EV-SSI/01 SSI Encoder Interface Converter Unit

Module Feature

EV-SSI/01 is dedicated isolated SSI encoder signal interface converter for absolute rotary encoder.

It receives clock and data differential SSI signal from absolute encoder, completes signal isolation, level conversion and data decoding, outputs position value to PLC or motion controller via industrial bus or parallel port. It supports configurable SSI clock rate, data bit length and Gray code / binary code format. Built-in galvanic isolation suppresses ground loop interference, suitable for long encoder cable application. It is widely stocked as maintenance spare for printing machine, metallurgy and machine tool motion control cabinet.

Working principle

Module sends synchronous clock signal to absolute encoder and reads serial SSI data stream.

Internal FPGA decodes serial Gray code or binary data into position value, isolates input and output circuit to eliminate common mode interference. Position data is buffered and transmitted to upper control system continuously. When encoder cable breaks or clock signal is lost, module triggers fault flag and alarm output to host controller.

Onboard components

Differential signal receiving circuit, signal isolation chip, FPGA decoding unit, 24VDC power regulation circuit, status indicator bank, terminal block and plastic DIN rail housing.

LED indicators

Front LEDs indicate power OK, SSI clock output, data receiving activity and signal fault alarm.

Hardware self‑diagnosis

Built-in supervision detects encoder wire open circuit, clock/data signal loss, signal amplitude abnormality and internal communication failure. Configuration and fault checking are finished by dedicated module commissioning software.

Programming softwareDedicated signal converter configuration tool, used for SSI bit length setting, code type selection, clock speed adjustment and fault log reading.

Electrical & Process Parameters

Model:EV-SSI/01 Brand:OEM Device type:SSI absolute encoder signal converter Function:SSI serial signal isolation, decoding and position data transmission for absolute encoder

Mechanical & Structure

Mounting:DIN rail cabinet mounting Protection class:IP20 Housing:Plastic insulated industrial module housing

Environmental

Operating temperature:-20℃ ~ +60℃ Storage temperature:-40℃ ~ +85℃ Ambient humidity:5~95% non‑condensing

Certification:CE Status:Original motion control instrument spare

Installation

Power off module and encoder power before replacement.

Confirm differential SSI wiring polarity, set bit length and Gray/Binary mode according to encoder specification, check communication to controller, test position reading function after commissioning.

Interface

24VDC power terminal, SSI clock/data differential terminal, position data output communication terminal.

Diagnostic

No position reading: SSI wiring reversed, wrong clock speed or encoder power missing. Jumping position data: Missing shielding, ground loop interference or cable too long. Continuous fault alarm: Encoder failure, differential channel damage or configuration bit mismatch.

Product Brief

EV-SSI/01 converter module, isolated SSI absolute encoder signal interface spare for industrial machine tool and precision motion control cabinet replacement.