOP and can be installed on an FTA
Mounting Channel.
IOP to Power Adapter connection
The IOP to Power Adapter connection is made using the standard model MU-KFTAxx (the suffix “xx”
represents the length of the cable in meters) IOP to FTA cable. The maximum allowable length is 50
meters (164 feet).
For CE Compliance applications, the model MU-KFTSxx IOP to FTA cable must be used. See the
Process Manager I/O Installation manual for detailed information.
Power Adapter to FTA connection
The Power Adapter connects to either FTA type with a model MU-KLAMxx (internal cabinet use) or
model MU-KLXxxx (external cabinet use) cable (one per FTA). The cable is limited to a maximum
length of 305 meters (1000 feet).
The model MU-KLAMxx cable has two individually shielded, twisted pair wires. The shield must be
connected to ground at the Power Adapter end of the cable only.
The model MU-KLXxxx external cabinet cable has four wires with a single braided shield. The braided
shield must be connected to ground at both the Power Adapter and FTA ends of the cable.
For CE Compliance applications, Belden model 83654 braided shield cable must be used. See the
Process Manager I/O Installation manual for detailed information.
Power Adapter indicators
The Power Adapter assembly has two LEDs, one for each cable, that indicate a grounded or shorted
cable. Each FTA has an LED that indicates the FTA is receiving power.
Cabling information
For more detailed information on cable selection, see the Process Manager I/O Installation manual or
the High-Performance Process Manager Planning manual.
Remote Hardened Low Level Multiplexer IOP (RHMUX)
The Remote Hardened Low Level Analog Input Multiplexer (RHMUX) IOP can process up to 32 inputs
from two 16-input FTAs.
The following figure illustrates the RHMUX IOP, Power Adapter, and Thermocouple FTA
interconnections for a CE Compliant application. See the Process Manager I/O Installation manual for
detailed information.