Operational Characteristics:

The quadrature encoder interface accepts up to two input signals for the counting increment. The index pulse may also be considered should the control configuration require. There is also a Latch and Gate input available on the module for added functionality.

The quadrature encoder provides two signals that are shifted 90 degrees from each other, signals A and B. In order to achieve a better common mode noise rejection ratio, the output signals from the encoder are transmitted via a differential signal. Their complement signals, A(inv.) and B(inv.) are also transmitted. A directional determination may be made by which signal leads. If the A signal leads, the direction is considered to be forward. If the B signal leads, the direction is considered to be reverse. By exchanging the A and A(inv.) the phase relationship will be changed by 180 degrees, thus allowing the direction to be preset via the wiring configuration.

Most quadrature encoders have an Index signal, or Z rev, as well as the incremental signal. This signal provides one pulse per revolution with a duration equal to an incremental pulse.

The inputs to the quadrature encoder module must be supplied from an encoder with Line Driver Outputs for proper operation. The 5 Volt DC output may be used to power the encoder. The 24 Volt DC input supply must be provided from an external power supply.

The Gate and Latch inputs are 24 Volt DC.

Module Inputs and Outputs

Connection

Type

Signal A and Signal

Input,

A(inv.)

TTL

Signal B and Signal

Input,

B(inv.)

TTL

Signal C and Signal

Input,

C(inv.)

TTL

Shield

Input

Sensor 0V DC

Output

Sensor +5V DC

Output

+24V DC

Input

0V DC

Input.

Gate

Input,

 

24V DC

Latch

Input,

 

24V DC

Function

Incremental pulse signals for channel A

Incremental pulse signals for channel B

Index pulse signals

Shield connection for encoder wiring

Supply return for encoder supply

5 Volt DC supply for encoder

24 Volt DC supply, field connection

Supply return, field connection

24 Volt DC input for gate signal

24 Volt DC input for Latch signal

The Input Gate stops the counter. Only 0 V or an open connection initialize the counter. 24 V stops the counting process.

Quadrature￿￿￿￿￿￿￿￿Encoder 750-631

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Quatech INTERBUS S manual Operational Characteristics, Connection Type, Function