Description

The Honeywell MC-GHAO11 51309540-175 is a 16-channel galvanically isolated, intrinsically safe Field Termination Assembly (GI/IS FTA) designed for analog output signal processing within Honeywell TotalPlant Solution (TPS) control systems. Working in tandem with the Honeywell MC-PAOY22 or MU-PAOY22 16-point Analog Output Input/Output Processor (IOP), this module routes 4-20 mA control signals from Process Manager (PM), Advanced Process Manager (APM), High Performance Process Manager (HPM), and Enhanced High Performance Process Manager (EHPM) controllers to field actuators, control valves, and positioners operating in hazardous locations.

This conformally coated assembly (designated by the "MC-" prefix) is built for installation in harsh industrial environments where exposure to high humidity or atmospheric pollutants (ISA G3/GX rated) is present. The Honeywell MC-GHAO11 51309540-175 incorporates dedicated connectors and built-in filtering for an external HART subsystem, allowing bi-directional digital HART communication to pass through without interfering with TPS analog control loops.

Featuring a Size B footprint with compression-type field wiring terminals, the Honeywell MC-GHAO11 51309540-175 supports one-on-one IOP redundancy to ensure continuous automatic control during module servicing or processor switchovers. Unlike standard analog output field termination assemblies, the MC-GHAO11 is specifically engineered for galvanically isolated intrinsically safe loops and does not incorporate standby manual unit connectors.

Features

• Provides 16 galvanically isolated 4-20 mA output channels for field devices operating in intrinsically safe and hazardous applications.
• Includes integrated HART subsystem connectors and onboard noise filters to prevent signal interference between digital HART communication and TPS control signals.
• Supports 1-on-1 I/O redundancy when paired with redundant MC-PAOY22 or MU-PAOY22 Analog Output Processors.
• Conformally coated circuit board construction rated for harsh G3/GX corrosive environmental conditions.
• Equipped with compression-type screw terminal blocks accommodating field wiring up to 14 AWG (1.6 mm).
• CE-Mark compliant for European industrial control equipment installation standards.
• Provides maximum output compliant voltage of 17.4 V and supports resistive loads up to 870 ohms at 20 mA.

Applications

• Driving 4-20 mA control valves, I/P converters, and variable speed drives located in Class 1 Div 1 or CENELEC Zone 0 hazardous plant areas.
• Integrating HART-enabled smart positioners and field actuators with TPS APM, HPM, and EHPM controller hardware.
• High-availability industrial process control loops requiring redundant I/O processing and galvanic signal isolation.

Technical Specifications

Connections / Interfaces

Installation Guidelines

1. Verify that the Honeywell MC-GHAO11 51309540-175 hardware part number and conformal coating rating match system engineering requirements.
2. De-energize cabinet logic power and field power before installing or removing the FTA module from the standard mounting channel.
3. Mount the Size B FTA securely into the designated cabinet FTA mounting tray using standard Honeywell mounting hardware.
4. Connect the system interface cable between the FTA and the corresponding MC-PAOY22 Analog Output Processor card file backplane connector.
5. Route field output signal cables away from high-voltage AC wiring and terminate conductors using the compression screw terminals.
6. Verify protective earthing and grounding connections in accordance with hazardous area wiring standards and OEM guidelines.

Commissioning / Replacement Recommendations

1. When replacing an existing unit, confirm that the replacement board carries the MC-GHAO11 conformal coating symbol for harsh environment protection.
2. Inspect field loop resistance to ensure the total connected load does not exceed 870 ohms per channel.
3. If HART communication filters are utilized, ensure external HART subsystem cable connections are properly seated.
4. Apply cabinet logic power and observe status LEDs on the associated MC-PAOY22 IOP to confirm normal communication and zero fault indication.
5. Perform a channel-by-channel output current verification check prior to returning the control loop to automatic operation.

Compliance and Certifications