GE IP-QUADRATURE｜4‑Channel Quadrature Decoder Counter Module IndustrialPack Encoder Interface Card｜

GE IP‑QUADRATURE is a high‑performance IndustrialPack form‑factor quadrature decoder and counter module, originally manufactured by GE Intelligent Platforms (Abaco Systems).

This card provides four independent hardware quadrature decoder channels for incremental encoder signals (A/B/Z index pulse). Each channel can be configured as quadrature decoder or general‑purpose high‑speed counter. It converts encoder pulse signals into real‑time position, speed and rotation direction data for PLC, PAC and turbine control systems. It supports both differential RS‑422 and single‑ended TTL/CMOS encoder inputs, with 2.5 kV galvanic isolation between field side and backplane circuit to suppress EMI noise in heavy‑industrial environments.

Hardware specifications: 4 fully independent quadrature input channels; 24‑bit counter resolution per channel. Quadrature frequency up to 1.2 MHz; general‑purpose counting frequency up to 10 MHz. Programmable prescaler modes: X1, X2, X4 quadrature multiplication. Signal type: differential RS‑422 or single‑ended TTL/CMOS encoder signals with Z index pulse support. Galvanic isolation: 2500 VAC isolation between field wiring and system backplane. Interrupt support: per‑channel capture, match event, direction change, overflow / underflow interrupt. Backplane interface: IndustrialPack / VME64, compatible with GE PACSystems RX7i, Series 90‑70 and Mark VIe SPEEDTRONIC turbine control systems. Power supply: 5 VDC supplied via backplane; power consumption below 2 W. Operating temperature range: ‑40°C ~ +85°C; humidity 5%‑95% non‑condensing.

Typical applications: gas & steam turbine shaft speed and position monitoring, multi‑axis motion control, CNC equipment, material handling machinery, retrofitting and spare‑part maintenance for legacy GE control platforms.

Product status: Original OEM unit, manufacturer discontinued. We supply surplus new stock and fully tested used‑refurbished spare units. Warranty is available for all delivered goods. Items are ready for international shipment.

Frequently Asked Questions

Q1: What control systems is IP‑QUADRATURE compatible with?
A: It fits IndustrialPack / VME64 backplane, compatible with GE PACSystems RX7i, Series 90‑70 PLC and Mark VIe SPEEDTRONIC turbine control systems. It cannot work on other brand racks without correct hardware carrier.

Q2: What encoder signal types does this module accept?
A: It supports differential RS‑422 (5 V) and single‑ended TTL/CMOS incremental encoder signals, including A/B phase and Z index pulse for position homing. It does not work with HTL 24 V encoder signals directly.

Q3: What counting modes are supported?
A: Each channel can run as quadrature decoder (X1/X2/X4 multiplication) or general‑purpose up‑down counter. Mode is set through software configuration.

Q4: What is the maximum pulse frequency?
A: Up to 1.2 MHz under quadrature decoding mode; up to 10 MHz when used as general‑purpose counter.

Q5: Can I hot‑swap IP‑QUADRATURE while backplane is powered?
A: Hot‑swap is not supported. Power‑off the rack before inserting or removing this module to avoid hardware damage.

Q6: Is IP‑QUADRATURE still in production?
A: This module has been fully discontinued by manufacturer. We offer original surplus new stock and fully tested refurbished spare parts for legacy system maintenance.

Q7: Why counter position reading jumps or loses counts?
A: Common causes: improper grounding, missing differential termination resistor, signal noise exceeding isolation performance, input frequency exceeding module maximum rating, or encoder cable damage. Check encoder wiring and shielding first.

Q8: Does each channel support interrupt function?
A: Yes. Per‑channel hardware interrupts are available for position capture, match condition, direction change and counter overflow/underflow events.