User`s manual

AW00049313000 Acquisition Control
Basler runner 117
The Reverse Counter
The main purpose of the reverse counter is to compensate for mechanical "jitter" in the conveyor
used to move objects past the camera. This jitter usually manifests itself as a momentary change
in the direction of the conveyor.
The rules that govern the operation of the reverse counter are as follows:
 If the conveyor is running in the reverse direction and the current reverse counter count is less
than the maximum (i.e., less than the current setting of the Reverse Counter Max parameter),
the reverse counter will increment once for each shaft encoder reverse tick received.
 If the conveyor is running in the forward direction and the current reverse counter count is
greater than zero, the reverse counter will decrement once for each shaft encoder forward tick
received
 When the Shaft Encoder Mode is set to Forward Only:
If the reverse counter is not incrementing or decrementing, the software module will output
a trigger signal for each forward tick received from the shaft encoder.
If the reverse counter is incrementing or decrementing, trigger signal output will be
suppressed.
 When the Shaft Encoder Mode is set to Any Direction:
If the reverse counter is not incrementing or decrementing, the software module will output
a trigger signal for each forward tick or reverse tick received from the shaft encoder.
If the reverse counter is incrementing or decrementing, trigger signal output will be
suppressed.
To understand how these rules affect the operation of the encoder software module, consider the
following cases:
Case 1
This is the simplest case, i.e., the Shaft Encoder Reverse Counter Max is set to zero. In this
situation, the reverse counter never increments or decrements and it will have no effect on the
operation of the encoder software module.
When the Shaft Encoder Reverse Counter Max is set to zero:
 If the Shaft Encoder Module Mode is set to Forward Only, the software module will output a
trigger signal whenever it receives a forward tick from the shaft encoder, but not when it
receives a reverse tick.
 If the Shaft Encoder Module Mode is set to Any Direction, the software module will output a
trigger signal whenever it receives either a forward tick or a reverse tick from the shaft encoder.