Basler raL2048-48gm User Manual download pdf (Page 156)

Acquisition Control AW00118302000

146 Basler racer GigE

Case 3

In this case, assume that:

 We are working with a small conveyor that moves back and forth in front of a camera.

 A shaft encoder is attached to the conveyor.

 The conveyor moves in the forward direction past the camera through its complete range of

motion, stops, and then begins moving in reverse.

 The conveyor moves in the reverse direction past the camera through its complete range of

motion, stops, and then begins moving forward.

 This back an forth motion repeats.

 The conveyor occasionally "jitters". When it jitters, it moves 4 or 5 ticks in a direction of travel

opposite to the current normal direction.

For this case, the Shaft Encoder Module Mode parameter should be set to Any Direction. 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, this series of diagrams explains how the encoder software

module will act during conveyor travel:

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 156

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