Input Signals from the Encoders

I/O

Index input per each axis (indicating Marker/Home/Zero). The user may instruct the card to reset its counter and/or generate an "Event Signal" output upon recognizing the index input.

11 Logical Inputs. The inputs are TTL/CMOS compatible Schmidt trigger single ended. Ten of them are general inputs and one is being used for requesting a real-time counters snapshot of all four channels.

"Event Signal" opto-isolated output per each axis that may be used for Set Point, Carry (Overflow) or Index (Marker) indication + three general opto-isolated outputs. "Voltage Failure" indicator allows the user to know if there is a short-circuit between the output voltage source and the encoders (the thermal resettable fuse in the card will resume normal operation after the short is ended).

Square wave signal:

Square wave Phase A and Phase B (Sine and Cosine) shifted by 90°.

Max. input pulse rate: 500 kpps.

Signals may be either single ended or differential.

Sine wave signal:

Two incremental sinusoidal signals Phase A and Phase B (Sine and Cosine) shifted by 90°.

Max. input pulse rate: 500 kpps.

General:

Index (marker) signals may be either single ended or differential.

HTL 0.5–5V or TTL compatible.

Characteristics of the electrical signals (encoder output impedance < 1 KΩ):

Current output encoders: > ±100µA.

Voltage output encoders:

Differential: >±100mV for phases A, B (Sine and Cosine) and for the reference index (marker) pulse.

Single ended: >2V amplitude (not recommended for Sine wave signal). Excitation to the encoders: 5V DC.

Light source current: Max. 900 mA total. Protected by a polyswitch resettable fuse.