Serviceline Industrial Sensors
Serviceline Explosion Protection

Signal Converter K23-SSI/Rx/IU-C

  • Multifunction device with operating modes for incremental rotary encoders, SSI absolute rotary encoders, and rotary encoders with start/stop interface
  • 16 bit analog output, configurable for voltage or current operations
  • USB interface and RS232/RS485 interface for configuration and readout
  • Extremely short conversion times
  • User-definable, non-linear characteristic curve with 24 interpolation points
  • Auxiliary voltage output 5 V DC and 24 V DC for rotary encoder supply
  • Numerous connection options due to six control inputs and six control outputs

Please note: All product-related documents, such as certificates, declarations of conformity, etc., which were issued prior to the conversion under the name Pepperl+Fuchs GmbH or Pepperl+Fuchs AG, also apply to Pepperl+Fuchs SE.

Download the complete datasheet as a PDF:

Datasheet excerpt: Technical data of  K23-SSI/Rx/IU-C

Product Description
SSI/analog signal converter
Indicators/operating means
LED greenstatus display
Electrical specifications
FusingExternal: T 0.5 A
Reverse polarity protection
Operating voltage18 ... 30 V DC
Operating currentapprox. 50 mA (Unladen)
SupplyEncoder: 5 VDC/24 VDC
Max. 250 mA
Interface 1
Interface typeSerial RS-232, RS-485
Transfer rate9600, 19200, or 38400 baud
Interface 2
Connection ofClock, /Clock, Data, /Data
Interface typeSSI
Managing or managed operations
Frequency rangemax. 1 MHz
Load currentmax. 3 mA / Ri > 10 kΩ / 10 pF
Resolution10 bits … 32 bits
Data formatBinary code or gray code
Interface 3
Interface typeStart/Stop
RS422 input: 1 x (Start_Stop, /Start_Stop); 1x (ext. Init_In, ext. /Init_In)
RS422 output: 1 x (Init_Out, /Init_Out)
ResolutionDepends on the speed of the encoder wave guide
FrequencyInit pulse width: 1 s … 9 µs (adjustable)
Init pulse frequency: 62.5 ... 5000 Hz (adjustable)
Time measured via pulse frequencies: 48 MHz
Input 1
Input typeIncremental
Input formatRS422, TTL, HTL differential, HTL PNP, or HTL NPN
ConnectionLanes: A, /A, B, /B
Input frequencyRS422: max. 1 MHz (RS422 differential signal > 0.5 V)
HTL differential: max. 500 kHz (HTL differential signal > 2 V)
TTL/HTL (PNP/NPN): max. 250 kHz
Load currentMax. 6 mA/Ri > 5 kΩ/10 pF
Input 2
Input type6 x Control input
Input formatHTL, PNP (low: 0 V … 3 V, high: 9 V … 30 V)
Input frequencymax. 10 kHz
Load currentMax. 2 mA/Ri > 15 kΩ/470 pF
Output 1
Number/TypeAnalog output
Configurable as Current or voltage output
Current0/4 mA … 20 mA (Max. load: 270 Ω)
Voltage-10 ... 10 V (Max. 2 mA)
Resolution16 bit
± 0.1 % at 0 °C … 45 °C
± 0.15 % at -20 °C … 0 °C und 45 °C … 60 °C
Response time< 1 ms
Output 2
Output type6 x Control output
Output formatPNP
Output voltage5 V … 30 V (Depending on voltage at COM+)
Output rated operating currentmax. 200 mA
Response time< 1 ms
Standard conformity
Electromagnetic compatibilityEN 61000-6-2, EN 61000-6-3, EN 61000-6-4, EN 61326-1
Ambient conditions
Operating temperature-20 ... 60 °C (-4 ... 140 °F) (noncondensing)
Storage temperature-25 ... 75 °C (-13 ... 167 °F) (noncondensing)
Mechanical specifications
Degree of protectionIP20
Connectionscrew terminals , Max. core cross section: 1.5 mm2 / AWG 16
Installationon 35 mm DIN mounting rail acc. to EN 60715:2001
Massapprox. 100 g
Dimensions(W x H x D) 23 mm x 102 mm x 102 mm


ECLASS 11.027210904
ECLASS 10.0.127210904
ECLASS 9.027210904
ECLASS 8.027210904
ECLASS 5.127210904
ETIM 8.0EC002918
ETIM 7.0EC002918
ETIM 6.0EC002918
ETIM 5.0EC002475
UNSPSC 12.139121007

Documents: K23-SSI/Rx/IU-C

ManualsLanguageFile TypeFile Size
Manual K23-SSI/Rx/IU-CENGPDF3181 KB
Handbuch K23-SSI/Rx/IU-CGERPDF3222 KB

Approvals+Certificates: K23-SSI/Rx/IU-C

Statements of complianceCertificate No.File TypeFile Size
EU-Declaration of conformity / EU-KonformitätserklärungDOC-4913PDF161 KB

Software: K23-SSI/Rx/IU-C

Software ToolsRelease InfoFile TypeFile Size
software tool to configure K23 devices / K23-Parametrier- und Konfigurationssoftware08/2021ZIP85353 KB

Function: K23-SSI/Rx/IU-C

The K23-SSI/Rx/IU-C is a small and inexpensive, but extremely powerful signal converter for industrial applications, where SSI telegrams from sensors or encoders are converted into an analog signal or a serial RS-232/RS-485 format.

The device is contained in a compact housing for rail mounting.

The device features

  • screw terminals

  • a USB connection

  • 6 user-configurable digital control inputs

  • 6 user-configurable digital preset outputs

Applicable encoders and sensors

Encoders and all comparable sensors with SSI interface (10 ... 32 bit binary or Gray code), either in leading mode (the device generates the clock signal itself), or in guided mode (the device switches to an existing clock signal).

Incremental input signals are processed in frequency converter mode or counter mode. In start-stop mode, transonic or magnetostrictive displacement sensors can be connected.