Basler raL2048-48gm User Manual download pdf (Page 155)

AW00118302000 Acquisition Control

Basler racer GigE 145

Case 2

In this case, assume that:

 A shaft encoder is attached to a conveyor belt that normally moves continuously in the forward

direction past a camera.

 The conveyor occasionally "jitters" and when it jitters, it moves in reverse for 4 or 5 ticks.

For this case, the Shaft Encoder Module Mode parameter should be set to Forward Only. The Shaft

Encoder Module Reverse Counter Max should be set to a value that is higher than the jitter we

expect to see. We decide to set the value to 10.

Given this situation and these settings, the series of diagrams below explains how the encoder

software module will act:

By suppressing trigger signals when the conveyor was moving in reverse and then suppressing an

equal number of trigger signals when forward motion is resumed, we ensure that the conveyor is in

its "pre-jitter" position when the module begins generating trigger signals again.

Note in step two that if the conveyor runs in reverse for a long period and the reverse counter

reaches the max setting, the counter simply stops incrementing. If the conveyor continues in

reverse, no output triggers will be generated because the Shaft Encoder Mode is set to Forward

only.

Camera

The conveyor is moving forward and the

encoder is generating forward ticks.

Whenever the module receives a

forward tick, it outputs a trigger signal.

The reverse counter is at 0.

Forward

Camera

The conveyor jitters and moves briefly in reverse.

During this reverse movement, the shaft encoder

generates 5 reverse ticks.

The reverse counter will increment by 1 for each

reverse tick and when the reverse motion stops, the

reverse counter count will be 5.

While the reverse counter is incrementing, the output

of trigger signals from the module is suppressed.

Reverse

Camera

Forward

The conveyor resumes forward motion and the shaft

encoder module begins generating forward ticks.

The reverse counter will decrement by 1 for each

forward tick. While the reverse counter is

decrementing, the output of trigger signals from the

module is suppressed.

When the reverse counter decrements to 0,

decrementing stops and suppression of the trigger

signals stops. The module will begin outputting a

trigger signal for each forward tick received.

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Basler raL2048-48gm User Manual Page 155

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