Product Overview

The GE IS220PPRFH1B is an 8-channel pulse/rate input module designed for the Speedtronic™Mark VIe distributed control system—the leading platform for turbine and rotating equipment management in power generation,oil&gas,and industrial applications.This module converts high-speed digital pulse signals from field sensors into precise frequency,speed(RPM),or flow rate data used by the Mark VIe controller for overspeed protection,load control,vibration monitoring,and performance diagnostics.

Commonly interfacing with magnetic pickups(MPUs),proximity probes,incremental encoders,and turbine flow meters,the GE IS220PPRFH1B accurately measures input frequencies from 0.1 Hz to 50 kHz,making it suitable for both slow-turn gear monitoring and high-RPM turbine shaft sensing.Each of its eight channels features independent signal conditioning,programmable trigger thresholds,and galvanic isolation up to 2500 Vrms,ensuring reliable operation in electrically noisy environments near large motors,switchgear,or variable-frequency drives.

Data from the GE IS220PPRFH1B is transmitted over dual-redundant fiber-optic I/ONET networks to Mark VIe application processors,enabling deterministic update rates(<10 ms)and seamless integration into both simplex and TMR(Triple Modular Redundant)control architectures.The module supports hot-swap in redundant configurations and is fully configurable via ToolboxST™software—eliminating manual DIP switches or potentiometer adjustments.

By providing high-fidelity speed and pulse data,the GE IS220PPRFH1B plays a critical role in safety-critical functions such as 110%overspeed trip logic,startup ramp control,and anti-motoring protection,ensuring compliance with API,ISO,and IEEE turbine standards.

Technical Specifications

Parameter Name Parameter Value

Model IS220PPRFH1B

Manufacturer General Electric(GE Power/GE Vernova)

Product Type 8-Channel Pulse/Rate Input Module

System Compatibility Speedtronic Mark VIe(Simplex&TMR)

Input Channels 8,individually isolated

Input Signal Type TTL,CMOS,or dry-contact pulses;compatible with magnetic pickups(MPUs)and proximity sensors

Frequency Range 0.1 Hz to 50 kHz per channel

Input Voltage Range-30 VDC to+30 VDC(protected against transients)

Isolation 2500 Vrms channel-to-channel and to backplane

Accuracy±0.01%of reading(typical)

Update Rate Configurable down to 5 ms

Communication Interface Dual 100 Mbps Ethernet over fiber(I/ONET protocol)

Power Supply+24 VDC via I/O pack backplane

Operating Temperature-20°C to+70°C

Mounting DIN rail(35 mm)or panel mount within Mark VIe I/O Pack

Certifications CE,UL 61010,CSA,IEC 61000-4(EMC),IEC 61508(SIL 2 capable)

Dimensions(H×W×D)Approx.180 mm×120 mm×90 mm

Main Features and Advantages

The GE IS220PPRFH1B excels in high-integrity speed measurement,a non-negotiable requirement in turbine control.Unlike generic counter modules,it includes adaptive hysteresis and noise rejection algorithms that prevent false triggering from electrical spikes or sensor chatter—common issues with aging MPUs in steam turbines.

Each channel can be independently configured for:

Pulse counting(for totalizer applications like fuel flow)

Frequency-to-RPM conversion(with user-defined pole pairs or gear teeth)

Zero-speed detection(critical for turning gear interlocks)

Direction sensing(when used with quadrature encoder inputs)

Built-in diagnostics continuously monitor for:

Open-circuit or broken-wire conditions

Signal loss or dropout

Frequency out-of-range

Internal hardware faults

All alarms are reported in real time to the Mark VIe controller and visible in ToolboxST™,enabling predictive maintenance before a sensor failure leads to a forced outage.

The module’s fiber-optic I/ONET interface eliminates ground loops and allows deployment hundreds of meters from the main I/O pack—ideal for remote gearbox or generator-end speed sensors.Its conformal-coated PCB and industrial-grade components ensure long-term reliability in high-humidity,high-vibration environments.

Application Field

The GE IS220PPRFH1B is widely used in:

Gas turbines:Monitoring compressor and power turbine shaft speeds for overspeed protection and load control

Steam turbines:Tracking HP/IP/LP rotor speeds and turning gear status

Hydro generators:Measuring rotational speed for governor feedback

Pipeline compressors:Verifying driver(aeroderivative turbine or motor)RPM and anti-surge valve position feedback

Industrial blowers&pumps:Providing speed feedback for VFD synchronization or cascade control

Flow metering:Interfacing with turbine-style flow meters in fuel or lube oil systems

It is especially critical in TMR Mark VIe systems,where three independent IS220PPRFH1B modules provide voting-capable speed inputs for fail-safe trip decisions.

Related Products

IS220PAICH1A:16-channel analog input module(for complementary sensor types)

IS220PDOAH1A:Discrete output module for trip relay actuation

VCMI/VPRO:Mark VIe controller processors that consume IS220PPRFH1B data

Mark VIe I/O Pack(e.g.,20H9995G01):Housing chassis for the module

ToolboxST™:Configuration and diagnostic software

Magnetic Pickup Units(MPUs):Common field sensors(e.g.,GE 24V4773G01)

IS200ERIOH1AAA:Remote I/O terminal for decentralized pulse acquisition

Installation and Maintenance

Pre-installation:

Use shielded,twisted-pair cables for all pulse inputs;ground shields at the I/O pack end only.

Verify sensor output voltage levels are within-30 VDC to+30 VDC range.

Ensure firmware version in ToolboxST™supports IS220PPRFH1B Rev B features.

Confirm correct terminal block adapter(e.g.,TCIH1B)is installed for field wiring.

Maintenance:

Perform functional tests during outages using a pulse generator to validate frequency accuracy and alarm thresholds.

Monitor ToolboxST™event logs for recurring“signal loss”or“frequency drift”warnings—early indicators of sensor degradation.

Inspect terminal blocks for corrosion,especially in coastal or high-humidity plants.

Keep a spare IS220PPRFH1B with matching revision on hand;store in anti-static,dry packaging.

Product Guarantee

Every GE IS220PPRFH1B we supply is brand new or professionally refurbished to original GE specifications,with full functional validation performed in a live Mark VIe test bench.We offer a 24-month warranty covering defects in materials and workmanship,backed by lifetime technical support from GE-certified automation engineers.Our commitment ensures your turbine speed sensing remains accurate,secure,and reliable—because when it comes to overspeed protection,there is no margin for error.

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