Seamlessly Switch Between Two SSI Encoders with IF11

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.

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)