FANUC QPI Series Modules

Technical Dossier

Product Details And Specifications

FANUC QPI Series: Comprehensive Module Range and Technical Overview

The FANUC QPI (Q-Series Panel Interface) series represents a mature, widely deployed family of interface and adapter modules used across heavy industrial installations globally — including petrochemical refineries, nuclear power auxiliary systems, automotive body-in-white lines, and large-scale CNC machining centers. QPI-series modules serve as the physical and electrical bridge between FANUC CNC controllers (Series 0i, 15i, 16i, 18i, 21i, 30i, 31i, 32i) and peripheral panel hardware, I/O expansion racks, and operator interface units. Their standardized backplane connector geometry and deterministic signal routing have made them a preferred choice for system integrators requiring long-term hardware consistency across multi-decade plant lifecycles.

The Evolution of QPI Series Architecture

The QPI series was introduced alongside FANUC's transition from the Series 15 to the Series 16/18 CNC platform in the early 1990s. Early modules used parallel bus architectures with fixed-pitch DIN rail mounting and relied on discrete signal lines for I/O handshaking. As FANUC migrated toward FSSB (FANUC Serial Servo Bus) and high-speed serial I/O Link architectures in the late 1990s and 2000s, QPI modules were progressively updated to support higher-bandwidth backplane communication while retaining backward-compatible connector pinouts.

The PSL (Panel Signal Link) sub-family — to which the QPI-PSL-201 belongs — was developed to address the need for large-format adapter interfaces capable of routing multiple signal groups through a single panel cutout. The "-201" suffix denotes the second-generation large-format variant with enhanced EMI shielding and revised locking tab geometry compared to the original PSL-101. Compatibility spans Series 16i/18i/21i/0i-C/0i-D/0i-F CNC systems. For installations running Series 30i/31i/32i, FANUC recommends evaluating the successor QPL and QPI-B series for new builds, though QPI-PSL-201 remains fully functional in existing installations.

QPI Series Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly stocked modules within the FANUC QPI and closely related panel interface families, grouped by functional category.

Large Adapter / Panel Signal Link Modules

• QPI-PSL-201: Large adapter module, 2nd-gen PSL, multi-signal panel routing, Series 16i/18i/0i compatible
• QPI-PSL-101: Large adapter module, 1st-gen PSL, original locking tab design, legacy installations
• QPI-PSL-202: Large adapter module, enhanced EMI shielding variant, high-noise environment rated

Standard Adapter Modules

• QPI-A20B-2101-0040: Standard QPI adapter, Series 0i-C/D interface, single-slot backplane mount
• QPI-A20B-2101-0041: Standard QPI adapter, revised firmware, Series 0i-F compatible
• QPI-A20B-2101-0050: Compact QPI adapter, reduced footprint, space-constrained panel applications

I/O Link Adapter Modules

• QPI-A02B-0323-C001: I/O Link adapter, 32-point DI/DO expansion, Series 16i/18i
• QPI-A02B-0323-C002: I/O Link adapter, 64-point DI/DO expansion, high-density I/O rack
• QPI-A02B-0323-C003: I/O Link adapter, mixed analog/digital, process interface applications

Power Interface Modules

• QPI-A16B-2202-0740: DC power interface module, 24VDC regulated output, panel bus distribution
• QPI-A16B-2202-0741: DC power interface, redundant power path, high-availability systems
• QPI-A16B-2202-0760: AC/DC power interface, universal input range, global installation compatibility

Communication & Serial Interface Modules

• QPI-A20B-8001-0940: FSSB serial interface adapter, servo axis expansion, Series 30i/31i
• QPI-A20B-8001-0941: FSSB interface, dual-port variant, multi-axis high-speed servo systems
• QPI-A20B-8001-0960: Ethernet/IP communication adapter, network-integrated CNC environments
• QPI-A20B-8001-0970: PROFIBUS-DP adapter, European automotive and process industry installations

Sourcing Hard-to-Find & Obsolete QPI Series Parts

The QPI series entered its mature/end-of-active-production phase progressively between 2010 and 2018, with FANUC officially discontinuing new manufacture of several PSL-family modules by 2020. However, installed base volumes across global heavy industry remain substantial, and demand for replacement units — particularly QPI-PSL-201, QPI-PSL-101, and the A20B-prefixed adapter variants — continues at high levels driven by plant maintenance cycles rather than new installations.

DriveKNMS maintains a dedicated inventory program for end-of-life FANUC QPI modules. Stock is sourced through controlled decommissioning of verified industrial sites, authorized surplus channels, and long-term warehousing partnerships. All units are cataloged by part number, date code, and hardware revision prior to storage. For customers operating plants with 10–30 year maintenance horizons, DriveKNMS offers forward-purchase agreements and reserved stock allocations to guarantee parts availability beyond standard market supply windows.

Quality Control for the QPI Series Range

QPI-series modules present specific test challenges due to their role as signal routing and interface bridges: a module may pass basic continuity checks while exhibiting intermittent failures under loaded backplane conditions. DriveKNMS applies a multi-stage verification protocol tailored to this series:

• Visual inspection: Connector pin geometry, locking tab integrity, PCB surface condition, capacitor inspection for electrolytic degradation
• Backplane bus simulation: Each module is seated in a live test rack replicating the target CNC backplane configuration (Series 0i/16i/18i as applicable) and subjected to full I/O Link cycle testing
• Signal integrity verification: Oscilloscope-based measurement of signal rise/fall times on all routed lines, compared against FANUC published specifications
• Thermal cycling: Modules cycled through 0°C to 55°C operational range to identify latent solder joint failures common in aged units
• Functional burn-in: 48-hour continuous operation under simulated load prior to shipment approval

All QPI modules shipped by DriveKNMS include a test report with pass/fail data for each verification stage.