ELCIS X47RC8 Encoders

Technical Dossier

Product Details And Specifications

ELCIS X47RC8 Series: Comprehensive Module Range and Technical Overview

The ELCIS X47RC8 series is a line of hollow-shaft incremental rotary encoders manufactured by ELCIS S.r.l. (Italy), engineered for demanding continuous-duty applications in heavy industrial environments. These encoders are deployed across chemical processing plants, oil refineries, steel mills, paper mills, and nuclear facility auxiliary systems where shaft feedback accuracy, vibration resistance, and long-term signal integrity are non-negotiable. The X47RC8 platform uses a robust die-cast aluminum housing with IP65 protection as standard, making it suitable for environments with dust, coolant mist, and mechanical shock. The series covers resolutions from 100 to 5000 pulses per revolution (PPR), with output configurations spanning single-ended TTL, push-pull, and differential line driver (RS422) to accommodate both legacy DCS wiring schemes and modern PLC input cards. The X47RC8-500-824-B-B-CQ1-R specifically denotes: hollow bore size 8mm, 500 PPR resolution, 8–24V supply range, push-pull complementary output, and a clamping flange mounting configuration with radial cable exit.

The Evolution of X47RC8 Architecture

ELCIS introduced the X47 encoder family in the early 1990s as a successor to the I/X41 and I/X58 series, targeting the hollow-shaft segment where direct motor-shaft mounting eliminates flexible coupling assemblies. The RC8 sub-designation identifies the 8mm hollow bore variant within the X47 platform. Early production units used discrete opto-electronic sensing elements with analog signal conditioning; mid-generation revisions (circa 2000–2008) transitioned to ASIC-based interpolation circuits that improved noise immunity on long cable runs up to 100m. The output stage evolved from open-collector NPN (compatible with early Siemens S5 and Allen-Bradley PLC-2 input modules) to the current complementary push-pull and RS422 differential configurations, which interface directly with Siemens S7-300/400 FM350 counter modules, Rockwell 1756-HSC high-speed counter cards, and Mitsubishi QD62 encoder input units. The X47RC8 series is now in the mature/end-of-life phase; ELCIS has transitioned new designs to the I/X58 and I/X115 platforms. However, installed base volumes in legacy DCS environments ensure continued demand for X47RC8 spare parts through at least 2035.

X47RC8 Full Catalog & Functionalities (SKU List)

The following SKUs represent verified models within the ELCIS X47RC8 hollow-shaft incremental encoder series, organized by resolution and output configuration:

X47RC8-100-824-B-B-CQ1-R: 100 PPR, 8–24V, push-pull complementary output, radial cable, clamping flange.
X47RC8-200-824-B-B-CQ1-R: 200 PPR, 8–24V, push-pull complementary output, radial cable, clamping flange.
X47RC8-360-824-B-B-CQ1-R: 360 PPR, 8–24V, push-pull complementary output, suited for angular position in degrees.
X47RC8-500-824-B-B-CQ1-R: 500 PPR, 8–24V, push-pull complementary output, radial cable exit — current page SKU.
X47RC8-1000-824-B-B-CQ1-R: 1000 PPR, 8–24V, push-pull complementary output, standard industrial motion control.
X47RC8-1024-824-B-B-CQ1-R: 1024 PPR, 8–24V, binary-compatible resolution for digital positioning systems.
X47RC8-2000-824-B-B-CQ1-R: 2000 PPR, 8–24V, high-resolution speed feedback for variable frequency drives.
X47RC8-2500-824-B-B-CQ1-R: 2500 PPR, 8–24V, push-pull output, common in servo drive feedback loops.
X47RC8-5000-824-B-B-CQ1-R: 5000 PPR, 8–24V, maximum resolution variant for precision positioning.
X47RC8-500-524-B-B-CQ1-R: 500 PPR, 5–24V wide supply range, push-pull output, extended voltage tolerance.
X47RC8-1000-524-B-B-CQ1-R: 1000 PPR, 5–24V, push-pull complementary, compatible with 5V TTL logic systems.
X47RC8-500-824-A-B-CQ1-R: 500 PPR, 8–24V, single-ended NPN open-collector output, legacy DCS wiring.
X47RC8-1000-824-A-B-CQ1-R: 1000 PPR, 8–24V, single-ended NPN open-collector, Siemens S5 compatible.
X47RC8-500-824-B-B-CQ1-A: 500 PPR, 8–24V, push-pull complementary output, axial cable exit variant.
X47RC8-1000-824-B-B-CQ1-A: 1000 PPR, 8–24V, push-pull complementary output, axial cable exit variant.
X47RC8-500-824-D-B-CQ1-R: 500 PPR, 8–24V, RS422 differential line driver output, long-cable industrial runs.
X47RC8-1000-824-D-B-CQ1-R: 1000 PPR, 8–24V, RS422 differential output, noise-immune for 100m cable runs.

Sourcing Hard-to-Find & Obsolete X47RC8 Parts

DriveKNMS maintains a dedicated inventory program for ELCIS X47RC8 series encoders, including models that have been discontinued from the ELCIS standard production schedule. As the X47RC8 platform has entered its end-of-life phase, procurement through standard distribution channels becomes increasingly unreliable, with lead times extending to 16–26 weeks or resulting in no-quote responses. DriveKNMS sources X47RC8 units through verified secondary market channels, including decommissioned plant equipment, certified refurbishment programs, and cross-reference substitution engineering. Each unit is cross-referenced against the original ELCIS part number structure to confirm bore size, PPR, supply voltage, output type, and mechanical configuration before dispatch. For applications where an exact X47RC8 replacement is unavailable, DriveKNMS provides engineering consultation to identify compatible ELCIS I/X58 or third-party equivalents (Hengstler RI58-O, Kübler 3720, Baumer HOG 86) that match the original electrical and mechanical interface without requiring PLC parameter changes.

Quality Control for the X47RC8 Range

All X47RC8 units processed by DriveKNMS undergo a structured verification protocol before shipment. Mechanical inspection covers shaft bore concentricity, housing integrity, and cable gland seal condition. Electrical testing uses a dedicated encoder test bench that drives the hollow shaft at controlled RPM and captures the A, B, and Z channel waveforms on a digital oscilloscope. Verified parameters include: pulse count accuracy at rated PPR (±1 count tolerance over 10 full revolutions), signal rise/fall times within ELCIS specification, supply current draw within datasheet limits, and differential output symmetry for RS422 variants. Units exhibiting phase jitter, missing Z-pulse, or output voltage deviation beyond ±5% of nominal are quarantined and not dispatched. Test records are retained per unit serial number and available upon request for quality audit purposes.