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Since its inception in 1982, Lika Electronic has continued to develop and manufacture high quality incremental and absolute, optical and magnetic, rotary and linear encoders, rotary actuators, displays, signal converters and encoder interfaces. Lika Electronic is certified ISO 9001:2000 compliant and all Lika Electronic products are CE, UL and CSA compliant and fully meet the requirements of RoHS and REACH directives.

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Seamlessly Switch Between Two SSI Encoders with IF11

POSTED 01/15/2020

IF11 Features

IF11 is designed for contactless (non mechanical), bounce-free switching between two SSI encoders and one SSI Master unit.

The switching operation is under control of a remote signal (HTL, 24 V). Moreover, there is an automatic internal synchronization to the next SSI signal pause, avoiding fragmented SSI telegrams and wrong information while commutation is in progress.

Typical applications can be found in handling and conveyor technology, where one Master unit must evaluate the signals of two independent SSI encoders for summing or differential information.  We can find applications also in drives and automation, such as automatic roll change “on the fly” or redundant systems using several encoders for safety requirements.

IF11 uses a narrow and space-saving plastic housing, suitable for DIN rail mounting (according to IEC/EN 60715). Two LEDs are mounted on the front panel for easy diagnostics.

Lika IF11 diagram


Technical Specifications    
Power supply Input voltage: 12...30 VDC
  Protection circuit: reverse polarity protection
  Ripple: ≤10 % at 24 VDC
  Consumption: approx. 50 mA (unloaded)
  Connections: screw terminals, 1.5 mm²/ AWG 16
Encoder supply Number of outputs: 2
  Output voltage: corresponds to the power supply voltage minus approx. 2 V
  Output current: 2 x 125 mA
  Protection circuit: short circuit proof
  Connections: screw terminals, 1.5 mm²/ AWG 16
SSI inputs Number of inputs: 2
  Signal levels: RS422
  Frequency range: min. 100 kHz ... max. 1 MHz
  Connections: screw terminals, 1.5 mm²/ AWG 16
Control input Signal level: HTL, 24 V
  Function: switchover for SSI encoder
  Connections: screw terminals, 1.5 mm²/ AWG 16
SSI output Number of outputs: 1
  Signal levels: RS422
  Connections: screw terminals, 1.5 mm²/ AWG 16
Processing data Delay time: output <----> input: 100 ns
  SSI interval time: min. 25 μs
  Propagation delay: -6V... + 6V
Display elements Green LED: ready for operation
  Yellow LED: switching state of the encdoer switch
Housing Material: plastic
  Mounting: 35 mm top hat rail (according to EN 60715)
  Dimensions (W x H x D): 22.5 x 121 x 112 mm
  Protection class: IP20
  Weight: approx. 100 g
Ambient Temperature Operation: 0 °C ... +45 °C / +32 ... +113 °F (not condensing)
  Storage: -25 °C ... +70 °C / -13 ... +158 °F (not condensing)