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Honeywell MC-GHAO21 Galvanically Isolated Analog Output FTA

Configured for isolated analog current signal execution in Honeywell TDC 3000 and Experion PKS platforms, the Honeywell MC-GHAO21 (51305869-175) (MC-GHAO21 Galvanically Isolated Analog Output FTA) provides direct electrical conversion from control data to 4-20 mA field outputs.

Hardware Specifications

Parameter	Specification
Model	MC-GHAO21
Brand	Honeywell
Origin	USA
Part Number	51305869-175
Module Type	Galvanically Isolated Analog Output Field Termination Assembly
System Compatibility	Honeywell TDC 3000 / Experion PKS HPM and IOP systems
Output Signal	4-20 mA DC analog output
Output Channels	Not specified in available data
Isolation Type	Galvanic isolation, channel-to-channel and channel-to-system
Resolution	12 Bit
Maximum Load Resistance	<= 870 ohm
Protocol Support	4-20 mA HART loop protocol
Mounting Type	DIN rail / cabinet rack mounting
Operating Temp	-20 deg C to +70 deg C
Storage Temp	-40 deg C to +85 deg C
Relative Humidity	5% to 95% non-condensing
Weight	Not specified in available data
Dimensions	Not specified in available data
Power Consumption	Not specified in available data

4-20 mA HART Loop and Channel Isolation Characteristics

The MC-GHAO21 applies Honeywell process control interface technology for analog output signal handling. It receives digital output commands from the control system and generates isolated 4-20 mA current signals for field actuators.

Furthermore, the module supports HART communication signals superimposed on the analog output loop. The galvanic isolation structure separates field circuits from system electronics, which reduces ground loop influence and improves signal integrity in distributed control installations.

The isolated output architecture supports connection to control valves, I/P converters, valve positioners, and variable speed drive interfaces. Additionally, the isolation design assists with channel protection during field-side electrical disturbances.

Frequently Asked Questions

Q: Does the MC-GHAO21 support HART communication on the analog output channel?
A: Yes. The module supports HART digital communication superimposed on standard 4-20 mA analog output loops.

Q: What installation consideration applies to the isolated analog output wiring?
A: Field wiring should maintain proper shield termination practices and separate analog signal cables from high-voltage power conductors to reduce electrical interference.

Q: Can the MC-GHAO21 operate as a standalone analog output device?
A: No. The module is designed as a Honeywell DCS field termination assembly and requires compatible Honeywell control system hardware.

Field Installation Guidelines

• Install the MC-GHAO21 inside an approved control cabinet or DIN rail mounting arrangement according to the system hardware design.
• Verify terminal assignments before connecting field devices to prevent incorrect current loop wiring.
• Use shielded instrumentation cable for analog output circuits where required by the installation environment.
• Connect cable shields according to the site grounding standard to reduce electromagnetic interference.
• Separate analog signal wiring from AC power and high-current switching circuits.
• Confirm system compatibility with the Honeywell controller and I/O hardware before commissioning.
• Check output loop continuity and field device response after completing electrical installation.

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