Microscan MS-96 Uživatelský manuál stáhnout pdf (Strana 57)

Chapter 4 Read Cycle

MS-9 Scanner User’s Manual 4-9

External Trigger Edge

Important: Level and Edge apply to the active logic state (Active Open or Active

Closed) that exists while the object is in a read cycle, between the rising edge and fall

ing edge. Rising edge is the trigger signal associated with the appearance of an object.

Falling edge is the trigger signal associated with the subsequent disappearance of the

object.

Usage: Highly recommended in any application where conveying speed is con-

stant or if spacing, object size, or timeouts are consistent.

Definition: External Trigger Edge, as with Level, allows the read cycle (active

state) to begin when a trigger (change of state) from an external sensing

device is received. However, the passing of an object out of sensor range

does not end the read cycle. The read cycle ends with a good read output

or, depending on End of Read Cycle setting, a timeout or new trigger

occurs.

Serial Cmd: <K200,3>

Figure 4-2 Trigger Edge

Initiate Read Cycle:

Object # 1, moving in front of the detector

beam, causes a change in the trigger state,

initiating the read cycle.

Initiate Second Read Cycle:

Object # 2, moving in front of the detector

beam, causes another change in the trigger

state. This signal initiates a new read cycle

and ends the previous read cycle unless

Timeout is enabled and a good read or tim-

eout has not occurred.

Associated waveforms assume

External Trigger State is set

to Active Closed.

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Microscan MS-96 Uživatelský manuál Strana 57