Description
System Role and Integration
The 1X00188H01 serves as the field interface and signal conditioning layer for high-performance analog output applications within the Ovation Distributed Control System architecture. As a Personality Module (PMOD)—specifically designated as a “P-Mod Cavity Insert”—it mounts directly with the 5X00167G01 High Performance Analog Output Electronics Module (EMOD) in standard Ovation I/O bases to create a complete four-channel precision analog output solution.
This module occupies the critical boundary between the high-resolution electronics of the EMOD and the harsh electrical environment of field wiring. While the 5X00167G01 contains the 16-bit D/A converters, Fast HART modems, and microprocessor control, the 1X00188H01 supplies the precision termination resistors, individual channel fusing, surge protection, and physical connection points required to interface safely with control valves, variable speed drives, and smart field actuators.
Core Functionality and Signal Handling
The module provides four independent analog output channel terminations, each equipped to handle 4-20mA current loops into loads up to 500-700 ohms. It maintains the integrity of both the analog control signal and the superimposed HART digital communication, ensuring that the 1200 baud FSK (Frequency Shift Keying) signals pass transparently between the EMOD and HART-enabled field devices.
Individual channel protection circuits safeguard the expensive 5X00167G01 EMOD from field-side transients, short circuits, and wiring faults. The module accepts field wiring through appropriate terminal connections, providing secure termination for shielded twisted pair cables typical of 4-20mA instrument loops. The compact “cavity insert” design optimizes space utilization within the Ovation I/O base while maintaining the thermal and electrical clearance required for reliable operation.
The 1X00188H01 works in conjunction with the EMOD to support Fast HART communication, enabling rapid digital data exchange with smart valve positioners and transmitters for remote configuration, diagnostics, and secondary variable access without disturbing the primary analog control signal.
Platform Heritage and Operational Benefits
As a component of the Emerson Ovation platform originally developed by Westinghouse, the 1X00188H01 reflects the modular EMOD/PMOD architecture that maximizes application flexibility while protecting sensitive electronics. This specific personality module is uniquely matched to the 5X00167G01 High Performance Analog Output EMOD, distinguished from standard analog output modules by its support for 16-bit resolution and enhanced HART communication speeds.
The individual channel protection proves particularly valuable in process environments where field wiring faults are inevitable. If a lightning strike, excavation damage, or device failure causes a high-voltage transient on a field cable, the PMOD’s protection components sacrifice themselves to prevent damage to the high-precision D/A converters on the EMOD. This protection architecture typically results in replacement of only the inexpensive personality module rather than the complex electronics assembly, significantly reducing maintenance costs and mean time to repair (MTTR).
The compact cavity insert design—measuring approximately 8.0 cm × 4.5 cm × 2.5 cm—allows high-density packaging of analog output channels within standard Ovation enclosures, optimizing cabinet space while maintaining the channel-to-channel isolation and thermal management required for reliable 16-bit performance.
Westinghouse 1X00188H01
Part 4: Technical Specifications
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Model Number: 1X00188H01
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Manufacturer: Westinghouse Electric Corporation (Emerson Ovation product line)
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Product Type: HART High Performance Analog Output Personality Module (PMOD) / P-Mod Cavity Insert
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Compatible Electronics Module: 5X00167G01 (HART High Performance Analog Output EMOD)
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Number of Channels: 4 analog output channels
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Output Signal: 4–20 mA current loop with HART FSK superimposed
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Load Impedance Range: Up to 500–700 Ω (depending on supply voltage and cable length)
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HART Protocol: Fast HART pass-through (Bell 202 FSK, 1200 baud)
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Field Termination: Screw terminal or appropriate connector (configuration dependent)
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Channel Protection: Individual fusing and surge protection per channel
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Isolation: Maintains EMOD-provided isolation (≥500V channel-to-system)
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Operating Temperature: -40°C to +70°C (-40°F to +158°F)
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Storage Temperature: -40°C to +85°C (-40°F to +185°F)
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Humidity: 5% to 95% RH (non-condensing)
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Dimensions: Approximately 8.0 cm × 4.5 cm × 2.5 cm (3.1 in × 1.8 in × 1.0 in)
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Weight: 0.1 kg to 0.3 kg (0.2 lbs to 0.7 lbs) depending on packaging
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Mounting: P-Mod cavity insert design, installs in Ovation I/O base beneath 5X00167G01 EMOD
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Material: High-grade plastic/composite housing
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Status: Available via Emerson certified spares and secondary market
Part 5: Core Features & Customer Value
Precision 16-Bit Signal Integrity: The module maintains the integrity of the 16-bit D/A conversion provided by the 5X00167G01 EMOD, ensuring that the full precision of 65,536 discrete output levels reaches the field device without degradation. For process control engineers, this preservation of high-resolution signal quality enables tight regulatory control and minimizes process variability in critical loops such as turbine speed control or reactor pressure regulation.
