Galil DMC-13X8 High Speed Position Capture The Latch Function, Command Summary Homing Operation

Command Summary - Homing Operation

COMMAND

FE XYZW

FI XYZW

HM XYZW

SC XYZW

TS XYZW

DESCRIPTION

Find Edge Routine. This routine monitors the Home Input Find Index Routine - This routine monitors the Index Input

Home Routine - This routine combines FE and FI as Described Above Stop Code

Tell Status of Switches and Inputs

Operand Summary - Homing Operation

OPERAND

_HMx

_SCx

_TSx

DESCRIPTION

Contains the value of the state of the Home Input Contains stop code

Contains status of switches and inputs

High Speed Position Capture (The Latch Function)

Often it is desirable to capture the position precisely for registration applications. The DMC-13X8 provides a position latch feature. This feature allows the position of the main or auxiliary encoders of X,Y,Z or W to be captured within 25 microseconds of an external low input signal. The general inputs 1 through 4 correspond to each axis.

1 through 4: IN1 X-axis latch IN2 Y-axis latch IN3 Z-axis latch IN4 W-axis latch

Note: To insure a position capture within 25 microseconds, the input signal must be a transition from high to low.

The DMC-13X8 software commands, AL and RL, are used to arm the latch and report the latched position. The steps to use the latch are as follows:

1.Give the AL XYZW command to arm the latch for the main encoder and ALSXSYSZSW for the auxiliary encoders.

2.Test to see if the latch has occurred (Input goes low) by using the _AL X or Y or Z or W command. Example, V1=_ALX returns the state of the X latch into V1. V1 is 1 if the latch has not occurred.

3.After the latch has occurred, read the captured position with the RL XYZW command or _RL XYZW.

Note: The latch must be re-armed after each latching event.

Example:

#Latch	Latch program
JG,5000	Jog Y

Chapter 6 Programming Motion • 104 USER MANUAL