Omega Engineering EN-EIC-325-PCI Input Signals from the Encoders, Square wave signal, General

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).

Input Signals from the Encoders

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.

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