Fast HART Communication Support: The personality module provides transparent pass-through for Fast HART digital signals, enabling accelerated communication cycles with smart field devices compared to standard HART modules. This allows more rapid retrieval of valve diagnostics, position feedback, and device health status—supporting predictive maintenance strategies and reducing the time required for online device verification.
Individual Channel Protection: Each of the four output channels features dedicated fusing and transient voltage suppression that protects the expensive 5X00167G01 EMOD from field-side electrical faults. For maintenance managers, this means that wiring faults or lightning strikes typically damage only the replaceable personality module rather than the precision electronics, reducing spare parts costs by 60-70% for typical field fault scenarios.
Compact Cavity Insert Design: The space-efficient P-Mod design maximizes analog output density within Ovation control cabinets, allowing high-channel-count configurations without requiring excessive enclosure real estate. This compact form factor proves particularly valuable in retrofit applications where existing cabinet space is limited and expansion must occur within existing footprints.
Modular Field Replacement: The separation of the PMOD from the EMOD enables rapid field replacement for wiring modifications or protection component replacement without disturbing the calibrated electronics or control strategy configuration. If field wiring requires retermination or surge components reach end-of-life, technicians can swap the 1X00188H01 while the 5X00167G01 retains its calibration data, minimizing process downtime and eliminating the need for post-maintenance recalibration.
Westinghouse 1X00188H01
Part 6: Typical Applications
Precision Turbine Control: The 1X00188H01 is extensively deployed in steam and gas turbine control systems paired with the 5X00167G01 EMOD to provide high-resolution analog output for fuel valve positioning, inlet guide vane control, and bleed valve modulation. In these applications, the 16-bit precision enables fine adjustments necessary for maintaining tight speed and load control within utility grid frequency regulations, while the Fast HART capability supports rapid valve position feedback for closed-loop verification.
Advanced Process Control Loops: In petrochemical refineries and chemical processing plants, the module pair controls advanced regulatory loops such as distillation column reflux, reactor feed rates, and compressor anti-surge valves. The high precision supports model predictive control (MPC) strategies requiring accurate valve positioning to maintain optimal operating points, while the individual channel protection safeguards against wiring faults in electrically classified hazardous areas.
Safety Instrumented System (SIS) Valve Control: For safety-critical applications requiring partial valve stroke testing, the Fast HART capability enables rapid verification of valve travel and response times without removing the valve from service. The high-resolution output ensures accurate positioning during safety system testing, while the HART overlay provides detailed diagnostic data required for SIL (Safety Integrity Level) verification per IEC 61511 standards.
Custody Transfer and Metering Applications: Petroleum pipeline and storage terminal facilities utilize the module pair for control of custody transfer valves and prover loop systems where measurement accuracy directly impacts revenue. The precision signal integrity ensures compliance with American Petroleum Institute (API) uncertainty requirements, while the HART communication enables retrieval of valve signatures and diagnostic data for regulatory audits and custody transfer certification.
Water Treatment Chemical Dosing: In municipal and industrial water treatment facilities, the module provides precise control of chemical metering pumps and chlorine dosing valves. The 16-bit resolution enables accurate chemical feed rates essential for maintaining water quality standards while minimizing chemical consumption costs. The wide operating temperature range accommodates outdoor installation at remote well fields and reservoir sites without climate-controlled enclosures.
